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Pinpoint Test A: All DIMMABLE Illumination Does Not Dim

  1. A1 CHECK THE RECORDED RESULTS FROM THE SCCM ON-DEMAND SELF-TEST 
    • Ignition ON.
    • Using a scan tool, perform the SCCM  self-test.

    Is DTC B1124:09 present? 

    • Yes  : GO to A2  .
    • No  : GO to  A4.
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Ignition OFF.
    • Disconnect: Instrument Panel Dimmer Switch C2065  .
    • Ignition ON.
    • Using a scan tool, clear the DTCs and perform the SCCM  self-test.

    Is DTC B1124:09 still present? 

  3. A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SCCM C2414A  .
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2065-2  VLN36 (GY/OG) - Ground
      C2065-3  CLN56 (BN/VT) - Ground
      C2065-7  CLN55 (YE/VT) - Ground
      Fig 1: Identifying Instrument Panel Dimmer Switch Connector Pins
      G09572937Courtesy of FORD MOTOR CO.

    Are the resistances greater than 10, 000 ohms? 

    • Yes  : GO to  A9.
    • No  : REPAIR the affected circuit.
  4. A4 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 

    Is the instrument panel dimmer switch OK? 

  5. A5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH UP AND DOWN INPUT CIRCUITS FOR VOLTAGE 
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2065-3  CLN56 (BN/VT) - Ground
      C2065-7  CLN55 (YE/VT) - Ground
      Fig 2: Identifying Instrument Panel Dimmer Switch Connector Pins
      G09572938Courtesy of FORD MOTOR CO.

    Are the voltages greater than 5 volts? 

    • Yes  : GO to  A7.
    • No  : GO to A6  .
  6. A6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH UP AND DOWN INPUT CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: SCCM C2414A  .
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2414A-17  CLN56 (BN/VT) C2065-3  CLN56 (BN/VT)
      C2414A-18  CLN55 (YE/VT) C2065-7  CLN55 (YE/VT)
      Fig 3: Checking Instrument Panel Dimmer Switch
      G08616662Courtesy of FORD MOTOR CO.

    Are the resistances less than 3 ohms? 

    • Yes  : GO to  A9.
    • No  : REPAIR the affected circuit.
  7. A7 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT AND RETURN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SCCM C2414A  .
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2065-2  VLN36 (GY/OG) - Ground
      C2065-3  CLN56 (BN/VT) - Ground
      C2065-4  RLN29 (WH/OG) - Ground
      C2065-7  CLN55 (YE/VT) - Ground
      Fig 4: Identifying Instrument Panel Dimmer Switch Connector Pins
      G09572940Courtesy of FORD MOTOR CO.

    Is any voltage present? 

    • Yes  : REPAIR the affected circuit.
    • No  : GO to A8  .
  8. A8 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2414A-15  RLN29 (WH/OG) C2065-4  RLN29 (WH/OG)
      Fig 5: Checking Instrument Panel Dimmer Switch
      G08616662Courtesy of FORD MOTOR CO.

    Is the resistance less than 3 ohms? 

    • Yes  : GO to A9  .
    • No  : REPAIR the circuit.
  9. A9 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT AND RETURN CIRCUITS FOR A SHORT TOGETHER 
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2065-2  VLN36 (GY/OG) C2065-3  CLN56 (BN/VT)
      C2065-2  VLN36 (GY/OG) C2065-4  RLN29 (WH/OG)
      C2065-2  VLN36 (GY/OG) C2065-7  CLN55 (YE/VT)
      C2065-3  CLN56 (BN/VT) C2065-4  RLN29 (WH/OG)
      C2065-3  CLN56 (BN/VT) C2065-7  CLN55 (YE/VT)
      C2065-4  RLN29 (WH/OG) C2065-7  CLN55 (YE/VT)
      Fig 6: Identifying Instrument Panel Dimmer Switch Connector Pins
      G09572942Courtesy of FORD MOTOR CO.

    Are the resistances greater than 10, 000 ohms? 

    • Yes  : GO to A10  .
    • No  : REPAIR the affected circuits.
  10. A10 CHECK FOR CORRECT SCCM OPERATION 
    • Disconnect and inspect all the SCCM  connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the SCCM  connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    • Yes  : CHECK On-Line Automotive Service Information System (OASIS) for any applicable TSBs  . If a TSB  exists for this concern, DISCONTINUE this test and FOLLOW TSB  instructions. If no TSBs  address this concern, INSTALL a new SCCM  . REFER to STEERING COLUMN SWITCHES .
    • No  : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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