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Home >> Ford >> 2012 >> Expedition 4WD >> 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 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

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 ON-DEMAND SELF-TEST 
    • Ignition OFF.
    • Use the recorded results from the SJB self-test.
    • Is DTC B2A32 or DTC B29B7 recorded? 
      • Yes  : GO to B2.
      • No  : VERIFY the SJB fuse 10 (15A) is OK, refer to SMART JUNCTION BOX (SJB) in OEM FUSE AND RELAY INFORMATION. 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 MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

  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 courtesy lamp output driver if DTC B106E is present)  . Test the system for normal operation.

    If DTC B106F is present, install a new SJB. Refer to MULTIFUNCTION ELECTRONIC MODULES . Test the system for normal operation.

    • Disconnect: SJB C2280b.
    • For DTC B2A32 or DTC B2A33, connect a fused jumper wire between the SJB C2280b-39, circuit VLN18 (BU/WH) and battery positive.
      Fig 1: Connecting Fused Jumper Wire Between C2280b-39, Circuit VLN18 (BU/WH) And Battery Positive
      G06064792Courtesy of FORD MOTOR CO.
    • For DTC B29B7 or DTC B29B8, connect a fused jumper wire between the SJB C2280b-52, circuit VLN04 (VT/GY) and battery positive.
      Fig 2: Connecting Fused Jumper Wire Between SJB C2280b-52, Circuit VLN37 (BU/WH) And Battery Positive
      G06075396Courtesy of FORD MOTOR CO.
    • Do(es) the backlighting component(s) illuminate? 
      • Yes  : REMOVE the jumper wire. GO to  B5.
      • No  : For Navigator, if the auxiliary climate control is inoperative, REMOVE the jumper wire. GO to B3.

        For all others, REMOVE the jumper wire. REPAIR circuit VLN18 (BU/WH) or circuit VLN04 (VT/GY) for an open. CLEAR the DTCs. REPEAT the self-test.

  3. B3 CHECK FOR VOLTAGE TO THE AUXILIARY CLIMATE CONTROL MODULE 
    • Connect: SJB C2280b.
    • Disconnect: Auxiliary Climate Control Assembly C3198.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Measure the voltage between the auxiliary climate control assembly C3198-1, circuit VLN18 (BU/WH), harness side and ground.
      Fig 3: Measuring Voltage Between Auxiliary Climate Control Assembly C3198-1, Circuit VLN18 (BU/WH) And Ground
      G06133389Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : GO to B4.
      • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. B4 CHECK FOR VOLTAGE TO THE AUXILIARY CLIMATE CONTROL MODULE USING THE CONNECTOR GROUND 
    • Measure the voltage between the auxiliary climate control assembly C3198-1, circuit VLN18 (BU/WH), harness side and the auxiliary climate control assembly C3198-3, circuit GD143 (BK/VT), harness side.
      Fig 4: Measuring Voltage Between Auxiliary Climate Control Assembly C3198-3, Circuit VLN18 (BU/WH) And Auxiliary Climate Control Assembly C3198-3
      G06133390Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : INSTALL a new auxiliary climate control assembly. REFER to AUXILIARY CLIMATE CONTROL . CLEAR the DTCs. REPEAT the self-test.
      • No  : REPAIR circuit GD143 (BK/VT) for an open. CLEAR the DTCs. REPEAT the self-test.
  5. B5 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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