A/C Signal: Description and Operation

PURPOSE / OPERATION
The Air Conditioning Switch applies the battery voltage to the Engine Control Module when the air conditioning is turned on. When the air conditioner ON signal is input, the Engine Control Module drives the Idle Speed Control Motor and turns ON the Ignition 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.