With Monochrome Display

POWER SUPPLY AND GROUND CIRCUIT


A/C AUTO AMP.

A/C AUTO AMP. : Description


COMPONENT DESCRIPTION

A/C Auto Amp. (Air Conditioner Automatic Amplifier)





The A/C auto amp. (1) has a built-in microcomputer that processes information sent from various sensors needed for air conditioner operation. The air mix door motor(s), the mode door motor, the intake door motor, the blower motor and the A/C compressor are then controlled.
When the various switches and temperature control switches are operated, data is input to the A/C auto amp. from the AV switch assembly using CAN communication.
The A/C auto amp. is operated with control mechanisms. Signals from various switches and Potentio Temperature Control (PTC) are directly entered into the A/C auto amp.

Power Supply and Ground Circuit for A/C Auto Amp.









POWER SUPPLY AND GROUND CIRCUIT


A/C AUTO AMP. : Diagnosis Procedure

Regarding Wiring Diagram information, With Monochrome Display.
1.CHECK A/C AUTO AMP. POWER SUPPLY





1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. connector.
3. Turn ignition switch ON.
4. Check voltage between A/C auto amp. harness connector M37 terminals 17, 20, 40 and ground.






Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK FUSE
Check 10A fuses [Nos. 3, 6 and 17, located in the fuse block (J/B)].

NOTE:
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 A/C AUTO AMP. GROUND CIRCUIT





1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector M37 terminals 19, 39 and ground.

19, 39 - Ground : Continuity should exist.

Is the inspection result normal?
YES - Replace the A/C auto amp. With Monochrome Display.
NO - Repair the harnesses or connectors.