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Home >> Ford >> 2007 >> Expedition RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster System And Panel Illumination >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test C: All Instrument Panel Illumination Does Not Dim >> Pinpoint Test C: All Instrument Panel Illumination Does Not Dim

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.
NOTE: Calibrate the instrument panel dimmer switch by rotating the dimmer switch from the full dim position to the dome ON position before continuing diagnostics.
  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 BOTH 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: DataLogger
    • Monitor the SJB PID BACK_LT 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 . CLEAR the DTCs. REPEAT the self-test.
  4. C4 CHECK CIRCUIT RLN29 (WH/OG) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280e
    • Disconnect: Instrument Panel Dimmer Switch C2065
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0023322Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), 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 CLN27 (WH/BN) FOR A SHORT TO VOLTAGE 
      Fig 2: Checking Circuit For Voltage
      GF0023323Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument panel dimmer switch C2065-6, 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  C6.
  6. C6 CHECK CIRCUIT RLN29 (WH/OG) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 3: Checking Circuit For Open Or Short To Ground
      GF0023324Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side and the SJB C2280e-33, circuit RLN29 (WH/OG), harness side; and between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), 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 CLN27 (WH/BN) FOR AN OPEN OR A SHORT TO GROUND 
      Fig 4: Checking Circuit For Open Or Short To Ground
      GF0023325Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C2065-6, circuit CLN27 (WH/BN), harness side and the SJB C2280e-34, circuit CLN27 (WH/BN), harness side; and between the instrument panel dimmer switch C2065-6, 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  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 COMPONENT TESTING.
    • 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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