Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

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A/C Switch Status/Evaporator Temperature Status

A/C SWITCH STATUS/EVAPORATOR TEMPERATURE STATUS
When the ignition is in the "run" position, the Body Control Module (BCM) monitors the evaporator temperature and the status of the A/C switch. Based on this information, the BCM sends a CCD message to the Powertrain Control Module (PCM) indicating the A/C switch status and the evaporator temperature status.