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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 163 (Instrument Cluster Illumination And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test B: All Dimmable Illumination Does Not Dim >> Pinpoint Test B: All DIMMABLE Illumination Does Not Dim

Pinpoint Test B: All DIMMABLE Illumination Does Not Dim

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
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 THE INSTRUMENT PANEL DIMMER SWITCH 
    • Ignition OFF.
    • Disconnect: Instrument Panel Dimmer Switch C2298.
    • Carry out the component test for the instrument panel dimmer switch. Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for component testing.
    • Is the instrument panel dimmer switch OK? 
    • Yes  : GO to B2.
    • No  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . CLEAR the DTCs. REPEAT the self-test.
  2. B2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280b.
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch C2298-1, circuit VLN18 (BU/WH), harness side and ground.
      Fig 1: Measuring Voltage Between Instrument Panel Dimmer Switch C2298- 1, Circuit VLN18 (BU/WH) And Ground
      G06141618Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR circuit VLN18 (BU/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to B3.
  3. B3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the instrument panel dimmer switch C2298-4, circuit RLN29 (WH/OG), harness side and ground.
      Fig 2: Measuring Voltage Between Instrument Panel Dimmer Switch C2298- 4, Circuit RLN29 (WH/OG) And Ground
      G06141619Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR circuit RLN29 (WH/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to B4.
  4. B4 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between the instrument panel dimmer switch C2298-1, circuit VLN18 (BU/WH), harness side and ground.
      Fig 3: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-1, Circuit VLN18 (BU/WH) And Ground
      G06141622Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to B5.
    • No  : REPAIR circuit VLN18 (BU/WH) for a short to ground. TEST the system for normal operation.
  5. B5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUIT FOR AN OPEN 
    • Measure the resistance between the instrument panel dimmer switch C2298-1, circuit VLN18 (BU/WH), harness side and the SJB C2280b-34, circuit VLN18 (BU/WH), harness side.
      Fig 4: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-1, Circuit VLN18 (BU/WH) And SJB C2280B-34, Circuit VLN18 (BU/WH)
      G06141620Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to B6.
    • No  : REPAIR circuit VLN18 (BU/WH) for an open. CLEAR the DTCs. REPEAT the self-test.
  6. B6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR AN OPEN 
    • Measure the resistance between the instrument panel dimmer switch C2298-4, circuit RLN29 (WH/OG), harness side and the SJB C2280b-33, circuit RLN29 (WH/OG), harness side.
      Fig 5: Checking Instrument Panel Dimmer Switch Return Circuit For Open
      G06141621Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to B7.
    • No  : REPAIR circuit RLN29 (WH/OG) for an open. CLEAR the DTCs. REPEAT the self-test.
  7. B7 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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