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A/C Signal: Description and Operation
DESCRIPTION The air conditioning
(A/C) signal is used to inform the
Engine Control Module (ECM) that a request for air conditioning has been made.
OPERATION When the A/C switch is closed, pin A26 of the ECM is grounded, informing the ECM that the air conditioning has been turned on. The ECM then controls the compressor relay and adjusts
idle speed to compensate for compressor load.