Diagnosis Procedure

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.


Description


COMPONENT DESCRIPTION

Unified Meter and A/C Amp. (Automatic Amplifier)





The unified meter and A/C amp. (1) has a built-in microcomputer which processes information sent from various sensors needed for air conditioner operation. The air mix door motor(s), mode door motor, intake door motor, blower motor and compressor are then controlled.
When the various switches and temperature control dial are operated, data is input to the unified meter and A/C amp. from the AV control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C amp. to provide quick check of malfunctions in the auto air conditioner system.

Power Supply and Ground Circuit for Unified Meter and A/C Amp.






Potentio Temperature Control (PTC)
The PTC (1) is built into the preset switch. It can be set at an interval of 0.5�C (1.0�F) in the 18�C (64�F) �C (90�F) temperature range by turning temperature control dial. The set temperature is displayed.





Without left and right ventilation temperature separately system





With left and right ventilation temperature separately system




POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.


Diagnosis Procedure

1.CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Disconnect unified meter and A/C amp. connector.
2. Check voltage between unified meter and 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. 3, 11 and 19, located in the fuse block (J/B)]. Refer to 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 and replace fuse.
3.CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Check continuity between unified meter and A/C amp. harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK PRESET SWITCH
Check preset switch. Refer to Symptom Related Diagnostic Procedures (BASE AUDIO WITHOUT NAVIGATION) or Bose Audio (BOSE AUDIO WITH NAVIGATION).
Is the inspection result normal?
YES - Replace unified meter and A/C amp.
NO - Repair or replace malfunctioning part(s).