B1497

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1497/97: BUS IC Communication Malfunction
B1497/97 - BUS IC Communication Malfunction

DESCRIPTION

The air conditioning harness connects the air conditioning amplifier and each servo. The air conditioning amplifier supplies power and sends operation instructions to each servo through the air conditioning harness. Each servo sends the damper position information to the air conditioning amplifier.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND)





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

(b) Measure the resistance of the wire harness side connector.

Standard resistance:





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

2. CHECK AIR CONDITIONING AMPLIFIER





(a) Reconnect the K52 A/C amplifier connector.

(b) Remove the air conditioning amplifier with its connectors still connected.

(c) Measure the resistance of the connectors.

Standard resistance:





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

3. CHECK AIR CONDITIONING AMPLIFIER





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

(b) Measure the voltage of the connector.

Standard voltage:





NG -- REPLACE AIR CONDITIONING AMPLIFIER

OK -- REPLACE AIR CONDITIONING HARNESS