Unified Meter and A/C Amp

UNIFIED METER AND A/C 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 conditioning system operation. The air mix door motors, 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 automatic air conditioning system.


Component Function Check


1. CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.Press AUTO switch.
2.Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection).
(Discharge air and fan 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. INSPECTION BY FAIL-SAFE FUNCTION

1.Turn the ignition switch ON.
2.After approximately 30 seconds, check that the air conditioning system is operated by the fail-safe function (the operation display of air conditioning system is not performed). Refer to "Fail-safe" Unified Meter and A/C Amp.
Is the fail-safe function operated?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK UNIFIED METER AND A/C AMP. POWER SUPPLY CIRCUIT AND GROUND

Check unified meter and A/C amp. power supply circuit and ground circuit. Refer to "UNIFIED METER AND A/C AMP. : Diagnosis Procedure" Automatic Air Conditioning.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace parts according to the inspection results.

3. CHECK PRESET SWITCH

Check preset switch. Refer to the following.
-"Symptom Table" Symptom Table Base Audio (BASE AUDIO WITHOUT NAVIGATION)
-"Symptom Table" Without Navigation (BOSE AUDIO WITHOUT NAVIGATION)
-"Symptom Table" With Navigation (BOSE AUDIO WITH NAVIGATION)
Is the inspection result normal?
YES- Replace unified meter and A/C amp.
NO- Repair or replace malfunctioning part.