Diagnosis Procedure

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 conditioner 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 auto air conditioner system.




UNIFIED METER AND A/C AMP.


Diagnosis Procedure

1.INSPECTION BY FAIL-SAFE FUNCTION
1. Turn the ignition switch ON.
2. After approximately 30 seconds, check that the air conditioner is operated by the fail-safe function (the operation display of air conditioner is not performed). Refer to 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 Power Supply and Ground Circuit
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 Bose Audio (WITHOUT NAVIGATION), Navigation (Single Monitor)
[NAVIGATION (SINGLE MONITOR)] or Navigation (Twin Monitor) [NAVIGATION (TWIN MONITOR)].
Is the inspection result normal?
YES - Replace unified meter and A/C amp.
NO - Repair or replace malfunctioning part(s).