Circuit Operation

The A/C Compressor Control Relay cycles compressor ON or OFF by energizing/de-energizing the compressor clutch coil.

With the key on 12 volts is applied to the relay common contact and one coil terminal. The second terminal is grounded by the Powertrain Control Module (PCM) when the driver selects A/C or defrost modes, and the pressure cycling switch is closed.

When the relay is energized, current passes through the relay contacts and energizes the compressor clutch coil.