System Relay: Description and Operation

A/C relay
A/C relay is an electrical switching box that closes the circuit connected with A/CON fuse and compressor clutch. The relay is controlled by the engine control unit (ECU) only. If the engine coolant exceeds a certain temperature, the engine control unit (ECU) sends a signal to trigger A/C relay and to shut off A/C system. At starting or light acceleration, the engine control unit (ECU) sends a signal to trigger A/C relay and to shut off A/C system for five seconds. It is a replaceable item.