B1497

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

DTC 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 HARNESS AND CONNECTOR
(a) Remove the A/C amplifier.




(b) Disconnect the connector from the A/C amplifier.
(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.
2. CHECK AIR CONDITIONING AMPLIFIER




(a) Reconnect the connector to the A/C amplifier.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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




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






NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- REPLACE AIR CONDITIONING HARNESS