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Pinpoint Test Ag : The Mil (Malfunction Indicator Lamp) Is Never Or Always On

  1. Normal Operation and Fault Conditions 

    See MIL. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the MIL request message is missing or invalid for less than 5 seconds, the IPC defaults the MIL to its last state (on or off) based upon the last known good message received.

    If the MIL request message is missing for 5 seconds or longer, the IPC defaults the MIL on.

    Possible Sources 

    • Communication concern
    • GWM
    • PCM
    • IPC

  2. AG1 IDENTIFY THE IPC (INSTRUMENT PANEL CLUSTER) LEVEL

    Is the vehicle equipped with a base or mid-level IPC? 

    Yes  GO to  AG3
    No  GO to  AG2

  3. AG2 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors, liftgate and hood.

    • Clear all message center warnings by pressing the OK button for each warning present.

    • Monitor the door ajar RTT warning indicator.

    • Open the driver door.

    • Clear the message center popup warning.

    • Monitor the door ajar RTT warning indicator.

    Is the door ajar RTT warning indicator off with the door closed, and on with the door open? 

    Yes  GO to  AG4
    No  GO to Pinpoint Test A 

  4. AG3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND

    • Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).

    • Access the IPC and control the TRANSA_LMPPID

    • Command the MIL on and off.

    Does the MIL illuminate when commanded on and turn off when commanded off? 

    Yes  GO to  AG4
    No  Refer to IPC Guided Routine Testing .

  5. AG4 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Ignition ON.

    • Using a diagnostic scan tool, perform the IPC self-test.

    • Ceck for recorded Diagnostic Trouble Codes (DTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the DTC Chart: IPC .
    No  GO to  AG5

  6. AG5 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (DTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network .
    No  If the MIL is never on, the system is operating correctly at this time. If the MIL is always on, DIAGNOSE all PCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart.
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