Power Supply and Ground Circuit For Auto Amp.

Power Supply and Ground Circuit for Auto 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 motor, 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 control dial are operated, data is input to the auto amp. from the A/C controller using multiplex 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 controller. It can be set at an interval of 1 °C (2.0 °F) in the 18 °C (60 °F) to 32 °C (90 °F) temperature range by turning the temperature control dial.

Diagnostic Procedure For A/C System (Step 1):

Diagnostic Procedure For A/c System (Step 2):

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