B1462

AIR CONDITIONING SYSTEM: B1462/62: Room Humidity Sensor Circuit

DTC B1462/62 - Room Humidity Sensor Circuit

DESCRIPTION

The A/C room humidity sensor detects cabin humidity. The voltage of the A/C room temperature sensor changes in accordance with cabin humidity. The A/C amplifier assembly reads changes in the A/C room humidity sensor.
The A/C room humidity sensor is integrated with the A/C room temperature sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and push the Techstream main switch on.
(c) Select the item below in the DATA LIST, and read the display on the Techstream.

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. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Remove the A/C amplifier assembly with the connectors still connected.
(b) Measure the voltage according to the value(s) in the table below.
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 A/C ROOM TEMPERATURE SENSOR

(a) Remove the A/C room temperature sensor.
(b) Turn the ignition switch ON.

- Do not touch the A/C room humidity sensor because it may be affected by body temperature and may not work properly.
- Be sure to hold the connector of the sensor.
- The output voltage at 25°C (77°F) is shown above.

NG -- REPLACE A/C ROOM TEMPERATURE SENSOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - A/C AMPLIFIER ASSEMBLY)

(a) Disconnect the connector from the A/C amplifier assembly.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

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