Room Temperature Sensor Circuit - Air Conditioning System

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





INSEPCTION 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