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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 C2298.

    • Ignition ON.

    • Using a scan tool, clear the DTCs and perform the SCCM self-test.

    Is DTC B1124:09 still present? 

    Yes  GO to  A3.
    No  INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch .

  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
      C2298-2 VLN36 (GY/OG) -- Ground
      C2298-3 CLN56 (BN/VT) -- Ground
      C2298-7 CLN55 (YE/VT) -- Ground

    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

    • Disconnect: Instrument Panel Dimmer Switch C2298.

    • Carry out the instrument panel dimmer switch component test. Refer to Component Testing for component testing.

    Is the instrument panel dimmer switch OK? 

    Yes  GO to  A5.
    No  INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch .

  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
      C2298-3 CLN56 (BN/VT) -- Ground
      C2298-7 CLN55 (YE/VT) -- Ground

    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) C2298-3 CLN56 (BN/VT)
      C2414A-18 CLN55 (YE/VT) C2298-7 CLN55 (YE/VT)

    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
      C2298-2 VLN36 (GY/OG) -- Ground
      C2298-3 CLN56 (BN/VT) -- Ground
      C2298-4 RLN29 (WH/OG) -- Ground
      C2298-7 CLN55 (YE/VT) -- Ground

    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) C2298-4 RLN29 (WH/OG)

    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

    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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