B1462

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1462/62: Room Humidity Sensor Circuit
B1462/62 - Room Humidity Sensor Circuit

DESCRIPTION

The room humidity sensor detects cabin humidity. The voltage of the room humidity sensor changes in accordance with cabin humidity. The air conditioning amplifier assembly reads changes in the room humidity sensor.

The room humidity sensor is integrated with the room temperature sensor.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK AIR CONDITIONING AMPLIFIER

(a) Remove the air conditioning amplifier with the connectors still connected Removal.





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

Standard voltage:





HINT
As the temperature increases, the voltage decreases.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER Removal

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (For Automatic Air Conditioning System)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D26 sensor connector.





(b) Disconnect the D37 amplifier connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Reconnect the D37 amplifier connector.





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

Standard voltage:





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

Standard resistance:





NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal
OK -- Continue to next step.

4. INSPECT ROOM TEMPERATURE SENSOR (FRONT ROOM TEMPERATURE SENSOR)

(a) Remove the room temperature sensor with its connector still connected Removal.





(b) Turn the ignition switch to ON.

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





Standard voltage:





NOTICE:
* Touching the sensor even slightly may change the output voltage. Be sure to hold the connector of the sensor.
* The output voltages shown above are at 25°C (77°F).

NG -- REPLACE ROOM TEMPERATURE SENSOR (FRONT ROOM TEMPERATURE SENSOR) Removal

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal