System Description

DESCRIPTION
The air conditioning switch applies the battery voltage to the engine control module when the air conditioner is turned on.
When the air conditioning ON signal is input, the engine control module drives the idle speed control motor and turns ON the power transistor. And then the air conditioning power relay coil is energized to turn on the relay switch, which activates the air compressor magnetic clutch.

TROUBLESHOOTING HINTS
If the air compressor magnet clutch is not activated when the air conditioning switch is turned on during idling, faulty air conditioning control system is suspected.