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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> 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  in this service information. 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 -- MKS article. 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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