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Pinpoint Test Ac: The Eld (Electronic Locking Differential) RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On

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  1. Normal Operation and Fault Conditions 

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

    If the rear differential lock indicator request message is missing for less than 5 seconds, the IPC defaults the ELDRTT indicator to its last indication state (on or off), based upon the last message received.

    If the rear differential lock indicator request message is missing for 5 seconds or longer, the IPC sets DTC U0102:00 and defaults the ELDRTT indicator off.

    Possible Sources 

    • Communication concern
    • Message center concern
    • Locking differential concern
    • GWM concern
    • IPC

  2. AC1 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors and the hood.

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

    • Monitor the door ajar RTT indicator.

    • Open the driver door.

    • Clear the message center popup warning.

    • Monitor the door ajar RTT indicator.

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

    Yes  GO to  AC2
    No  GO to Pinpoint Test A 

  3. AC2 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Ignition ON.

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to Diagnostic Trouble Code (DTC) Chart .
    No  GO to  AC3

  4. AC3 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Controller Area Network (CAN) Module Communications Network .
    No  DIAGNOSE the ELD. For 8.8-inch ring gear, REFER to: Electronic Locking Differential (ELD) . For 9.75-inch ring gear, REFER to: Electronic Locking Differential (ELD) .
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