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Home >> Lincoln >> 2021 >> Aviator Base, AWD >> Repair and Diagnosis >> Electrical >> Gauges >> Instrumentation, Message Center And Warning Chimes (2 Of 2) >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test U : The Led (Light Emitting Diode) Low Beam Malfunction RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On

Pinpoint Test U : The Led (Light Emitting Diode) Low Beam Malfunction RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On

  1. Normal Operation and Fault Conditions 

    See LED Low Beam Malfunction. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the headlamp low beam out message is missing for less than 5 seconds, the IPC defaults the LED low beam malfunction RTT indicator to its last indication state (on or off), based upon the last message received.

    If the headlamp low beam out message is missing for 5 seconds or longer, the IPC defaults the LED low beam malfunction RTT indicator off.

    Possible Sources 

    • Low beam lighting concern
    • Communication concern
    • GWM
    • BCM
    • IPC

  2. U1 DETERMINE THE FAULT CONDITION

    • Ignition ON.

    • Check the operation of the low beam headlamps.

    Do the low beam headlamps operate correctly? 

    Yes  GO to  U2
    No  REFER to: Headlamps .

  3. U2 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  U3
    No  GO to Pinpoint Test A 

  4. U3 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  GO to  U4

  5. U4 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 the IPC DTC Chart. Refer to Diagnostic Trouble Code (DTC) Chart 
    No  GO to  U5

  6. U5 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the IPC connector.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the IPC connector. Make sure it seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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