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 AIR CONDITIONING AMPLIFIER





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

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:









(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- REPLACE AIR CONDITIONING HARNESS Disassembly