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Pinpoint Test C: All Control Illumination Does Not Dim

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. C1 CHECK THE EXTERIOR LIGHTING OPERATION 
    • Place the headlamp switch in each of its positions while observing the exterior lamps.
    • Do the exterior lamps operate correctly? 

    Result/Action to Take 

  2. C2 CHECK THE RECORDED RESULTS FROM BOTH CONTINUOUS AND ONDEMAND SJB SELF-TESTS 
    • Check for recorded DTCs from the continuous and on-demand SJB  self-tests.
    • Is DTC B2212 present? 
    • Yes:  GO to  C5.
    • No:  GO to C3  .
  3. C3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB  DataLogger.
    • Monitor the SJB  dimmer switch PID (DIM_SW3) while rotating the instrument panel dimmer switch from the lowest setting to the highest setting.
    • Does the PID indicate the switch is operating correctly? 
    • Yes:  GO to C4  .
    • No:  GO to  C9.
  4. C4 CHECK CIRCUIT RLN29 (WH/OG) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB  C2280b.
    • Disconnect: Instrument Panel Dimmer Switch C2065.
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side and ground.
      Fig 1: Measuring Voltage Between Instrument Panel Dimmer Switch C2065-4, Circuit RLN29 (WH/OG) And Ground
      G06064793Courtesy of FORD MOTOR CO.
    • Is any voltage indicated? 
    • Yes:  REPAIR circuit RLN29 (WH/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to C5  .
  5. C5 CHECK CIRCUIT VLN18 (BU/WH) FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the instrument panel dimmer switch C2065-6, circuit VLN18 (BU/WH), harness side and ground.
      Fig 2: Measuring Voltage Between Instrument Panel Dimmer Switch C2065-6, Circuit VLN18 (BU/WH) And Ground
      G06064794Courtesy of FORD MOTOR CO.
    • Is any voltage indicated? 
    • Yes:  REPAIR circuit VLN18 (BU/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to C6  .
  6. C6 CHECK CIRCUIT RLN29 (WH/OG) FOR AN OPEN OR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side and the SJB  C2280b-33, circuit RLN29 (WH/OG), harness side; and between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side and ground.
      Fig 3: Checking Circuit RLN29 (WH/OG) For An Open Or Short To Ground
      G06075399Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument panel dimmer switch and the SJB  , and greater than 10,000 ohms between the instrument panel dimmer switch and ground? 
    • Yes:  GO to C7  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  7. C7 CHECK CIRCUIT VLN18 (BU/WH) FOR AN OPEN OR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB  C2280b.
    • Disconnect: Instrument Panel Dimmer Switch C2065.
    • Measure the resistance between the instrument panel dimmer switch C2065-6, circuit VLN18 (BU/WH), harness side and the SJB  C2280b-34, circuit VLN18 (BU/WH), harness side; and between the instrument panel dimmer switch C2065-6, circuit VLN18 (BU/WH), harness side and ground.
      Fig 4: Checking Circuit VLN18 (BU/WH) For An Open Or Short To Ground
      G06075400Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument panel dimmer switch and the SJB  , and greater than 10,000 ohms between the instrument panel dimmer switch and ground? 
    • Yes:  GO to C8  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  8. C8 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Carry out the component test for the instrument panel dimmer switch.

      Refer to SYSTEM WIRING DIAGRAMS for component testing.

    • Is the instrument panel dimmer switch OK? 
    • Yes:  GO to C9  .
    • No:  INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.
  9. C9 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. CLEAR the DTCs. REPEAT the self-test.
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