B1497

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

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Remove the air conditioning amplifier assembly 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:





Text in Illustration





Result





C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

B -- REPLACE AIR CONDITIONING HARNESS ASSEMBLY Disassembly

A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures