HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostic Chart for Self-diagnosis

OPERATION

• DUAL AIR CONDITIONER MODEL

(1)

Defroster switch

(4)

A/C switch

(7)

OFF switch

(2)

Rear window defogger switch

(5)

FAN switch

(8)

Temperature adjustment dial

(3)

Air flow control switch

(6)

FRESH/RECIRC switch

(9)

AUTO switch

• SINGLE AIR CONDITIONER MODEL

NOTE:

For A/C system self-diagnosis, there is one that checks the control panel, and the other that checks the whole control system (sensor, actuator, blower motor, etc.). Perform the self-diagnosis for control panel first, and then perform the self-diagnosis for control system.

1. A/C CONTROL PANEL SELF-DIAGNOSIS

STEPCHECKYESNO

1.SET SELF-DIAGNOSIS MODE BY OPERATING A/C CONTROL PANEL.

1) Turn the ignition switch to OFF.

2) Turn the ignition switch to ON while pressing A/C switch and front defogger switch.

3) The screen display and indicator illuminate.

Does the self-diagnosis function operate?

2.CHECK DISPLAY AND INDICATOR.

Check if the screen display and all indicators illuminate.

Do the screen display and all indicators illuminate?

Replace the A/C control panel.

3.CHECK SWITCH AND TEMPERATURE CONTROL DIAL INPUT.

According to the switch check table, press each switch or turn the temperature control dial, and check that the corresponding screen display and indicators illuminate.

Does the screen display related to each switch and dial input illuminate?

Replace the A/C control panel.

4.CHECK A/C CONTROL PANEL COMMUNICATION.

1) Turn the ignition switch to OFF.

2) Disconnect the auto A/C control module harness connector.

3) Using a suitable lead wire, short the terminal No. 34 and No. 35 of auto A/C control module harness connector (B282).

4) Turn the ignition switch to ON while pressing the rear defogger switch and the A/C switch.

5) When no malfunction occurs in the control panel communication, “CL” is displayed in the screen; and when malfunction occurs, “OP” is displayed.

Is “CL” displayed on the screen?

A/C control panel is normal. Turn the ignition switch to OFF, and connect the auto A/C control module harness connector.

Replace the A/C control panel.

2. SWITCH CHECK TABLE

• DUAL AIR CONDITIONER MODEL

Switch

Display screen

Switch

Display screen

A/C switch

(9)

FAN switch (+)

(6)

AUTO switch

(7)

FAN switch (−)

(5)

Air flow control switch

(10)

Temperature control dial (right-hand dial)

Driver’s side

(3)

FRESH/RECIRC

FRESH

(8)

Passenger’s side

(16)

RECIRC

(13)

Temperature control dial (left-hand dial)

Driver’s side

(15)

Defroster switch

(1) (2)

Passenger’s side

(11)

Rear defogger switch

(12)

OFF switch

(4)

• SINGLE AIR CONDITIONER MODEL

Switch

Display screen

Switch

Display screen

A/C switch

(9)

FAN switch (+)

(6)

AUTO switch

(7)

FAN switch (−)

(5)

Air flow control switch

(10)

Temperature control dial (right-hand dial)

(14)

FRESH/RECIRC

RECIRC: (8)

Temperature control dial (left-hand dial)

(15)

FRESH: (13)

Defroster switch

(1) (2)

OFF switch

(4)

Rear defogger switch

(12)

3. A/C CONTROL SYSTEM SELF-DIAGNOSIS

STEPCHECKYESNO

1.SET SELF-DIAGNOSIS MODE BY OPERATING A/C CONTROL PANEL.

1) Turn the ignition switch to OFF.

2) Start the engine with the auto switch and FRESH/RECIRC switch pressed.

NOTE:

Self-diagnosis can also be performed with ignition switch ON, but start the engine because observing the magnet clutch operation is difficult.

3) All the indicators blink four times.

Does the self-diagnosis function operate?

2.CHECK EACH SENSOR AND POTENTIOMETER.

1) After the indicators stop blinking, automatically change to the Inspection Mode of sensor and potentiometer.

NOTE:

Display items can be changed each time the A/C switch is pressed. (Step Operation)

2) When malfunction occurs in each sensor and potentiometer, codes are displayed on the screen. When no malfunction occurs in each sensor and potentiometer, code “20” is displayed on the screen.

3) Identify defective sensors according to the sensor check table.

Are other codes except 20 displayed?

Repair defective sensors.

3.CHECK EACH ACTUATOR, BLOWER FAN AND MAGNET CLUTCH.

1) After completing each sensor and potentiometer inspection, change to the Inspection Mode of actuator, blower fan and magnet clutch by pressing the defroster switch.

2) Each mode will change and operate automatically every four seconds.

NOTE:

Operation mode items can be changed each time the A/C switch is pressed. (Step Operation)

3) Check the operation of actuator, blower fan and magnet clutch in each mode according to the operating mode table.

Do the actuator, blower fan and magnet clutch operate as described in the operating mode table?

A/C control system is normal. Press the OFF switch and complete the self-diagnosis function.

Repair defective parts in accordance with each diagnostic chart. or

4. SENSOR CHECK TABLE

NOTE:

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 with the sun shining on it.

Display screen (Malfunction at present) *1

Sensor

Trouble contents

21/AUTO Blink

In-vehicle sensor

Open

−21/AUTO Blink

Short

22/AUTO Blink

Ambient sensor

Sensor trouble or communication failure

23/AUTO Blink

Evaporator sensor

Open

−23/AUTO Blink

Short

24/AUTO Blink

Engine coolant temperature sensor

Sensor trouble or communication failure

25 Blink

Sunload sensor

Open *1

−25/AUTO Blink

Short

26/AUTO Blink

Air mix door actuator potentiometer (driver’s seat)

COOL

−26/AUTO Blink (Dual air conditioner only)

Air mix door actuator potentiometer (passenger’s seat)

COOL

27/AUTO Blink

Air mix door actuator potentiometer (driver’s seat)

HOT

−27/AUTO Blink (Dual air conditioner only)

Air mix door actuator potentiometer (passenger’s seat)

HOT

28/AUTO Blink

Mode door actuator potentiometer

FACE

29/AUTO Blink

DEF

43/AUTO Blink (With rear vent only)

Rear vent door actuator potentiometer

OPEN

44/AUTO Blink (With rear vent only)

SHUT

20 Blink

When all conditions are normal

*1: Present malfunction only is displayed for sunload sensor open circuit.

5. OPERATING MODE TABLE

Display screen

FRESH/RECIRC door

Mode door

Air mix door*1

Blower fan

A/C compressor (Magnet clutch)

Rear vent door open state*2

31

FRESH

FACE

Maximum cool

LO

OFF

100%

32

RECIRC

FACE

Maximum cool

LO

ON

100%

33

RECIRC

FACE

Maximum cool

M1

ON

100%

34

FRESH

B/L

50%

M1

ON

100%

35

FRESH

FOOT

50%

M1

ON

50%

36

FRESH

FOOT

Maximum hot

M3

ON

50%

37

FRESH

F/D

Maximum hot

M3

ON

50%

38

FRESH

DEF

Maximum hot

HI

ON

0%

*1: In the dual air conditioner models, open states for driver’s side and passenger’s side are the same. *2: Models with rear vent only