Air Conditioning System (For Manual Air Conditioning System)

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1497: Communication Malfunction (Bus Ic)

DTC B1497 - Communication Malfunction (Bus Ic)

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT A/C AMPLIFIER




(a) Remove the A/C amplifier with the connectors still connected.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPLACE A/C AMPLIFIER
OK -- Continue to next step.

2. INSPECT A/C AMPLIFIER




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





Text in Illustration





NG -- REPLACE A/C AMPLIFIER
OK -- REPLACE AIR CONDITIONING HARNESS