B1462

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

DESCRIPTION

The room humidity sensor detects room humidity. The voltage of the room humidity sensor changes in accordance with room humidity. The A/C amplifier reads changes in the room humidity sensor.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Select the item below in the Data List, and read the display on the Techstream.

Data List / Air Conditioner





OK:

The display is as specified in the normal condition.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER)





(a) Disconnect the K33 room temperature sensor connector.

(b) Disconnect the K52 A/C amplifier connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





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

3. CHECK AIR CONDITIONING AMPLIFIER (S5-1 - SG-1 VOLTAGE)





(a) Remove the A/C amplifier with its connectors still connected.

(b) Measure the voltage of the connector.

Standard voltage:





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

4. INSPECT ROOM TEMPERATURE SENSOR (ROOM HUMIDITY SENSOR)





(a) Remove the room temperature sensor.

(b) Measure the voltage of the sensor.

Standard voltage:





NOTICE:
* Do not touch the humidity sensor as body heat will affect the inspection results. When performing the inspection, hold the sensor by its connector.
* Allow the sensor to acclimate to the ambient temperature and humidity before performing the inspection.
* The standard voltages in the table above are based on inspections performed when the ambient temperature is 25°C (77°F).

NG -- REPLACE ROOM TEMPERATURE SENSOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER