Air Conditioning System

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1411/11: Room Temperature Sensor Circuit

DTC B1411/11 - Room Temperature Sensor Circuit

DESCRIPTION

This cooler thermistor detects the temperature inside the cabin and sends appropriate signals to the A/C amplifier.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (ROOM TEMPERATURE SENSOR)
(a) Check the Data List for proper functioning of the room temperature sensor.

Air Conditioner





OK:
The display is as specified in the normal condition.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (TR - SG-2 VOLTAGE)




(a) Remove the amplifier but do not disconnect the connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the connector.
Standard voltage:





HINT: As the temperature increases, the voltage decreases.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
3. INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)




(a) Remove the cooler thermistor.
(b) Measure the resistance of the thermistor.
Standard resistance:





HINT: As the temperature increases, the resistance decreases.

NG -- REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)
OK -- Continue to next step.
4. CHECK WIRE HARNESS (COOLER THERMISTOR - A/C AMPLIFIER)




(a) Disconnect the A11 thermistor connector.
(b) Disconnect the A9 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY