Room Humidity Sensor Circuit - Air Conditioning System (for Automatic Air Conditioning System)

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

DTC 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. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY





(a) Remove the air conditioning amplifier assembly with the connectors still connected.
(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 ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. INSPECT ROOM TEMPERATURE SENSOR





(a) Remove the room temperature sensor with its connector still connected.
(b) Turn the power switch on (IG).





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





NOTE:
- 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
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)





(a) Disconnect the connector from the air conditioning amplifier assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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