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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 731 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESINTERIOR BACKLIGHTING MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Verification

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is activated.
    • If the reading does not change, refer to Dimmer Switch Malfunction below.
  2. Observe the function of the backlighting components while commanding the LED Dimming or Incandescent Dimming ON and OFF with a scan tool. The backlighting components should turn ON and OFF while changing between the commanded states.
    • If the backlighting components do not turn ON and OFF, refer to Interior Backlighting Malfunction below.
  3. Observe the driver door switch while commanding the Integrated Sw. Backlighting Test ON and OFF with a scan tool. The driver door switch backlighting should turn ON and OFF when changing between the commanded states.
    • If the driver door switch backlighting does not operate as described, replace the driver door lock and side window switch.
  4. Observe the driver memory/heated seat switch while commanding the Non-Integrated Backlighting Test ON and OFF with a scan tool. The driver memory/heated seat switch backlighting should turn ON and OFF when changing between the commanded states.
    • If the driver memory/heated seat switch backlighting does not operate as described, refer to Front Door Switch Backlighting Malfunction below.
  5. Observe the passenger door switch while commanding the Integrated Sw. Backlighting Test ON and OFF with a scan tool. The passenger door switch backlighting should turn ON and OFF when changing between the commanded states.
    • If the passenger door switch backlighting does not operate as described, replace the passenger door lock and side window switch.
  6. Observe the passenger memory/heated seat switch while commanding the Non-Integrated Backlighting Test ON and OFF with a scan tool. The passenger memory/heated seat switch backlighting should turn ON and OFF when changing between the commanded states.
    • If the passenger memory/heated seat switch backlighting does not operate as described, refer to Front Door Switch Backlighting Malfunction below.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.