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Pinpoint Test M: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On

NOTE: It is important to install relays in their correct position in the Battery Junction Box (BJB). Installing a relay incorrectly can cause wiring shorts or damage to modules. While carrying out diagnostics on BJB relays, have only one BJB relay removed at a time. Failure to follow these instructions can result in damage to the vehicle circuitry or to control modules.
NOTE: Before carrying out the following test, diagnose any HVAC, PCM or IC DTCs.
  1. M1 CHECK THE AIR CONDITIONING COMPRESSOR CYCLING SWITCH (ACCS) PCM PID WITH THE A/C OFF 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: ACCS PCM PID.
    • Does the ACCS PCM PID read ON? 
      • Yes  : GO to M2.
      • No  : For Electronic Manual Temperature Control (EMTC) systems, GO to  M3.

        For Dual Automatic Temperature Control (DATC) systems, GO to M2.

  2. M2 CHECK THE AIR CONDITIONING SWITCH STATUS (CC_AC) HVAC PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: CC_AC HVAC PID.
    • Does the CC_AC HVAC PID read DEPRESSED? 
      • Yes  : GO to M3.
      • No  : GO to  M4.
  3. M3 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      • Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
      • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. M4 CHECK THE PCM CONNECTION 
    • Disconnect all the PCM connectors.
    • Inspect the module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the PCM connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      • Yes  : INSTALL a new PCM. TEST the system for normal operation.
      • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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