Power Supply And Ground Circuit For Auto Amp

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.

Description


COMPONENT DESCRIPTION

Auto Amp. (Automatic Amplifier)
- The auto amp. has a built-in microcomputer which processes information sent from various sensors needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower motor and compressor are then controlled.
- The auto amp. is unitized with control mechanisms. Signal from various switches and potentio temperature control (PTC) are directly entered into auto amp.
- Self-diagnosis functions are also built into auto amp. to provide quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
The PTC is built into the auto amp. It can be set at an interval of 1�C in the 18�C to 32�C temperature range by turning temperature control dial.


Component Function Check


1. CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.Turn fan control dial to AUTO position.
2.Press A/C switch.
3.A/C switch indicator turns ON. Confirm that the magnet clutch engages (sound or visual inspection). (Discharge air and blower speed depend on ambient, in-vehicle and set temperatures.)
Does magnet clutch engaged?
YES- INSPECTION END
NO- Go to Diagnosis Procedure. Refer to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK POWER SUPPLY CIRCUIT FOR AUTO AMP.

1.Disconnect auto amp. connector.
2.Check voltage between auto amp. harness connector and ground.





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

2. CHECK FUSE

Check 10A and 15A fuses [Nos. 1, 8, 15 and 16, located in the fuse block (J/B)]. Refer to "Fuse, Connector and 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- Replace the blown fuse after repairing the affected circuit if a fuse is blown.

3. CHECK GROUND CIRCUIT FOR AUTO AMP.

1.Turn ignition switch OFF.
2.Check continuity between auto amp. harness connector and ground.





Is the inspection result normal?
YES- Replace auto amp.
NO- Repair harness or connector.