Manual Air Conditioning

POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

Description


COMPONENT DESCRIPTION

FRONT AIR CONTROL





The front air control 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.
POTENTIO TEMPERATURE CONTROL (PTC)
The PTC is built into the front air control.


Component Function Check


COMPONENT INSPECTION

SYMPTOM: A/C system does not come on.
INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK


1.Press A/C switch (indicator should illuminate).
2.Confirm that the compressor clutch engages (sound or visual inspection).
Is the inspection result normal?
YES- Inspection End.
NO- Go to diagnosis procedure for Power Supply Circuit for Front Air Control. Refer to "Diagnosis Procedure".


Diagnosis Procedure


DIAGNOSIS PROCEDURE FOR A/C SYSTEM






SYMPTOM: A/C system does not come on.

1. CHECK POWER SUPPLY CIRCUIT FOR FRONT AIR CONTROL

1.Disconnect front air control connector M37.
2.Press ignition switch ON.
3.Check voltage between front air control connector M37 terminals 15 and 14, and ground.





Is the inspection result normal?
YES- GO TO 2
NO-Check the following.
- 10A fuses [Nos. 6, and 3, located in the fuse block (J/B)].
- If fuses are OK, check for open circuit in wiring harness. Repair or replace as necessary.
- If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.

2. CHECK BODY GROUND CIRCUIT FOR FRONT AIR CONTROL

1.Press ignition switch OFF.
2.Check continuity between front air control connector M37 terminals 6and 7 and ground.





Is the inspection result normal?
YES- - Replace front air control. Service and Repair.
- Inspection End.
NO- Repair or replace harness.