Power Supply And Ground Circuit For Controller

POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

Description


COMPONENT DESCRIPTION

Front air control.
The front air control has a built-in microcomputer that processes information sent from various sensors needed for air conditioner operation. The air mix door motor, the mode door motor, the intake door motor, the blower motor and the A/C compressor are then controlled.


Component Function Check


1. CHECK OPERATION

1.Turn the blower motor dial clockwise and verify the blower speed increases and that one of the LEDs illuminates on the mode switch.
2.Press the mode switches and verify that the modes change, the LEDs illuminate, and that air flows from the various vents.
3.Turn the temperature control dial and verify the temperature changes at the selected vents.
4.Press the DEF and REC buttons and verify air flow changes.
Does it operate normally?
YES- Inspection End.
NO- Perform trouble diagnosis for the front air control system. Refer to "Diagnosis Procedure" .


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Manual Air Conditioning.

1. CHECK FRONT AIR CONTROL POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect the front air control connector.
3.Turn ignition switch ON.
4.Check voltage between front air control harness connector M37 terminals 1, 2 and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK FUSE

Check fuses [Nos. 14 and 30, located in the fuse block (J/B)].
NOTE:
Refer to "Terminal Arrangement" Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES- Check harness for open circuit. Repair or replace if necessary.
NO- Check harness for short circuit. Repair or replace if necessary.

3. CHECK FRONT AIR CONTROL GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between front air control harness connector M37 terminals 9 and ground.





Is the inspection result normal?
YES- Replace the front air control. Refer to "Removal and Installation" Manual Air Conditioning.
NO- Repair the harnesses or connectors.