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Wide Open Throttle A/C Cut-Off Relay

NOTE: The Wide Open Throttle A/C Cut-Off (WAC) relay may also be referred to as the A/C clutch relay.

The WAC relay is normally open. There is no direct electrical connection between A/C switch or Electronic Air Temperature Control (EATC) module and A/C clutch. On some applications, A/C request signal will be sent to PCM through Standard Corporate Protocol (SCP) BUS (+) and BUS (-) circuits. When A/C is requested, PCM will ensure all other A/C related inputs and engine components are operating correctly before grounding WAC relay output, causing voltage to be sent to A/C clutch.

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