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

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

SYMPTOM: A/C system does not come on.

Inspection Flow:

INSPECTION FLOW

COMPONENT DESCRIPTION




Unified meter and A/C amp. (Automatic Amplifier)
The unified meter and A/C amp. 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. The unified meter and A/C amp. is unitized with control mechanisms.

When the various switches and temperature dials are operated, data is input to the unified meter and A/C amp. from the BCM using CAN communication.

Self-diagnostic functions are also built into unified meter and A/C amp. to provide quick check of malfunctions in the auto air conditioner system.




Potentio Temperature Control (PTC)
The PTC is built into the A/C switch. It can be set at an interval of 0.5 °C (1.0 °F) in the 18 °C (60 °F) to 32 °C (90 °F) temperature range by pressing the temperature switch. The set temperature is displayed.

Diagnostic Procedure For A/C System:

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.