Diagnosis Procedure

POWER SUPPLY AND GROUND CIRCUIT FOR A/C AMP.


Description


COMPONENT DESCRIPTION

A/C AMP. (Air Conditioner Amplifier)





- The A/C amp. (1) has a built-in microcomputer which processes information sent from temperature control dial, and various switches needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower motor and compressor are then controlled.
- The A/C amp. is unitized with control mechanisms. Signal from various switches and potentio temperature control (PTC) are directly entered into A/C amp.

Power Supply and Ground Circuit for A/C Amp.






Potentio Temperature Control (PTC)

- The PTC (1) is built into the A/C amp.





- It can be set from cold to hot or any intermediate position by turning temperature control dial.





POWER SUPPLY AND GROUND CIRCUIT FOR A/C AMP.


Diagnosis Procedure

1.CHECK POWER SUPPLY CIRCUIT FOR A/C AMP.
1. Disconnect A/C amp. connector.
2. Check voltage between A/C amp. harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK FUSE
Check 10A fuses [Nos. 1, 8, 15 and 16, located in the fuse block (J/B)]. Diagrams.
Is the inspection result normal?
YES - Check harness for open circuit. Repair or replace if necessary.
NO - Replace the blown fuse after repairing the affected circuit if a fuse is blown.
3.CHECK GROUND CIRCUIT FOR A/C AMP.
1. Turn ignition switch OFF.
2. Check continuity between A/C amp. harness connector and ground.





Is the inspection result normal?
YES - Replace A/C control.
NO - Repair harness or connector.