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

NOTE: Before carrying out the following test, diagnose any PCM or Instrument Cluster (IC) DTCs.
NOTE: When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connector-locking device is in place and that the locking device and connector are correctly and fully seated.
  1. M1 CHECK THE ACCS PCM PID WITH THE A/C OFF 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: ACCS PCM PID
    • Does the ACCS PCM PID read ON? 
    1. YES  : Go to  M2.
    2. NO  : Go to  M4.
  2. M2 CHECK THE AIR CONDITIONING SWITCH STATUS (AC_SEL_SW) HVAC PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: AC_SEL_SW HVAC PID
    • Does the AC_SEL_SW HVAC PID read PRESSED? 
    1. YES  : Go to  M3.
    2. NO  : Go to  M4.
  3. M3 CHECK THE MODULE CONNECTION 
    • Carry out the HVAC Module Cold Boot Process.
      • NOTE: DATC systems only.
    • Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test.
    • Operate the system.
    • Does the concern return? 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. 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 
    • Clear the DTCs.
    • Disconnect all of the PCM connectors.
    • Check for:
      • corrosion.
      • pushed-out connectors.
      • incorrectly seated connector.
    • Connect and correctly seat all of the PCM connectors.
    • Operate the system.
    • Does the concern return? 
    1. YES  : INSTALL a new PCM. TEST the system for normal operation.
    2. 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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