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Home >> Audi >> 2016 >> A6 Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 376 (Instrument Panel And Interior Switches Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A : All DIMMABLE Illumination Does Not Dim >> Pinpoint Test A : All DIMMABLE Illumination Does Not Dim

Pinpoint Test A : All DIMMABLE Illumination Does Not Dim

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. A1 CHECK THE RECORDED RESULTS FROM THE SCCM ON-DEMAND SELF-TEST

    • Ignition OFF.
    • Review the recorded results from the SCCM on-demand self-test.

    Is DTC B1124:09 present? 

    Yes  GO to  A2.
    No  GO to  A4.

  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH

    • Disconnect: Instrument Panel Dimmer Switch C2298 .
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SCCM Self-Test.
    • Clear the DTCs and repeat the SCCM self-test.

    Is DTC B1124:09 still present? 

    Yes  GO to  A3.
    No  INSTALL a new dimmer switch (part of the headlamp switch). REFER to Exterior Lighting .

  3. A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.
    • Disconnect: SCCM C226A .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2298-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-7
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-4
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  A9.
    No  REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.

  4. A4 CHECK THE INSTRUMENT PANEL DIMMER SWITCH

    • Disconnect: Instrument Panel Dimmer Switch C2298 .
    • Carry out the instrument panel dimmer switch component test. Refer to Component Testing for component testing.

    Is the instrument panel dimmer switch OK? 

    Yes  GO to  A5.
    No  INSTALL a new dimmer switch (part of the headlamp switch). REFER to Exterior Lighting .

  5. A5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH UP AND DOWN INPUT CIRCUITS FOR VOLTAGE

    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2298-2
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-7
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-4
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 5 volts? 

    Yes  GO to  A7.
    No  GO to  A6.

  6. A6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH UP AND DOWN INPUT CIRCUITS FOR AN OPEN

    • Ignition OFF.
    • Disconnect: SCCM C226A .

    Are the resistances less than 3 ohms? 

    Yes  GO to  A9.
    No  REPAIR the circuit in question for an open. TEST the system for normal operation.

  7. A7 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT AND RETURN CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: SCCM C226A .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2298-2
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-7
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2298-4
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit in question for a short to voltage. TEST the system for normal operation.
    No  GO to  A8.

  8. A8 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2298-4
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C226A-26

    Is the resistance less than 3 ohms? 

    Yes  GO to  A9.
    No  REPAIR the circuit for an open. TEST the system for normal operation.

  9. A9 CHECK FOR CORRECT SCCM OPERATION

    • Connect all disconnected connectors.
    • Disconnect all the SCCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SCCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  INSTALL a new SCCM. REFER to Steering Column Switches .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs.
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