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Home >> Ford >> 2014 >> Mustang Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster Illumination And Panel Illumination >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A: All Dimmable Illumination Is Inoperative >> Pinpoint Test A: All DIMMABLE Illumination Is Inoperative

Pinpoint Test A: All DIMMABLE Illumination Is Inoperative

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 CHECK FOR RECORDED SJB DTCs FROM THE ON-DEMAND SELF-TEST 
    • Use the recorded results from the SJB self-test.

    Are any DTCs recorded? 

    • Yes  : REFER to DTC CHARTS .
    • No  : GO to A2  .
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Ignition OFF.
    • Disconnect: Instrument Panel Dimmer Switch C2298  .
    • Place the headlamp switch in the PARKING LAMPS ON position.

    Do the dimmable components illuminate? 

    • Yes  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.
    • No  : GO to A3  .
  3. A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB C2280B  .
    • Measure the resistance between the instrument panel dimmer switch C2298-1  , circuit VLN18 (BU/WH), harness side and ground.
      Fig 1: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-1 And Ground
      G06141622Courtesy of FORD MOTOR CO.

    Is the resistance greater than 10, 000 ohms? 

    • Yes  : GO to A4  .
    • No  : REPAIR circuit VLN18 (BU/WH) for a short to ground. TEST the system for normal operation.
  4. A4 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • 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. CLEAR all DTCs. TEST the system for normal operation.
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