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Pinpoint Test C: All Instrument Panel Illumination Does Not Dim

CAUTION: 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? 
    1. YES  : Go to  C2.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  2. C2 CHECK THE RECORDED RESULTS FROM THE CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Check for recorded DTCs from the continuous and on-demand self-tests.
    • Are any DTCs present? 
    1. YES  : If DTC B2212 is retrieved, go to  C4.

      For all other DTCs, REFER to MULTIFUNCTION ELECTRONIC MODULES article.

    2. NO  : Go to  C3.
  3. C3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • Monitor the SJB PID (DIM_SW_3) while rotating the instrument panel dimmer switch from the lowest setting to the highest setting.
    • Does the PID indicate the switch is operating correctly? 
    1. YES  : Go to  C9.
    2. NO  : INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch . TEST the system for normal operation.
  4. C4 CHECK CIRCUIT CLN27 (WH/BN) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280b
    • Disconnect: Instrument Panel Dimmer Switch C2065
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Instrument Panel Dimmer Switch C2298-4, Circuit CLN27 (WH/BN) & Ground
      GF0032203Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument panel dimmer switch C2065-4, circuit CLN27 (WH/BN), harness side and ground.
    • Is any voltage indicated? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  C5.
  5. C5 CHECK CIRCUIT VLN18 (BU/WH) FOR A SHORT TO VOLTAGE 
      Fig 2: Measuring Voltage Between Instrument Panel Dimmer Switch C2298-6, Circuit VLN18 (BU/WH) & Ground
      GF0032204Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument panel dimmer switch C2065-6, circuit VLN18 (BU/WH), harness side and ground.
    • Is any voltage indicated? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  C6.
  6. C6 CHECK CIRCUIT CLN27 (WH/BN) FOR AN OPEN OR A SHORT TO GROUND 
      Fig 3: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-4, Circuit CLN27 (WH/BN) & SJB C2280B-33
      GF0032205Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C2065-4, circuit CLN27 (WH/BN), harness side and the SJB C2280b-33, circuit CLN27 (WH/BN), harness side; and between the instrument panel dimmer switch C2065-4, circuit CLN27 (WH/BN), harness side and ground.
    • 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? 
    1. YES  : Go to  C7.
    2. 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 
      Fig 4: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-6, Circuit VLN18 (BU/WH) & SJB C2280B-34
      GF0032206Courtesy of FORD MOTOR CO.
    • 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.
    • 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? 
    1. YES  : Go to  C8.
    2. 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 appropriate COMPONENT TESTING article.
    • Is the instrument panel dimmer switch OK? 
    1. YES  : Go to  C9.
    2. 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? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. 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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