Subaru BRZ 2013 · Service Manual Interior body & electrical

Heater & air conditioner system (for automatic air conditioning system)

Parts location System information Troubleshooting Diagnostic trouble codes Circuit diagnosis Removal / installation Other

AIR CONDITIONER
HEATER & AIR CONDITIONER SYSTEM (FOR AUTOMATIC AIR CONDITIONING SYSTEM)
FUNCTION INSPECTION
1. Check of cooling performance
(1) Install the air conditioner tool set to the vehicle.
(2) Set the vehicle to the following conditions. [Preparatory Code #1]
Item
 Conditions
Vehicle body
 Vehicle parked condition in shade
Door
 Full open
A/C switch
 ON
Engine speed
 2000 r/min
FRESH/RECIRC damper position
 RECIRC position
Outlet opening damper position
 FACE
Setting temperature
 LO (MAX COLD)
Blower speed
 HI
Air conditioner inlet opening temperature *2
 30 to 35°C {86 to 95°F}
Condenser pressure (gauge high pressure side) *3
 1.47 to 1.67 MPaG (15 to 17 kgf/cm2)
NOTE:
*2···The inlet opening temperature can be judged correctly only in the range from 30 to 35°C {86 to 95°F}. If the temperature is low, postpone the test.
*3···If the condenser pressure (gauge high pressure side) is high, reduce the pressure by watering the condenser. If it is too low, increase the pressure by placing a cover over the condenser.
(3) Place a wet-and-dry-bulb thermometer (necessary for humidity) at the inlet opening and measure the temperature by inserting the bulb of the dry thermometer at the center of the outlet opening.
(4) Operate the air conditioner under the conditions in [*1] to make the outlet opening temperature stable. (About 5 to 6 minutes)
(5) Measure the dry and wet bulb temperatures at the inlet opening and the temperature at the outlet opening.
(6) Apply the measurement values of the dry/wet bulb temperatures at the inlet opening to the air diagram to obtain the relative humidity.
Captions in illustration
*a
 Dry bulb temperature (°C {°F})
 *b
 Wet bulb temperature (°C {°F})
*c
 Relative humidity (%)
 -
 -
(a) For relative humidity, when the dry bulb temperature of the wet-and-dry-bulb thermometer at the inlet opening is 25°C {77°F} and the wet bulb temperature is 19.5°C {67.1°F}, the intersection of the broken lines in the figure is the relative humidity. In this case, it is 60%.
Captions in illustration
*a
 Example
*b
 Dry bulb temperature (°C {°F})
*c
 Wet bulb temperature (°C {°F})
(7) Check the cooling performance by applying the difference of measured temperatures between the inlet opening and outlet opening and the relative humidity to the standard performance table.
Captions in illustration
*a
 Difference between inlet opening and outlet opening temperatures (°C {°F})
 *b
 Relative humidity (%)
Criteria :  The value must be within the shaded area of the diagram.
(a) To obtain the cooling performance using the standard performance table, an example when the difference of temperatures between the inlet opening and the outlet opening is 17°C {30.6°F} and the relative humidity is 60% is shown below.
Captions in illustration
*a
 Difference between inlet opening and outlet opening temperatures (°C {°F})
*b
 Relative humidity (%)
*c
 Intersection
2. Check of refrigerant gas pressure
(1) Check of refrigerant gas pressure with gauge
Captions in illustration
*a
 Gauge reading reference data
 *b
 Pressure at low pressure side MPa {kgf/cm2}
*c
 Pressure at high pressure side MPa {kgf/cm2}
 *d
 Blower HI range
*e
 Blower LO range
 -
 -
(a) Attach the air conditioner tool set.
(b) Set the vehicle to the following conditions. [Preparatory Code #2]
Item
 Conditions
Engine
 After warming-up
Door
 Full open
A/C switch
 ON
RECIRC switch
 Recirculation
Setting temperature
 LO
Blower speed
 HI
Air conditioner inlet opening temperature
 30 to 35°C {86 to 95°F}
(c) Check the gauge value in [*2].
1. At normal condition
Standard value :  0.13 to 0.20 MPa (1.3 to 2.0 kgf/cm2) (Low pressure side) :  1.47 to 1.67 MPa (15 to 17 kgf/cm2) (High pressure side)
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge at normal charge level of refrigerant gas.
2. In malfunction
·Example: During operation of the air conditioner, the pressure at the low pressure side becomes vacuum or normal.
Measurement result
Symptoms
 It becomes cold or not cold cyclically.
Cause
 Moisture in the cooling system is frozen at the cooler expansion valve. The refrigerant does not circulate temporarily. After ice is melted, normal operation is recovered.
Diagnosis
·The cooler drier is over-saturated.
·Moisture of the cooling system is frozen at the expansion valve and it blocks circulation of the refrigerant gas.
Corrective action
·Replace the cooler dryer.
·Remove moisture in the cycle by repeating air release.
·Inject appropriate level of new refrigerant gas.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge condition of moisture inclusion in the cooling system.
·Example: Both high and low pressure sides are low.
Measurement result
Symptoms
·Poor cooling performance
·Cooling performance is not sufficient.
Cause
 A part of the cooling system has gas leak.
Diagnosis
·Refrigerant gas is insufficient.
·Leak of refrigerant gas
Corrective action
·Check for gas leak. Repair it if necessary.
·Inject appropriate level of new refrigerant gas.
·If the pressure value is close to 0 when connected to the gauge, check for the leak area. After repair, perform vacuuming.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge condition of poor cooling.
·Example: The pressures at both low and high pressure sides are low and the pipe connected from the cooler condenser ASSY to the air conditioner unit has condensation.
Measurement result
Symptoms
 Poor cooling performance
Cause
 Dust in the cooler condenser core blocks flow of refrigerant.
Diagnosis
 Clogged cooler condenser core
Corrective action
 Replace the cooler condenser ASSY.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge condition of poor refrigerant gas performance.
·Example: Pressures at both low and high pressure sides are low and the pipe before and after the cooler condenser core and the cooler expansion valve has fogging or condensation.
Measurement result
Symptoms
 Poor cooling (it may work in cases)
Cause
·Flow of the refrigerant gas is blocked by moisture or dust of the cooling system.
·Flow of the refrigerant gas is blocked by leak of the refrigerant gas from the cooler expansion valve.
Diagnosis
 Refrigerant gas does not circulate.
Corrective action
·Check the cooler expansion valve.
·Remove dust in the cooler expansion valve with an air gun.
·Replace the cooler condenser ASSY.
·After vacuuming, inject new refrigerant gas to the appropriate level.
·If leak of the refrigerant gas from the cooler expansion valve is found, replace the cooler expansion valve.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge for no circulation of the refrigerant gas.
·Example: Both high and low pressure sides are too high.
Measurement result
Symptoms
 Poor cooling performance
Cause
·Flow of the refrigerant gas is blocked by moisture or dust of the cooling system.
·Flow of the refrigerant gas is blocked by leak of the refrigerant gas from the cooler expansion valve.
Diagnosis
·Excessive refrigerant
·Cooling of the cooler condenser core is insufficient.
Corrective action
·Clean the cooler condenser core fin.
·Check operation of the cooling fan.
·Check the refrigerant level and inject the refrigerant to the appropriate level.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge condition of excess refrigerant gas or insufficient cooling of the cooler condenser core.
·Example: Pressures at both low and high pressure sides are high and the low pressure pipe is too hot to be touched.
Measurement result
Symptoms
 Air conditioner does not function.
Cause
 Air inside the cooling system
Diagnosis
·Air is included inside the cooling system.
·Insufficient vacuuming
Corrective action
·Check if the compressor oil is contaminated or insufficient.
·After vacuuming, inject new refrigerant gas.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
·Caution: The gauge indicates a value when the cooling system is opened without vacuuming for injection of the refrigerant.
·The illustration indicates the gauge condition of air inclusion in the cooling system.
·Example: Pressures at both low and high pressure sides are high and the low pressure side has fogging or condensation.
Measurement result
Symptoms
 Poor cooling performance
Cause
 Problems on cooler expansion valve
Diagnosis
·Excessive refrigerant of low pressure pipe
·Excessive opening of cooler expansion valve
Corrective action
 Replace the cooler expansion valve.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge of improper cooler expansion valve.
·Example: Pressure at the low pressure side is high and pressure at the high pressure side is low.
Measurement result
Symptoms
 Air conditioner does not function.
Cause
 Compression leak in cooler compressor ASSY
Diagnosis
·Poor compression
·Leak from valve or damage to sliding part
Corrective action
 Repair or replace the cooler compressor ASSY.
Captions in illustration
*a
 Low pressure side
*b
 High pressure side
NOTE:
The illustration indicates the gauge of poor compression of the cooler compressor ASSY.
3. Cooler condenser ASSY
(1) If the cooler condenser ASSY fin is contaminated, clean it with water and dry it with compressor air.
CAUTION:
Do not damage the fin of the cooler condenser ASSY.
(2) If the fin of the cooler condenser ASSY is bent, correct the fin straight with a screwdriver or pliers.
4. Check for refrigerant gas leak
(1) Using a halogen leak detector, check the pipe joints for leaks.
(2) If gas leak is found at joints of pipes, check the torque at the joints.
PARTS LOCATION
LIST OF DIAGNOSTIC CODES
Diagnostic codes
 Diagnostic items
 Code memory (SSM3)
 Code memory (panel)
 Reference pages
B1430/21
 [Room temperature sensor circuit wire break]
 O
 O
  
B1431/-21
 [Room temperature sensor circuit short-circuit]
 O
 O
  
B1432/22
 [Ambient temperature sensor circuit wire break]
 O
 -
  
B1433/-22
 [Ambient temperature sensor circuit short-circuit]
 O
 -
  
B1434/23
 [Evaporator sensor circuit wire break]
 O
 O
  
B1435/-23
 [Evaporator sensor circuit short-circuit]
 O
 O
  
B1436/45
 [Air mix door actuator potentiometer circuit wire break (passenger’s seat)]
 O
 O
  
B1437/-45
 [Air mix door actuator potentiometer circuit short-circuit (passenger’s seat)]
 O
 O
  
B1438/49
 [Mode Door Actuator Potentiometer Circuit Open]
 O
 O
  
B1439/-49
 [Mode Door Actuator Potentiometer Circuit Short]
 O
 O
  
B1440/41
 [Air mix door actuator potentiometer circuit wire break (driver’s seat)]
 O
 O
  
B1441/E45
 [Air mix door actuator lock (passenger’s seat)]
 O
 O
  
B1442/-41
 [Air mix door actuator potentiometer circuit short-circuit (driver’s seat)]
 O
 O
  
B1443/E49
 [Mode Door Actuator Lock]
 O
 O
  
B1446/E41
 [Air mix door actuator lock (driver’s seat)]
 O
 O
  
B14A1/25
 [Sunload Sensor Circuit Open]
 -
 -
  
B14A2/-25
 [Sunload Sensor Circuit Short]
 O
 O
  
E24
 [Engine Coolant Temp. Sensor Abnormal/Incorrect Communication]
 -
 -
  
U0073/E72
 [CAN Communication Error]
 O
 -
  
U0100
 [Lost Communication With ECM/PCM “A”]
 O
 -
  
U0101
 [Lost Communication With TCM]
 O
 -
  
U0122
 [Lost Communication With Vehicle Dynamics Control Module]
 O
 -
  
U0140
 [Lost Communication With Body Control Module]
 O
 -
  
U0155
 [Nonarrival of H-CAN data(METER)]
 O
 -
  
U0401
 [Lost Communication With ECM/PCM “A”]
 O
 -
  
U0402
 [Lost Communication With TCM]
 O
 -
  
U0416
 [Lost Communication With Vehicle Dynamics Control Module]
 O
 -
  
U0422
 [Lost Communication With Body Control Module]
 O
 -
  
U0423
 [Nonarrival of H-CAN data(METER)]
 O
 -
  
E73
 [CAN Communication Error]
 -
 -
 -
SYMPTOM TABLE
Symptoms
 Inspection items
 Reference pages
A/C system does not operate at all.
 Wire harness and connector (grounding and power supply system)
 -
Fuse [MPX-B, HEATER, HEATER]
  
Air conditioner control ASSY
  
CAN communication system
  
Switch operation is not accepted.
 Air conditioner control ASSY
  
Wire harness and connector
 -
Blower motor (with fan) does not rotate.
 Blower motor circuit
  
Air conditioner control ASSY
  
Blower register (power transistor)
 -
 Blower motor (with fan) speed does not change.
 
 Blower motor circuit
  
Air conditioner control ASSY
  
Blower register (power transistor)
 -
Difficult cooling
 Check of refrigerant level
  
Check of refrigerant pressure
  
Cooler expansion valve
  
Compressor ASSY (with magnet clutch)
  
Air conditioner control ASSY
  
Cold air not emitted
 Check of refrigerant level
  
Check of refrigerant pressure
  
Air conditioner pressure switch
  
Compressor ASSY (with magnet clutch)
  
Air mix damper servo circuit (driver’s seat)
  
Air mix damper servo circuit (passenger’s seat)
  
Cooler thermistor (in-vehicle sensor)
  
Automatic light control sensor
  
Thermistor ASSY
  
Cooler thermistor NO.1 (after-evaporator sensor)
  
Cooler expansion valve
  
CAN communication system
  
Air conditioner control ASSY
  
Wire harness and connector
 -
Heater relay (clutch relay)
  
Aspirator hose
  
Warm air not emitted
 Air mix damper servo circuit (driver’s seat)
  
Air mix damper servo circuit (passenger’s seat)
  
Cooler thermistor (in-vehicle sensor)
  
Automatic light control sensor
  
Thermistor ASSY
  
CAN communication system
  
Air conditioner control ASSY
  
Wire harness and connector
 -
Aspirator hose
  
Warmer or colder than setting temperature
 Check of refrigerant level
  
Check of refrigerant pressure
  
Air mix damper servo circuit (driver’s seat)
  
Air mix damper servo circuit (passenger’s seat)
  
Cooler thermistor (in-vehicle sensor)
  
Air inlet at the front of the cooler thermistor (in-vehicle sensor) (clogged dust or foreign matter)
 -
Automatic light control sensor
  
Thermistor ASSY
  
Cooler expansion valve
  
Radiator heater unit
 -
Wire harness and connector
 -
CAN communication system
  
Air conditioner control ASSY
  
Heater relay (clutch relay)
  
Aspirator hose
  
Temperature control is disabled (temperature does not change).
 Air mix damper servo circuit (driver’s seat)
  
Air mix damper servo circuit (passenger’s seat)
  
Wire harness and connector
 -
Air conditioner control ASSY
  
Aspirator hose
  
 Temperature control is disabled (MAX HOT or MAX COLD occurs).
 
 Cooler thermistor (in-vehicle sensor)
  
Thermistor ASSY
  
Wire harness and connector
 -
CAN communication system
  
Air conditioner control ASSY
  
Aspirator hose
  
Inlet opening is not changed.
 Air conditioner control ASSY
  
Wire harness and connector
 -
Damper servo (FRESH/RECIRC)
  
Indicator does not illuminate.
 Air conditioner control ASSY
  
Wire harness and connector
 -
Diagnostic code is not written (At IG ON, the set mode is erased).
 Air conditioner control ASSY
  
Outlet opening is not changed.
 Damper servo (mode change)
  
Air conditioner control ASSY
  
Wire harness and connector
 -
Illumination does not turn on, or does not dim.
 Air conditioner control ASSY
  
Wire harness and connector
 -
HOW TO TROUBLESHOOT
1. Bring in the car


Next▼

2. Interview and phenomenon check

(1) Interview and phenomenon check (Refer to )

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3. Basic inspection

(1) Measure the battery voltage.
Voltage :  10 to 16 V
(2) According to the parts arrangement drawing and/or circuit figure, check the blown fuse, broken wire harness, short circuit, and/or improper connection that can be inspected visually.

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4. Inspection of CAN communication system

(1) Check CAN communication system. (Refer to )
Result
Result
 Go to
Functioning properly
 A
Not functioning properly
 B
B
>CAN communication system (To )

A▼

5. Diagnostic code check by SSM3 or sensor check code check by panel diagnosis

(1) Diagnostic code or sensor check code check (Refer to )
(a) Record the diagnostic code or sensor check code.
(2) Clear the diagnostic code or sensor check code.
(3) Recheck the diagnostic code or sensor check code.
(a) Reproduce a malfunction based on the recorded diagnostic code or sensor check code. Check if the diagnostic code is output again.
NOTE:
When the diagnostic code or sensor check code is output, refer to the “list of diagnostic codes” ().
Result
Result
 Go to
No code, can check and reproduce phenomenon
 A
Code is output
 B
No code, can't check and reproduce phenomenon
 C
B
>Go to Step 8.
C
>To malfunction simulation ()

A▼

6. Symptom table

(1) Symptom table (Refer to )
Result
Result
 Go to
Not applicable to the symptom table.
 A
Applicable to the symptom table.
 B
B
>Go to Step 8.

A▼

7. Perform troubleshooting with the method below based on malfunctions.

(1) [Current Data Display & Save] / [System Operation Check Mode] (Refer to )
(a) [Current Data Display & Save] (SSM3)
(b) [System Operation Check Mode] (SSM3)
(2) Diagnostic system (Refer to )
(a) Check with panel diagnosis (indicator check)
(3) ECM terminal matrix (Refer to )
(4) After inspection of the wire harness and connector, perform the diagnosis check again. (Refer to )

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8. Adjustment, repair, or replacement


Next▼

9. Confirmation test


Next▼
Complete

CHECK LIST FOR INTERVIEW
CHECKING / CLEARING DIAGNOSTIC CODES
1. Checking diagnostic codes (read from the SSM3)
(1) With IG OFF, connect SSM3 to DLC3.
(2) Turn the ignition switch to ON.
(3) According to the screen of SSM3, select [Each System Check] → [Air Condition System] → [Diagnostic Code(s) Display].
(4) Check the diagnostic codes.
2. Clearing diagnostic code records (Cleared by the SSM3)
(1) With IG OFF, connect SSM3 to DLC3.
(2) Turn the ignition switch to ON.
(3) According to the screen of SSM3, select [Each System Check] → [Air Condition System] → [Clear Memory].
(4) Select [Deletion] on the screen to clear the data.
DIAGNOSIS SYSTEM
1. Check with panel diagnosis (indicator check)
NOTE:
The panel described below are for the RHD model.
(1) Turn the ignition switch to OFF.
(2) While pressing AUTO and FRESH/RECIRC switch at the same time, turn IG ON from OFF. Hold both switches until the panel diagnosis mode appears.
(3) Confirm that all indicators and setting displays repeat ON and OFF 4 times at intervals of 1 second.
NOTE:
After the end of the indicator check, sensor check is automatically performed.
Captions in illustration
*a
 Blinking indicator
 *b
 ON
*c
 OFF
 *d
 1 second
(4) To end the panel diagnosis, press the “OFF” switch.
2. Check with panel diagnosis (sensor check)
NOTE:
The panel described below are for the RHD model.
(1) Perform the indicator check.
NOTE:
After the end of the indicator check, sensor check is automatically performed.
(2) Confirm the sensor check result displayed at the temperature display.
Result
Check result
 Code display
Current malfunction
 Blink
NOTE:
·The illustration shows output of code “21”.
·If there are 2 or more error codes, they are displayed in the order of smaller code number.
(3) If there are 2 or more error codes and it is difficult to read them, press the “A/C” switch to fix the code (step operation) for reading.
NOTE:
“Items can be displayed in phase each time the “A/C” switch is pressed.
(4) If an error code is output, find the code from the list of diagnostic codes. (Refer to )
(5) To end the panel diagnosis, press the “OFF” switch.
3. Check with panel diagnosis (actuator check)
(1) Start the engine and warm up completely.
(2) Perform the indicator check.
Captions in illustration
*a
 Blinking indicator
*b
 ON
*c
 OFF
*d
 1 second
(3) After indicator check → sensor check, press the “DEF” switch to perform the actuator check.
NOTE:
Be sure to perform the actuator check with the engine started.
(4) Actuator check (continuous) is repeated in the order of steps 0 → 8 at intervals of 1 second. Check the temperature and air flow with eyes and hand.
NOTE:
The step number is displayed at the driver’s seat side setting temperature display.
(5) If it is difficult to perform inspection due to the steps changing, press the “A/C” switch to fix the step (step operation) for inspection.“The steps change each time the “A/C” switch is pressed.
(6) To end the panel diagnosis, press the “OFF” switch.
NOTE:
When the “AUTO” switch is pressed, the sensor check mode appears.
Actuator check table
Step No.
 Contents
Display
 Blower
 Mode
 RECIRC/FRESH
 A/C
 A/M damper
1
 81
 Lo
 FACE
 FRS
 OFF
 0%
2
 82
 REC
 ON
3
 83
 M1
4
 84
 B/L
 FRS
 50%
5
 85
 FOOT
6
 86
 M3
 100%
7
 87
 F/D
8
 88
 Hi
 DEF
CUSTOMIZE FUNCTION
1. Heater & air conditioner system customizing
(1) Customize using the SSM3
(a) Connect the SSM3 to the DLC3.
(b) Turn the ignition switch to ON.
(c) According to the screen of SSM3, select [Each System Check] → [Air Condition System] → [Unit customizing] for customizing.
Display Name
 Initial setting valve
 Contents
 Setting
 Control ECM
[Intake port auto mode]
 AUTO
 Sets control function which automatically allows Control ASSY to decide the inlet opening when the auto mode is started or allows user to select.
 AUTO/User Select
 Air conditioner control ASSY
[Compressor auto mode]
 AUTO
 Sets control function which automatically allows Control Assy to decide the A/C compressor operation when the auto mode is started or allows user to select.
 AUTO/User Select
 Air conditioner control ASSY
[Compressor Intake port (PSW, lock) linkage]
 With interlock
 Sets control function which changes the inlet opening to FRESH when the pressure SW detects a problem or allows user to select.
 With interlock/User select
 Air conditioner control ASSY
[Foot/DEF Automatic Fan Speed increase Function]
 Allows increase
 Sets control function which automatically increases the air flow when DEF mode is selected by the User or allows user to select.
 Allows increase/User Select
 Air conditioner control ASSY
[FOOT/DEF auto mode]
 AUTO
 Sets control function which selects FOOT/DEF outlet opening when the auto mode is started or user selects.
 AUTO/MANUAL
 Air conditioner control ASSY
[Setting temperature shift]
 Display and actual setting are the same
 Sets control function to allow temperature display to vary from the actual setting
 Variance of-3/-2/-1/0/1/2/3 is adjustable
 Air conditioner control ASSY
CIRCUIT FIGURE
ECM TERMINAL ARRANGEMENT
1. Air conditioner control ASSY
Standard value
Connector D19
Terminal No. (Terminal symbol)
 Input/Output
 Item
 Measuring conditions
 Standard value
D19-1 (ACC)←→D19-16 (GND)
 Input
 Voltage
 IG ACC
 10 to 16 V
D19-2(PSW)←→D19-6 (SG)
 Input
 Waveform
 When refrigerant pressure is normal
 10 to 16 V
When refrigerant pressure is abnormal
 Less than 1 V
D19-6 (SG) ←→ Chassis ground
 -
 Resistance
 Always
 Less than 1 Ω
D19-8 (HR)←→D19-16 (GND)
 Input
 Voltage
 IG ON
Blower switch OFF → LO
 Less than 1 V → 10 to 16 V
D19-9 (+B)←→D19-16 (GND)
 Input
 Voltage
 Always
 10 to 16 V
D19-10 (IG)←→D19-16 (GND)
 Input
 Voltage
 IG ON
 10 to 16 V
D19-11 (ILL+)←→D19-16 (GND)
 Input
 Voltage
 Night illumination ON
 10 to 16 V
Night illumination OFF
 Less than 1 V
D19-12 (CANL)←→D19-16 (GND)
 Input/Output
 Waveform
 IG ON
 Pulse generation
D19-13 (CANH)←→D19-16 (GND)
 Input/Output
 Waveform
 IG ON
 Pulse generation
D19-14 (BLW)←→D19-16 (GND)
 Output
 Waveform
 IG ON
Blower switch LO
 Pulse generation (waveform 1)
D19-15 (ILL-)←→D19-16 (GND)
 Input
 -
 IG ON
Rheostat
 10 to 16 V
D19-16 (GND) ←→ Chassis ground
 -
 Resistance
 Always
 Less than 1 Ω
Connector D20
Terminal No. (Terminal symbol)
 Input/Output
 Item
 Measuring conditions
 Standard value
D20-2 (CLTS) ←→ Chassis ground
 Input
 Voltage
 IG ON
Put sunlight or light to the sunload sensor.
 0.8 to 4.3 V
(The voltage varies depending on the light strength.)
D20-29 (S5)←→16 (GND)
 Output
 Voltage
 IG ON
 4.75 V to 5.25 V
(1) Waveform 1
Item
 Contents
Measuring terminal
 F42-22 (BLW) - F42-14 (GND)
Equipment setting
 1 V/DIV, 500 µs/DIV
Measuring conditions
 IG ON, Blower switch: LO, A/C switch: ON
NOTE:
As the blower level is high (increase of air flow), the duty ratio is changed.
2. Combination meter ASSY
Standard value
Connector D7
Terminal No. (Terminal symbol)
 Input/Output
 Item
 Measuring conditions
 Standard value
D7-24 (TAM) ←→ D7-25 (SG-)
 Input
 Voltage
 IG ON
External temperature 25°C (77°F)
 1.4 to 1.6 V
IG ON
External temperature 50°C (122°F)
 0.7 to 0.9 V
D7-6 (CANH) ←→ Chassis ground
 Input/Output
 Waveform
 IG ON
 Pulse generation
D7-7 (CANL) ←→ Chassis ground
 Input/Output
 Waveform
 IG ON
 Pulse generation
3. Instrument panel junction block ASSY, main body ECM (Network gateway computer)
Instructions in illustration
*1
 Instrument panel junction block ASSY
 *2
 Main body ECM (Network gateway computer)
(1) Inspection of instrument panel junction block ASSY and main body ECM (network gateway computer)
(a) Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
(b) Check the resistance and voltage between the instrument panel junction block ASSY connector terminals.
Standard value
Connector MB
Terminal No. (Terminal symbol)
 Input/Output
 Item
 Measuring conditions
 Standard value
MB8 ←→ Chassis ground
 Input
 Voltage
 IG ON
 11 to 14 V
MB9 ←→ Chassis ground
 Input
 Voltage
 IG ACC
 11 to 14 V
MB11 ←→ Chassis ground
 -
 Resistance
 Always
 Less than 1 Ω
NOTE:
If it is out of the standard value, it can be judged as malfunction of the vehicle.
4. Engine control computer
Standard value
Connector A33
Terminal No. (Terminal symbol)
 Input/Output
 Item
 Measuring conditions
 Standard value
A33-8 (ACP) ←→ Chassis ground
 Input
 Voltage
 When refrigerant pressure is normal
 0.63 to 4.73 V
A33-18 (CANL) ←→ Chassis ground
 Input/Output
 Waveform
 IG ON
 Pulse generation
A33-19 (CANH) ←→ Chassis ground
 Input/Output
 Waveform
 IG ON
 Pulse generation
CURRENT DATA DISPLAY & SAVE / SYSTEM OPERATION CHECK MODE
1. ECM data monitor (SSM3)
(1) Using SSM3, display the [Current Data Display & Save] screen. Check the computer data.
SSM3 screen: [Each System Check] → [Air Condition System] → [Current Data Display & Save]
Item Name
 Description/display range
 Normal value
 Remarks
[In-vehicle Sensor Temperature]
 Vehicle compartment temperature is displayed.
Display range: -72.47 to 193.82°C {-98.4 to 380.9°F}
 Default value is displayed for open or short-circuit.
[SSM3] (25°C {77°F}) is displayed.
 Cooler thermistor (in-vehicle sensor) system
[Quantity of Sunload]
 Light strength at the sunload sensor is displayed.
Display range: 0 to 4448 W/m2
 In the range from 0 to 4448, it is increased for brighter light (the value according to sunload is displayed).
·Default value is displayed for open circuit, no sunload or short-circuit: (0) is displayed.
 Automatic light control sensor system
[A/C Pressure Switch]
 Refrigerant pressure is displayed.
Display range: Normal - Abnormal
 Refrigerant pressure status is displayed.
 Compressor ASSY operation
Refrigerant level
Refrigerant leak
Pressure switch system
[Heater Water Temperature]
 Driver’s seat side setting temperature is displayed.
Display range: -40.00 to 215.00°C {-40.00 to 419.00°F}
 In the range from -40.00 to 215.00°C {-40.00 to 419.00°F}, the engine coolant temperature is displayed.
 Engine is warmed.
E.F.I. water temperature (coolant temperature sensor) system
CAN communication system
[Heater Control Panel Setting Value (Driver’s)]
 Driver’s seat side setting temperature is displayed.
Display range: 15.00 to 90.00°C {59.00 to 194.00°F}
 The same value as the setting temperature display is displayed.
 When the driver’s seat side setting temperature dial is operated
Control panel system
[Heater Control Panel Setting Value (Passenger’s)]
 Passenger’s seat side setting temperature is displayed.
Display range: 15.00 to 90.00°C {59.00 to 194.00°F}
 The same value as the setting temperature display is displayed.
 When the passenger’s seat side setting temperature dial is operated
Control panel system
[Blower outlet request temperature (Driver’s)]
 Target temperature of the driver’s seat side outlet opening is displayed.
Display range: -327.68 to 327.67°C {-557.82 to 621.80°F}
·In MAX COLD: -327.68°C {-557.82°F} is displayed.
·In MAX HOT: 327.67°C {621.80°F} is displayed.
 -
[Blower outlet request temperature (Passenger’s)]
 Target temperature of the passenger’s seat side outlet opening is displayed.
Display range: -327.68 to 327.67°C {-557.82 to 621.80°F}
·In MAX COLD: -327.68°C {-557.82°F} is displayed.
·In MAX HOT: 327.67°C {621.80°F} is displayed.
 -
[Air mix door actuator position (driver’s side)]
 Actual position information of the driver’s seat side air mix damper is displayed.
Display range: -32.68 to 133.33 %
 The target opening is followed.
 Air mix damper servo system
[Air mix door actuator position (passenger’s side)]
 Actual position information of the passenger’s seat side air mix damper is displayed.
Display range: -32.68 to 133.33 %
 The target opening is followed.
 Air mix damper servo system
[Mode Door Actuator Position]
 Actual position information of the mode damper is displayed.
Display range: -32.68 to 133.33 %
 The target opening is followed.
 Mode damper servo system
[Fresh/Recircle Air Door Actuator Position]
 Actual position information of the FRESH/RECIRC damper is displayed.
Display range: 0 to 100 %
 The target FRESH/RECIRC position is followed.
·In REC: 0 %
·In FRS: 100 %
 Damper servo (FRESH/RECIRC) system
[Target air mix door actuator position (driver’s side)]
 Actual position information of the driver’s seat side air mix damper is displayed.
Display range: -32.68 to 133.33 %
·In MAX COOL: -10 is displayed.
·In MAX HOT: 100 is displayed.
 Air mix damper servo system
[Target air mix door actuator position (passenger’s side)]
 Actual position information of the passenger’s seat side air mix damper is displayed.
Display range: -32.68 to 133.33 %
·In MAX COOL: 0 is displayed.
·In MAX HOT: 110 is displayed.
 Air mix damper servo system
[Mode Door Actuator Position Target]
 Actual position information of the mode damper is displayed.
Display range: -32.68 to 133.33 %
·In FACE: -16.7
·In B/L: 10
·In FOOT: 70
·In FOOT/DEF: 90
·In DEF: 116.7
 In operation of the outlet opening switch
Mode damper servo system
[Fresh/Recircle Air Door Actuator Position Target]
 Position information of the FRESH/RECIRC damper is displayed.
Display range: REC - FRS
·In REC: REC
·In FRS: FRS
 In operation of the FRESH/RECIRC switch
Damper servo (FRESH/RECIRC) system
[Blower Fan Level]
 The revolution level of the blower fan motor is displayed.
Display range: 0 to 31
 When the revolution is increased, the value goes up in the range from 0 to 31.
·In Min: 0 is displayed.
·In Max: 31 is displayed.
 Blower fan system
[Ambient Air Temperature]
 Ambient air temperature is displayed.
Display range: -40.00 to 80.00°C {-40.00 to 176.00°F}
 Value immediately before or default value (15.2°C {59.4°F}) is displayed when there is open or short-circuit.
 Cooler thermistor (ambient sensor) system
[Compressor operation status]
 Compressor ASSY
Display range: OFF - ON
·In compressor OFF: OFF
·In compressor ON: ON
 Compressor ASSY operation
[Blower Fan Operating Condition]
 Operation mode (manual/auto) of the blower fan is displayed.
Display range: Manual - Auto
·In manual: Manual
·In Auto: Auto
 -
[A/C Operating Condition]
 Operation mode (manual/auto) of the compressor is displayed.
Display range: Manual - Auto
·In manual: Manual
·In Auto: Auto
 Engine control computer system
[Fresh/Recircle Air Operating Condition]
 Operation mode (manual/auto) of FRESH/RECIRC is displayed.
Display range: Manual - Auto
·In manual: Manual
·In Auto: Auto
 In operation of the FRESH/RECIRC switch
Damper servo (FRESH/RECIRC) system
[Mode Operating Condition]
 Operation mode (manual/auto) of the outlet opening is displayed.
Display range: Manual - Auto
·In manual: Manual
·In Auto: Auto
 Mode damper servo system
[Rear Defogger]
 Rear defogger switch status is displayed.
Display range: OFF - ON
·Switch OFF: OFF
·Switch ON: ON
 -
[Engine Speed]
 Display range: 0 to 32767
 In the range from 0 to 32767, the engine speed is displayed.
 -
[Vehicle Speed]
 Display range: 0.00 to 300.00
 In the range from 0.00 to 300.00, the vehicle speed is displayed.
 -
[Evaporator Temperature]
 Evaporator ambient temperature is displayed.
Display range: -82.48 to 153.55°C {-116.46 to 308.39°F}
·In open circuit: (-82.48°C {-116.46°F}) is displayed.
·In short-circuit: (153.55°C {308.39°F}) is displayed.
 Cooler thermistor NO.1 (after-evaporator sensor) system
[Evaporator Temperature Target]
 Cooler thermistor NO.1 (after-evaporator sensor) target temperature is displayed (target value of ECM).
Display range: 0.00 to 20.00°C {32.00 to 68.00°F}
 In the range from 0.00 to 20.00, the target after-evaporator temperature is displayed.
 Cooler thermistor NO.1 (after-evaporator sensor) system
[Intake port auto mode]
 Set value of initial RECIRC is displayed.
Display range: Manual - Auto
·In manual: Manual
·In Auto: Auto
 Customize setting
[Compressor auto mode]
 Set value of compressor Auto is displayed.
Display range: Without interlock - With interlock
·In manual: Manual
·In Auto: Auto
 Customize setting
[Intake port (PSW, lock) linkage]
 Set value of inlet opening (PSW/lock) interlock is displayed.
Display range: Without interlock - With interlock
·Without interlock: No interlock
·With interlock: Interlock
 Customize setting
[Foot/DEF Automatic Blow Up Function]
 Set value of air flow increase in DEF is displayed.
Display range: Without increase - With increase
·Without increase: No increase
·With increase: Increase
 Customize setting
[FOOT/DEF auto mode]
 Set value of FOOT/DEF interlock is displayed.
Display range: Manual - Auto
·In manual: Manual
·In Auto: Auto
 Customize setting
[Setting temperature shift]
 Setting temperature shift value is displayed.
Display range: -3 to +3°C
 Setting temperature shift is displayed.
 Customize setting
[Number of Diagnostic Code(s):]
 Display range: 0 to 255
 Number of diagnostic codes output is displayed.
 -
SSM3 display: [Each System Check] → [Engine Control System] → [Current Data Display & Save]
Item Name
 Description/display range
 Normal value
 Remarks
[A/C Magnetic Clutch Relay]
 Air conditioner switch status is displayed.
Display: ON - OFF
 ON: Air conditioner ON
OFF: Air conditioner OFF
 The air conditioner signal system may have an error, if any.
2. System Operation Check Mode
(1) Using SSM3, display the [System Operation Check Mode] screen according to the screen and perform the system operation check mode.
SSM3 screen: [Each System Check] → [Air Condition System] → [Work Support] → [System Operation Check Mode]
Item Name
 Drive
[Blower Fan Level Setting]
 Blower motor operation
Operate in the range from 0 to 31 (Level).
[Air mix door actuator target open (driver’s side)]
 Operation of driver’s seat side air mix damper servo
Operate in the range from -10 to 100.00.
CAUTION:
Operation exceeding this range may result in a malfunction.
Perform the system operation check mode within this range.
[Air mix door actuator target open (passenger’s side)]
 Operation of passenger’s seat side air mix damper servo
Operate in the range from 0 to 110.00.
CAUTION:
Operation exceeding this range may result in a malfunction.
Perform the system operation check mode within this range.
[Mode Door Actuator Opening Angle Target]
 Operation of mode damper servo
Operate in the range from -32.68 to 133.33.
[In-vehicle Air Temperature setting]
 In-vehicle detection temperature settings
Operate in the range from -72.47 to 193.82.
[Ambient Air Temperature Setting]
 Ambient air detection temperature settings
Operate in the range from -40.00 to 80.00.
[Quantity of Sunload Setting]
 Sunload quantity detection settings
Operate in the range from 0 to 4448.
[Heater Water Temperature Setting]
 Heater water detection temperature settings
Operate in the range from -40.00 to 215.00.
[AUTO SW setting]
 Contact status of AUTO SW
ON - OFF
[Rear Defogger Setting]
 Contact status of rear defogger SW
ON - OFF
[A/C Change Setting]
 Contact status of A/C switch
ON - OFF
[Fresh/Rec Air Dr Act Trgt Open Angle]
 Operation of RECIRC/FRESH damper servo
RECIRC - FRESH
SSM3 screen: [Each System Check] → [Engine Control System] → [Work Support] → [System Operation Check Mode]
Item Name
 Drive
[A/C Compressor Relay]
 Magnet clutch operation
ON - OFF
DTCB1430/21 Room temperature sensor circuit wire break
DTCB1431/-21 Room temperature sensor circuit short-circuit
Circuit description
The cooler thermistor (in-vehicle sensor) is installed on the instrument panel. It is used to detect the passenger compartment temperature and to control “AUTO” of the heater & air conditioner. The resistance of the cooler thermistor (in-vehicle sensor) varies along with change of the passenger compartment temperature. When the passenger compartment temperature is low, the resistance is high. In contrast, when the passenger compartment temperature is high, the resistance is small. The air conditioner control ASSY gives voltage output (5 V) to the cooler thermistor (in-vehicle sensor), and reads variation of voltage along with resistance change of the cooler thermistor (in-vehicle sensor).
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Judgment time for abnormality
 Inspection parts
B1430/21
1. None
2. Open circuit of cooler thermistor (in-vehicle sensor)
3. Judgment for current malfunction: 4.0 seconds or more continuously
Judgment for past malfunction (SSM3): 4.0 seconds or more continuously
Judgment for past malfunction (panel): 8.5 minutes or more continuously
·Cooler thermistor (in-vehicle sensor)
·Wire harness and connector (air conditioner control ASSY - cooler thermistor (in-vehicle sensor))
·Air conditioner control ASSY
B1431/-21
1. None
2. Short circuit (short-circuit) in cooler thermistor (in-vehicle sensor) circuit
3. Judgment for current malfunction: 4.0 seconds or more continuously
Judgment for past malfunction (SSM3): 4.0 seconds or more continuously
Judgment for past malfunction (panel): 8.5 minutes or more continuously
·Cooler thermistor (in-vehicle sensor)
·Wire harness and connector (air conditioner control ASSY - cooler thermistor (in-vehicle sensor))
·Air conditioner control ASSY
Circuit figure
Inspection steps
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete

3. Unit inspection of cooler thermistor (in-vehicle sensor)

(1) Remove the cooler thermistor (in-vehicle sensor). (Refer to )
(2) Perform the inspection of individual cooler thermistor (in-vehicle sensor). (Refer to )
NG
>Replacement of cooler thermistor (in-vehicle sensor) (Refer to )

OK▼

4. Inspection of wire harness and connector (cooler thermistor (in-vehicle sensor) - air conditioner control ASSY)

NOTE:
For inspection procedures and precautions, refer to .
(1) Disconnect connector D20 of the air conditioner control ASSY.
(2) Measure the resistance between the terminals.
Resistance (open circuit check)
Inspection terminals
 Inspection conditions
 Standard value
D67-1(-) - D20-6(SG)
 Always
 Less than 1 Ω
D67-2(+) - D20-5(TR)
 Always
 Less than 1 Ω
Resistance (short circuit check)
Inspection terminals
 Inspection conditions
 Standard value
D67-1 (-) - Chassis ground
 Always
 10 kΩ or more
D67-2 (+) - Chassis ground
 Always
 10 kΩ or more
NG
>Repair or replacement of wiring harness or connector

OK▼
Replacement of air conditioner control ASSY (Refer to )

DTCB1432/22 Ambient temperature sensor circuit wire break
DTCB1433/-22 Ambient temperature sensor circuit short-circuit
Circuit description
The thermistor ASSY is installed at the front of the condenser. It is used to detect the ambient air temperature, to display the ambient air temperature on the multi display of the combination meter ASSY, and to control “AUTO” of the heater & air conditioner. The resistance of the thermistor ASSY varies along with change of the ambient air temperature. When the ambient air temperature is low, the resistance is high. In contrast, when the ambient air temperature is high, the resistance is small. The combination meter ASSY gives voltage output (5 V) to the thermistor ASSY, and reads variation of voltage along with resistance change of the thermistor ASSY.
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Judgment time for abnormality
 Inspection parts
B1432/22
1. None
2. Open circuit of thermistor ASSY
3. Judgment for current malfunction: 1.0 minute or more continuously
Judgment for past malfunction (SSM3): 1.0 minute or more continuously
Judgment for past malfunction (panel): None
·Thermistor ASSY
·Wire harness and connector (air conditioner control ASSY - thermistor ASSY)
·CAN communication system
·Air conditioner control ASSY
B1433/-22
1. None
2. Short circuit in thermistor ASSY circuit
3. Judgment for current malfunction: 1.0 minute or more continuously
Judgment for past malfunction (SSM3): 1.0 minute or more continuously
Judgment for past malfunction (panel): None
·Thermistor ASSY
·Wire harness and connector (air conditioner control ASSY - thermistor ASSY)
·CAN communication system
·Air conditioner control ASSY
Circuit figure
Inspection steps
CAUTION:
·The heater & air conditioner system uses the CAN communication system. First, according to “How to troubleshoot”, inspect the “Communication function” and make sure that there is no problem in the communication system before troubleshooting.
·This diagnostic code may be affected by abnormality of the combination meter ASSY. Before inspection, check the diagnostic code of “Meter & gauge system” and make sure that it is normal.
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete

3. Unit inspection of thermistor ASSY

(1) Remove the thermistor ASSY.
(2) Inspect the individual thermistor ASSY. (Refer to )
NG
>Replacement of thermistor ASSY (Refer to )

OK▼

4. Inspection of wire harness and connector (thermistor ASSY - combination meter ASSY)

NOTE:
For inspection procedures and precautions, refer to .
(1) Disconnect connector D7 of the combination meter ASSY. (Refer to )
(2) Measure the resistance between the terminals. (For terminal arrangement, refer to .)
Resistance (open circuit check)
Inspection terminals
 Inspection conditions
 Standard value
A48-1 - D7-24(TAM)
 Always
 Less than 1 Ω
A48-2 - D7-25(SG-)
 Always
 Less than 1 Ω
Resistance (short circuit check)
Inspection terminals
 Inspection conditions
 Standard value
A48-1 - Chassis ground
 Always
 10 kΩ or more
A48-2 - Chassis ground
 Always
 10 kΩ or more
NG
>Repair or replacement of wiring harness or connector

OK▼
Replacement of air conditioner control ASSY (Refer to )

DTCB1434/23 Evaporator sensor circuit wire break
DTCB1435/-23 Evaporator sensor circuit short-circuit
Circuit description
Cooler thermistor NO.1 is installed at the evaporator of the air conditioner unit. It is used to detect the cool air temperature through the evaporator and to control the air conditioner. The resistance of cooler thermistor NO.1 varies along with change of the cool air temperature through the evaporator. When the cool air temperature is low, the resistance is high. In contrast, when the cool air temperature is high, the resistance is small. The air conditioner control ASSY gives voltage output (5 V) to cooler thermistor NO.1, and reads variation of voltage along with resistance change of cooler thermistor NO.1.
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Judgment time for abnormality
 Inspection parts
B1434/23
1. None
2. Open circuit of cooler thermistor NO.1
3. Judgment for current malfunction: 4.0 seconds or more continuously
Judgment for past malfunction (SSM3): 4.0 seconds or more continuously
Judgment for past malfunction (panel): 8.5 minute or more continuously
·Cooler thermistor NO.1
·Wire harness and connector (air conditioner control ASSY - cooler thermistor NO.1)
·Air conditioner control ASSY
B1435/-23
1. None
2. Short circuit in cooler thermistor NO.1 circuit
3. Judgment for current malfunction: 4.0 seconds or more continuously
Judgment for past malfunction (SSM3): 4.0 seconds or more continuously
Judgment for past malfunction (panel): 8.5 minute or more continuously
·Cooler thermistor NO.1
·Wire harness and connector (air conditioner control ASSY - cooler thermistor NO.1)
·Air conditioner control ASSY
Circuit figure
Inspection steps
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete

3. Unit inspection of cooler thermistor NO.1

(1) Disconnect connector A25 of cooler thermistor NO.1 (after-evaporator sensor) from the air conditioner control ASSY.
(2) Perform the inspection of individual cooler thermistor NO.1 (after-evaporator sensor). (Refer to )
NG
>Replacement of cooler thermistor NO.1 (Refer to )

OK▼

4. Inspection of wire harness and connector (cooler thermistor NO.1 - air conditioner control ASSY)

NOTE:
For inspection procedures and precautions, refer to .
(1) Disconnect connector D20 of the air conditioner control ASSY.
(2) Measure the resistance between the terminals.
Resistance (open circuit check)
Inspection terminals
 Inspection conditions
 Standard value
A25-1(+) - D20-17 (TE)
 Always
 Less than 1 Ω
A25-2(-) - D20-6 (SG)
 Always
 Less than 1 Ω
Resistance (short circuit check)
Inspection terminals
 Inspection conditions
 Standard value
A25-1 (+) - Chassis ground
 Always
 10 kΩ or more
A25-2 (-) - Chassis ground
 Always
 10 kΩ or more
NG
>Repair or replacement of wiring harness or connector

OK▼
Replacement of air conditioner control ASSY (Refer to )

DTCB1436/45 Air mix door actuator potentiometer circuit wire break (passenger’s seat)
DTCB1437/-45 Air mix door actuator potentiometer circuit short-circuit (passenger’s seat)
DTCB1441/E45 Air mix door actuator lock (passenger’s seat)
Circuit description
The damper position of air conditioner radiator damper servo SUB-ASSY NO.4 is detected by the air conditioner control ASSY. Based on this, the air conditioner control ASSY rotates the motor (forward or backward) to move the air mix damper at the desired position. This adjusts the air flow in the heater core after the evaporator and controls the outlet temperature.
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Judgment time for abnormality
 Inspection parts
B1436/45
1. When air conditioner radiator damper servo SUB-ASSY NO.4 is operated
2. Open circuit of damper servo circuit
3. Judgment for current malfunction: 0.02 seconds or more continuously
Judgment for past malfunction (SSM3): 0.02 seconds or more continuously
Judgment for past malfunction (panel): 1 minute or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.4
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.4)
·Air conditioner control ASSY
B1437/-45
1. When air conditioner radiator damper servo SUB-ASSY NO.4 is operated
2. Short circuit in damper servo circuit
3. Judgment for current malfunction: 0.02 seconds or more continuously
Judgment for past malfunction (SSM3): 0.02 seconds or more continuously
Judgment for past malfunction (panel): 1 minute or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.4
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.4)
·Air conditioner control ASSY
B1441/E45
1. When air conditioner radiator damper servo SUB-ASSY NO.4 is operated
2. Although the damper servo drive request signal is output, the position information of the servo is not changed or abnormal
3. Judgment for current malfunction: 16 seconds or more continuously
Judgment for past malfunction (SSM3): 16 seconds or more continuously
Judgment for past malfunction (panel): 1 minute or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.4
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.4)
·Air conditioner control ASSY
Circuit figure
Inspection steps
CAUTION:
This diagnostic code is output for lock of the damper link or damper. Before performing the inspection, make sure that there is no mechanical malfunction.
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete

5. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete (malfunction of air conditioner radiator damper servo SUB-ASSY NO.4)

DTCB1438/49 Mode Door Actuator Potentiometer Circuit Open
DTCB1439/-49 Mode Door Actuator Potentiometer Circuit Short
DTCB1443/E49 Mode Door Actuator Lock
Circuit description
The damper position of air conditioner radiator damper servo SUB-ASSY NO.3 is detected by the air conditioner control ASSY. Based on this, the air conditioner control ASSY rotates the motor (forward or backward) to move the mode damper at the desired position. This controls switching of the outlets.
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Judgment time for abnormality
 Inspection parts
B1438/49
1. When the damper servo is operated
2. Open circuit of damper servo circuit
3. Judgment for current malfunction: 0.02 seconds or more
Judgment for past malfunction (SSM3): 0.02 seconds or more
Judgment for past malfunction (panel): 1 minute or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.3
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.3)
·Air conditioner control ASSY
B1439/-49
1. When the damper servo is operated
2. Short circuit in damper servo circuit
3. Judgment for current malfunction: 0.02 seconds or more
Judgment for past malfunction (SSM3): 0.02 seconds or more
Judgment for past malfunction (panel): 1 minute or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.3
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.3)
·Air conditioner control ASSY
B1443/E49
1. When the damper servo is operated
2. Although the damper servo drive request signal is output, the position information of the servo is not changed or abnormal
3. Judgment for current malfunction: 16 seconds or more continuously
Judgment for past malfunction (SSM3): 16 seconds or more continuously
Judgment for past malfunction (panel): 1 minute or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.3
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.3)
·Air conditioner control ASSY
Circuit figure
Inspection steps
CAUTION:
This diagnostic code is output for lock of the damper link or damper. Before performing the inspection, make sure that there is no mechanical malfunction.
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete (malfunction of air conditioner radiator damper servo SUB-ASSY NO.3)

5. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code output again. (Refer to )
Criteria :  No DTC output
NG
>Repair or replacement of wiring harness or connector

OK▼
Complete (malfunction of air conditioner radiator damper servo SUB-ASSY NO.3)

DTCB1440/41 Air mix door actuator potentiometer circuit wire break (driver’s seat)
DTCB1442/-41 Air mix door actuator potentiometer circuit short-circuit (driver’s seat)
DTCB1446/E41 Air mix door actuator lock (driver’s seat)
Circuit description
The damper position of air conditioner radiator damper servo SUB-ASSY NO.5 (driver’s side) is detected by the air conditioner control ASSY. Based on this, the air conditioner control ASSY rotates the motor (forward or backward) to move air conditioner radiator damper servo SUB-ASSY NO.5 at the desired position. This adjusts the air flow rate in the heater core after the evaporator.
Diagnostic codes
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Abnormal period
 Faulty part
B1440/41
1. When air conditioner radiator damper servo SUB-ASSY NO.5 is operated
2. Open circuit of damper servo circuit
3. Judgment for current malfunction: 0.02 seconds or more continuously
Judgment for past malfunction (SSM3): 0.02 seconds or more continuously
Judgment for past malfunction (panel): 1 minutes or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.5
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.5)
·Air conditioner control ASSY
B1442/-41
1. When air conditioner radiator damper servo SUB-ASSY NO.5 is operated
2. Short circuit in damper servo circuit
3. Judgment for current malfunction: 0.02 seconds or more continuously
Judgment for past malfunction (SSM3): 0.02 seconds or more continuously
Judgment for past malfunction (panel): 1 minutes or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.5
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.5)
·Air conditioner control ASSY
B1446/E41
1. When air conditioner radiator damper servo SUB-ASSY NO.5 is operated
2. Although the damper servo drive request signal is output, the position information of the servo is not changed or abnormal
3. Judgment for current malfunction: 16 seconds or more continuously
Judgment for past malfunction (SSM3): 16 seconds or more continuously
Judgment for past malfunction (panel): 1 minutes or more continuously
·Air conditioner radiator damper servo SUB-ASSY NO.5
·Wire harness and connector (air conditioner control ASSY - air conditioner radiator damper servo SUB-ASSY NO.5)
·Air conditioner control ASSY
Circuit figure
Inspection steps
CAUTION:
This diagnostic code is output for lock of the damper link or damper. Before performing the inspection, make sure that there is no mechanical malfunction.
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete

5. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code output again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete (malfunction of air conditioner radiator damper servo SUB-ASSY NO.5)

DTCB14A1/25 Sunload Sensor Circuit Open
DTCB14A2/-25 Sunload Sensor Circuit Short
Circuit description
The automatic light control sensor is installed on the upper part of the instrument panel. It is used to detect sunload quantity and to control “AUTO” of the heater & air conditioner. The output current of the automatic light control sensor varies depending on the sunload quantity. When the sunload quantity is increased, the output current is large. In contrast, when the sunload quantity is reduced, the output current is small. The air conditioner control ASSY reads the current which is output from the automatic light control sensor.
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Judgment time for abnormality
 Inspection parts
B14A1/25
1. Without sunload
2. Open circuit of automatic light control sensor
3. Judgment for current malfunction: 4 seconds or more continuously
Judgment for past malfunction (SSM3): None
Judgment for past malfunction (panel): None
·Automatic light control sensor
·Wire harness and connector (between automatic light control sensor and - main body ECM)
·Wire harness and connector (between automatic light control sensor and - air conditioner control ASSY)
·Main body ECM (multiplex network body computer)
·Air conditioner control ASSY
B14A2/-25
1. With sunload
2. Short circuit in automatic light control sensor circuit
3. Judgment for current malfunction: 4 seconds or more continuously
Judgment for past malfunction (SSM3): 4 seconds or more continuously
Judgment for past malfunction (panel): 8.5 minutes or more continuously
·Automatic light control sensor
·Wire harness and connector (between automatic light control sensor and - main body ECM)
·Wire harness and connector (between automatic light control sensor and - air conditioner control ASSY)
·Main body ECM (multiplex network body computer)
·Air conditioner control ASSY
NOTE:
·If diagnostic code B1244 (Light Sensor Circuit) is also output, the automatic light control sensor power may be abnormal.
·When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as having an open circuit.
Always check the sunload sensor in direct sunlight.
Circuit figure
Inspection steps
2. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  No DTC output
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete

3. Inspection of wire harness and connector (automatic light control sensor - air conditioner control ASSY)

NOTE:
For inspection procedures and precautions, refer to .
(1) Disconnect the connector D45 of the automatic light control sensor.
(2) Disconnect connector D20 of the air conditioner control ASSY.
(3) Inspect the resistance between connector terminals at the vehicle wire harness side.
Resistance (open circuit check)
Inspection terminals
 Inspection conditions
 Standard value
D20-2 (CLTS) - D45-1 (TSO)
 Always
 Less than 1 Ω
Resistance (short circuit check)
Inspection terminals
 Inspection conditions
 Standard value
D20-2 (CLTS) - Chassis ground
 Always
 10 kΩ or more
NG
>Repair or replacement of wiring harness or connector

OK▼

DTCE24 Engine Coolant Temperature Sensor Malfunction/Communication Error
Circuit description
The air conditioner control ASSY has CAN communication with the engine control computer. The engine control computer calculates the coolant temperature based on the output voltage of the E.F.I. water temperature sensor. If the output voltage of the E.F.I. water temperature sensor is beyond the normal range, the E.F.I. water temperature sensor may have malfunction, open circuit or short circuit.
DTC NO.
 Detecting conditions
1. Diagnosis condition
2. Abnormal condition
3. Abnormal period
 Inspection parts
E24
1. None
2. Sensor malfunction/communication error
3. Judgment for current malfunction (panel): 4.0 seconds or more continuously
·E.F.I. water temperature sensor
·Wire harness and connector (engine control computer - E.F.I. water temperature sensor)
·Engine control computer
·Air conditioner control ASSY
·CAN communication system
DTCU0073 CAN Communication Error
DTCU0100 Lost Communication With ECM/PCM "A"
DTCU0101 Lost Communication With TCM
DTCU0122 Lost Communication With Vehicle Dynamics Control Module
DTCU0140 Lost Communication With Body Control Module
DTCU0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module
DTCU0401 Invalid Data Received From ECM/PCM "A"
DTCU0402 Invalid Data Received From TCM
DTCU0416 Invalid Data Received From Vehicle Dynamics Control Module
DTCU0422 Invalid Data Received From Body Control Module
DTCU0423 Invalid Data Received From Instrument Panel Cluster Control Module
Description of functions
The air conditioner amplifier ASSY receives signals from the engine control computer, steering control computer, main body ECM (multiplex network body computer) and combination meter ASSY through the CAN communication.
DTC NO.
 Detecting conditions
 Inspection parts
U0073
 CAN Communication Error
·CAN communication system
U0100
 Lost Communication With ECM/PCM "A"
·CAN communication system
·Engine control computer
U0101
 Lost Communication With TCM
·CAN communication system
·Transmission control computer ASSY
U0122
 Lost Communication With Vehicle Dynamics Control Module
·CAN communication system
·Brake actuator ASSY
U0140
 Lost Communication With Body Control Module
·CAN communication system
·Main body ECM (Network gateway computer)
U0155
 Lost Communication With Instrument Panel Cluster (IPC) Control Module
·CAN communication system
·Combination meter ASSY
U0401
 Invalid Data Received From ECM/PCM "A"
·CAN communication system
·Engine control computer
U0402
 Invalid Data Received From TCM
·CAN communication system
·Transmission control computer ASSY
U0416
 Invalid Data Received From Vehicle Dynamics Control Module
·CAN communication system
·Brake actuator ASSY
U0422
 Invalid Data Received From Body Control Module
·CAN communication system
·Main body ECM (Network gateway computer)
U0423
 Invalid Data Received From Instrument Panel Cluster Control Module
·CAN communication system
·Combination meter ASSY
Inspection steps
1. Checking diagnostic codes

(1) Clear the diagnostic code using the SSM3. (Refer to )
(2) Using SSM3, check the diagnostic code again. (Refer to )
Criteria :  Diagnostic code is not output.
NOTE:
·When the diagnostic code of abnormal CAN communication system is output, refer to “How to troubleshoot” of the CAN communication system.
·If the diagnostic code of abnormal CAN communication system and other diagnostic code are output at the same time, perform troubleshooting on other diagnostic code after recovery of abnormal CAN communication.
NG
>To CAN communication system (Refer to )

OK▼
See how to simulate trouble phenomenon (Refer to )

Blower motor circuit
Circuit description
The blower motor SUB-ASSY (with fan) reads the signal from the air conditioner control ASSY and controls the revolution and speed of the motor.
Circuit figure
Inspection steps
CAUTION:
Before performing the troubleshooting, check the fuse of this circuit.
2. Unit inspection of blower motor relay

(1) Remove the blower motor relay from the relay block ASSY.
(2) Inspect the individual blower motor relay. (Refer to )
NG
>Replacement of heater relay

OK▼

3. Inspection of wire harness and connector (blower motor relay - air conditioner control ASSY)

NOTE:
For inspection procedures and precautions, refer to .
(1) Connect the blower motor relay to the relay block ASSY.
(2) Disconnect connector D19 from the air conditioner control ASSY.
(3) Measure the voltage between the terminals.
Voltage
Inspection terminals
 Inspection conditions
 Standard value
D19-8 (HR) - Chassis ground
 Always
 10 to 16 V
Captions in illustration
*a
 Front side of vehicle wiring harness connector
(Air conditioner control ASSY connector)
NG
>Repair or replacement of wiring harness or connector

OK▼

6. Inspection of wire harness and connector (blower motor SUB-ASSY (with fan) - blower register)

NOTE:
For inspection procedures and precautions, refer to .
(1) Disconnect connector A27 from the blower register.
(2) Measure the voltage between the terminals.
Voltage
Inspection terminals
 Inspection conditions
 Standard value
A27-5 (S) - Chassis ground
 IG ON, blower ON
 10 to 16 V
Captions in illustration
*a
 Front side of vehicle wiring harness connector
(Blower register connector)
NG
>Repair or replacement of wiring harness or connector

OK▼

10. Check operation.

(1) Check if the blower motor SUB-ASSY (with fan) operates normally.
Criteria :  The blower motor SUB-ASSY (with fan) operates normally.
NG
>Replacement of air conditioner control ASSY (Refer to )

OK▼
Complete (malfunction of blower resistor)

Magnet clutch relay circuit
Circuit description
The air conditioner control ASSY transmits the magnet clutch ON instruction to the engine control computer through the CAN communication. The engine control computer operates the magnet clutch relay and turns ON the magnet clutch.
Circuit figure
Inspection steps
CAUTION:
·Before performing the troubleshooting, check the fuse of this circuit.
·This inspection may be affected by abnormality of the engine control computer. Before inspection, check the diagnostic code of “engine” and make sure that it is normal.
4. Inspection of wire harness and connector (heater relay - power supply system)

NOTE:
For inspection procedures and precautions, refer to .
(1) Inspect the voltage between connector terminals at the vehicle wire harness side.
Voltage
Inspection terminals
 Inspection conditions
 Standard value
5 - Chassis ground
 IG OFF
 Less than 1 V
IG ON
 11 to 14 V
Captions in illustration
*1
 Engine compartment relay block
*2
 Heater relay
NG
>Repair or replacement of wiring harness or connector

OK▼

5. Inspection of wire harness and connector (heater relay - air conditioner control ASSY)

NOTE:
For inspection procedures and precautions, refer to .
(1) Remove the heater relay from the engine compartment relay block.
(2) Disconnect connector D19 from the air conditioner control ASSY.
(3) Inspect the resistance between connector terminals at the vehicle wire harness side.
Resistance
Inspection terminals
 Inspection conditions
 Standard value
2 - D19-2(PSW)
 Always
 Less than 1 Ω
2 - Chassis ground
 Always
 10 kΩ or more
NG
>Repair or replacement of wiring harness or connector

OK▼

10. Check of refrigerant pressure

(1) Install the air conditioner tool.
(2) Check the gauge pressure to inspect filling of the refrigerant gas. (Refer to )
Criteria :  Refrigerant gas is full.
NG
>Adjustment of refrigerant level

OK▼

15. Unit inspection of air conditioner pressure switch

NG
>Replacement of air conditioner pressure switch

OK▼

16. Replacement of engine control computer

(1) Replace with a new or normal engine control computer. (Refer to )

Next▼