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Pinpoint Test B: The Instrument Panel Illumination Does Not Dim

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. B1 MONITOR THE INSTRUMENT PANEL ILLUMINATION OPERATION 
    • With the parking lamps ON, rotate the dimmer switch from maximum brightness to minimum brightness.
    • Monitor all instrument panel illumination sources for correct operation.
    • Do all the dimmable instrument panel illumination sources dim correctly? 

    Yes  : The system is OK.

    No  : If only the instrument cluster does not dim, INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.

    For all others, GO to  B2.

  2. B2 CHECK THE SJB INSTRUMENT PANEL DIMMER SWITCH PIDs 
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: SJB Instrument Panel Dimmer Switch PIDs.
    • Turn the parking lamps ON.
    • Monitor the SJB instrument panel dimmer switch PIDs while rotating the instrument panel dimmer switch from full OFF to full ON.
    • Do the SJB instrument panel dimmer switch PIDs agree with the instrument panel dimmer switch position? 

    Yes  : GO to  B8.

    No  : GO to  B3.

  3. B3 CHECK CIRCUIT 1036 (BN/WH) FOR AN OPEN AND A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280b.
    • Disconnect: Instrument Panel Dimmer Switch C2298.
    • Measure the resistance between the SJB C2280b-32, circuit 1036 (BN/WH), harness side and the instrument panel dimmer switch C2298-1, circuit 1036 (BN/WH), harness side; and between the SJB C2280b-32, circuit 1036 (BN/WH), harness side and ground.
      Fig 1: Checking Circuit 1036 (BN/WH) For Open And Short To Ground
      G04697505
    • Is the resistance less than 5 ohms between the SJB and the instrument panel dimmer switch, and greater than 10,000 ohms between the SJB and ground? 

    Yes  : GO to  B4.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  4. B4 CHECK CIRCUIT 1405 (LB/BK) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the SJB C2280b-1, circuit 1405 (LB/BK), harness side and ground.
      Fig 2: Checking Voltage Between SJB C2280B-1, Circuit 1405 (LB/BK) And Ground
      G04697506
    • Is any voltage indicated? 

    Yes  : GO to  B5.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  5. B5 CHECK CIRCUIT 1035 (OG/RD) FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the SJB C2280b-43, circuit 1035 (OG/RD), harness side and ground.
      Fig 3: Checking Voltage Between SJB C2280B-43, Circuit 1035 (OG/RD), And Ground
      G04697507
    • Is any voltage indicated? 

    Yes  : GO to  B6.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  6. B6 CHECK CIRCUIT 1035 (OG/RD) FOR AN OPEN AND A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the SJB 32280b-43, circuit 1035 (OG/RD), harness side and the instrument panel dimmer switch C2298-6, circuit 1035 (OG/RD), harness side; and between the SJB C2280b-43, circuit 1035 (OG/RD), harness side and ground.
      Fig 4: Checking Circuit 1035 (OG/RD) For Open And Short To Ground
      G04697508
    • Is the resistance less than 5 ohms between the SJB and the instrument panel dimmer switch, and greater than 10,000 ohms between the SJB and ground? 

    Yes  : GO to  B7.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  7. B7 CHECK THE INSTRUMENT PANEL DIMMER SWITCH OPERATION 
    • Carry out the instrument panel dimmer switch component test, Refer to COMPONENT TESTING for component testing.
    • Does the instrument panel dimmer switch pass the component test? 

    Yes  : GO to  B8.

    No  : INSTALL a new instrument panel dimmer switch. REFER to EXTERIOR LIGHTING . CLEAR the DTCs. REPEAT the self-test.

  8. B8 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • 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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