Possible Causes

CONTROL HEAD - SHORT TO GROUND

A/C SWITCH SENSE CIRCUIT SHORT TO GROUND

A/C SW SENSE CIRCUIT SHORT TO SENSOR GROUND

BODY CONTROL MODULE - A/C SWITCH SENSE SHORT TO GROUND

CONTROL HEAD - A/C SWITCH SENSE INCORRECT

BODY CONTROL MODULE - A/C SWITCH SENSE INCORRECT

INTERMITTENT WIRING PROBLEM