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Home >> Lincoln >> 2012 >> MKS Base, FWD >> 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 A: All Dimmable Illumination Does Not Dim >> Pinpoint Test A: All DIMMABLE Illumination Does Not Dim

Pinpoint Test A: All DIMMABLE 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. A1 CHECK THE RECORDED RESULTS FROM THE SJB ON-DEMAND SELF-TEST 
    • Ignition OFF.
    • Review the recorded results from the SJB on-demand self-test.
    • Is DTC B1685, B1688 or B213A present? 
      • Yes  : GO to A2.
      • No  : GO to  A6.
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Disconnect: Instrument Panel Dimmer Switch C2065.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB Self-Test.
    • Clear the DTCs and repeat the SJB self-test.
    • Is the DTC still present? 
      • Yes  : GO to A3.
      • No  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.
  3. A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM DOWN CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280B.
    • Measure the resistance between the instrument panel dimmer switch C2065-7, circuit CLN56 (BN/VT), harness side and ground.
      Fig 1: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-7, Circuit CLN56 (BN/VT) And Ground
      G06757127Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to A4.
      • No  : REPAIR circuit CLN56 (BN/VT) for a short to ground. TEST the system for normal operation.
  4. A4 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM UP CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the instrument panel dimmer switch C2065-3, circuit CLN55 (YE/VT), harness side and ground.
      Fig 2: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-3, Circuit CLN55 (YE/VT) And Ground
      G06757128Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to A5.
      • No  : REPAIR circuit CLN55 (YE/VT) for a short to ground. TEST the system for normal operation.
  5. A5 CHECK THE DOME LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the instrument panel dimmer switch C2065-2, circuit CLN28 (GN/BU), harness side and ground.
      Fig 3: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-2, Circuit CLN28 (GN/BU) And Ground
      G06757129Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to  A12.
      • No  : REPAIR circuit CLN28 (GN/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  6. A6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280B.
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side and ground.
      Fig 4: Measuring Voltage Between Instrument Panel Dimmer Switch C2065-4, Circuit RLN29 (WH/OG) And Ground
      G06757130Courtesy 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 A7.
  7. A7 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM DOWN CIRCUIT FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the instrument panel dimmer switch C2065-7, circuit CLN56 (BN/VT), harness side and ground.
      Fig 5: Measuring Voltage Between Instrument Panel Dimmer Switch C2065-7, Circuit CLN56 (BN/VT) And Ground
      G06757131Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR circuit CLN56 (BN/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
      • No  : GO to A8.
  8. A8 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM UP CIRCUIT FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the instrument panel dimmer switch C2065-3, circuit CLN55 (YE/VT), harness side and ground.
      Fig 6: Measuring Voltage Between Instrument Panel Dimmer Switch C2065-3, Circuit CLN55 (YE/VT) And Ground
      G06757132Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR circuit CLN55 (YE/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
      • No  : GO to A9.
  9. A9 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR AN OPEN 
    • 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.
      Fig 7: Checking Instrument Panel Dimmer Switch Return Circuit For Open
      G06260871Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to A10.
      • No  : REPAIR circuit RLN29 (WH/OG) for an open. CLEAR the DTCs. REPEAT the self-test.
  10. A10 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM DOWN CIRCUIT FOR AN OPEN 
    • Measure the resistance between the instrument panel dimmer switch C2065-7, circuit CLN56 (BN/VT), harness side and the SJB C2280B-36, circuit CLN56 (BN/VT), harness side.
      Fig 8: Checking Instrument Panel Dimmer Switch Dim Down Circuit For Open
      G06757134Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to A11.
      • No  : REPAIR circuit CLN56 (BN/VT) for an open. CLEAR the DTCs. REPEAT the self-test.
  11. A11 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM UP CIRCUIT FOR AN OPEN 
    • Measure the resistance between the instrument panel dimmer switch C2065-3, circuit CLN55 (YE/VT), harness side and the SJB C2280B-28, circuit CLN55 (YE/VT), harness side.
      Fig 9: Checking Instrument Panel Dimmer Switch Dim Up Circuit For Open
      G06757135Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to A12.
      • No  : REPAIR circuit CLN55 (YE/VT) for an open. CLEAR the DTCs. REPEAT the self-test.
  12. A12 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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