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Home >> Lincoln >> 2014 >> Navigator Base, 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. If OK, GO to B2  .

      If not OK, REFER to the OEM WIRING DIAGRAMS 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 REMOVAL AND INSTALLATION .TEST the system for normal operation.

  2. B2 BYPASS THE SJB 
    NOTE: If the jumper wire fails, refer to the OEM WIRING DIAGRAMS 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 DIAGNOSIS AND TESTING .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 SJB 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 VLN04 (VT/GY) 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 C3198-1, 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 Assembly . 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 REMOVAL AND 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. 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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