B1411/11

DESCRIPTION

This sensor detects the cabin temperature that is used as the basis for temperature control and sends a signal to the A/C amplifier.

DTC No.	DTC Detection Condition	Trouble Area
B1411/11	Room temperature sensor circuit (Open or short)	Room temperature sensor Harness or connector between room temperature sensor and A/C amplifier A/C amplifier

WIRING DIAGRAM

INSPECTION PROCEDURE

1. READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.

3. Select the item below in the Data List, and read the display on the intelligent tester.

   Data List / Air Conditioner: 

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   Room Temperature Sensor (Room Temp)	Room temperature sensor / min.: -6.5°C (20.3°F), max.: 57.25°C (135.05°F)	Actual cabin temperature is displayed	-

   OK:

   The display is as specified in the normal condition column.
   

   
   

   Result:

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
   OK (When troubleshooting according to the DTC)	C

B	PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C	REPLACE AIR CONDITIONING AMPLIFIER

A

2. INSPECT AIR CONDITIONING AMPLIFIER

1. Remove the A/C amplifier with the connectors still connected.

2. Turn the engine switch on (IG).

3. Measure the voltage according to the value(s) in the table below.

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   J58-16 (TR) - J58-19 (SG-1)	Engine switch on (IG) at 25°C (77°F)	1.8 to 2.2 V
   J58-16 (TR) - J58-19 (SG-1)	Engine switch on (IG) at 40°C (104°F)	1.2 to 1.6 V

   HINT:

   As the temperature increases, the voltage decreases.

   Result:

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
   OK (When troubleshooting according to the DTC)	C

B	PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C	REPLACE AIR CONDITIONING AMPLIFIER

A

3. INSPECT A/C ROOM TEMPERATURE SENSOR

1. Remove the A/C room temperature sensor.

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   J38-1 - J38-2	10°C (50°F)	3.00 to 3.73 kΩ
   J38-1 - J38-2	15°C (59°F)	2.45 to 2.88 kΩ
   J38-1 - J38-2	20°C (68°F)	1.95 to 2.30 kΩ
   J38-1 - J38-2	25°C (77°F)	1.60 to 1.80 kΩ
   J38-1 - J38-2	30°C (86°F)	1.28 to 1.47 kΩ
   J38-1 - J38-2	35°C (95°F)	1.00 to 1.22 kΩ
   J38-1 - J38-2	40°C (104°F)	0.80 to 1.00 kΩ
   J38-1 - J38-2	45°C (113°F)	0.65 to 0.85 kΩ
   J38-1 - J38-2	50°C (122°F)	0.50 to 0.70 kΩ
   J38-1 - J38-2	55°C (131°F)	0.44 to 0.60 kΩ
   J38-1 - J38-2	60°C (140°F)	0.36 to 0.50 kΩ

   NOTICE:

   1. Hold the sensor only by its connector. Touching the sensor may change the resistance value.
      
   2. When measuring, the sensor temperature must be the same as the ambient temperature.
      

   HINT:

   As the temperature increases, the resistance decreases (see the graph).

NG	REPLACE A/C ROOM TEMPERATURE SENSOR

OK

4. CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

1. Disconnect the connectors from the A/C room temperature sensor and A/C amplifier.

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   J58-16 (TR) - J38-1	Always	Below 1 Ω
   J58-19 (SG-1) - J38-2	Always	Below 1 Ω
   J58-16 (TR) - Body ground	Always	10 kΩ or higher
   J58-19 (SG-1) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE AIR CONDITIONING AMPLIFIER