The air conditioning switch relays battery voltage to the ECM when the air conditioning is turned on. When the air conditioning ON signal is input, the ECM drives the ISC Actuator and turns ON the ignition power transistor. Then, the air conditioning power relay coil is energized to turn on the relay switch, which activates the compressor magnetic clutch.
Check item | Data display | Check condition | Air conditioning switch | Normal indicator |
Air conditioning switch | Switch state (ON/OFF) | Engine : Idling (air compressor is running when air conditioning switch is ON) | OFF | OFF |
ON | ON | |||
Air conditioning compressor | Air conditioning compressor | Engine : Idling after warm-up | OFF | OFF (compressor clutch non-activation) |
ON | ON |
Refer to GROUP-HA service adjustment procedures.
