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Home >> Ford >> 2021 >> Mustang Mach-E Premium, AWD >> Repair and Diagnosis >> Electrical >> Gauges >> Instrumentation, Message Center And Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test W: The LH (Left-Hand) - RH (Right-Hand) Turn Signal Or High Beam RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On

Pinpoint Test W: The LH (Left-Hand) - RH (Right-Hand) Turn Signal Or High Beam RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On

  1. Normal Operation and Fault Conditions 

    See LH/RH Turn Signal or High Beam RTT indicator. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the left turn lamp on request, right turn lamp on request or high beam status message is missing for less than 5 seconds, the IPC defaults the specific indicator to its last indication state (on or off), based upon the last message received.

    If the left turn lamp on request, right turn lamp on request or high beam status message is missing for 5 seconds or longer, the IPC defaults the specific indicator off.

    Possible Sources 

    • Turn indicator concern
    • High beam concern
    • Communication concern
    • BCM
    • GWM
    • IPC

  2. W1 DETERMINE THE FAULT CONDITION

    • Ignition ON.

    • Check the operation of the turn signals or high beams.

    Do the turn signals or high beams operate correctly? 

    Yes  GO to  W2
    No  For high beams, REFER to: Headlamps . For turn signals, REFER to: Turn Signal and Hazard Lamps .

  3. W2 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors and hood.

    • Monitor the door ajar RTT warning indicator.

    • Open the driver door.

    • 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  W3
    No  GO to Pinpoint Test A 

  4. W3 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: Controller Area Network (CAN) Module Communications Network .
    No  GO to  W4

  5. W4 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • 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  DIAGNOSE all BCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart.
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