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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1440 (Instrument Cluster Illumination And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test B: All Dimmable Switch Illumination Is Inoperative >> Pinpoint Test B: All DIMMABLE Switch Illumination Is Inoperative

Pinpoint Test B: All DIMMABLE Switch Illumination Is Inoperative

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. B1 CHECK FOR RECORDED SJB DTCs FROM THE SELF-TEST 
    • Use the recorded results from the SJB self-test.
    • Is DTC B2A33 or DTC B29B8 present? 
    • Yes:  VERIFY the SJB fuse 10 (15A) is OK. If OK, GO to  B2.

      If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. After the repair:

      If no DTCs are present, TEST the system for normal operation.

      If DTC B106E is present, CLEAR the DTCs and REPEAT the self-test (required to enable the backlighting output driver if DTC B106E is present)  . TEST the system for normal operation.

      If DTC B106F is present, INSTALL a new SJB. REFER to INSTALLATION . TEST the system for normal operation.

    • No:  GO to  B2.
  2. B2 BYPASS THE SJB 
    NOTE: If the jumper wire fails, refer to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. After the repair:

    If no DTCs are present, test the system for normal operation.

    If DTC B106E is present, Clear the DTCs and repeat the self-test (required to enable the backlighting output driver if DTC B106E is present)  . TEST the system for normal operation.

    If DTC B106F is present, install a new SJB. Refer to INSTALLATION . TEST the system for normal operation.

    • Ignition OFF.
    • Disconnect: SJB C2280b.
    • For Fusion/Milan, connect a fused jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY), harness side and battery positive.
      Fig 1: Checking Circuit VLN04 For Open (Fusion/Milan)
      G06064792Courtesy of FORD MOTOR CO.
    • For MKZ, connect a fused jumper wire between the SJB C2280b-52, circuit VLN37 (BU/WH), harness side and battery positive.
      Fig 2: Checking Circuit VLN37 For Open (MKZ)
      G06271117Courtesy of FORD MOTOR CO.
    • Do the backlighting components illuminate? 
    • Yes:  REMOVE the jumper wire. GO to  B3.
    • No:  REMOVE the jumper wire. REPAIR circuit VLN04 (VT/GY) (Fusion/Milan) or circuit VLN37 (BU/WH) (MKZ) for an open. CLEAR the DTCs. REPEAT the self-test.
  3. B3 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 INSTALLATION . 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. CLEAR the DTCs. REPEAT the self-test.
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