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A/C Compressor Clutch Relay

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

When HVAC control assembly A/C button is depressed or front defrost mode is selected, an A/C request signal is sent to the Body Control Module (BCM). The BCM then sends a class 2 message to the Powertrain Control Module (PCM) through the class 2 serial data circuit. The PCM internally grounds the A/C compressor clutch relay, closing relay contacts and sending voltage to compressor clutch coil for compressor operation. Compressor clutch relay is located in underhood electrical center. See Figure.

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