Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 492 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESSTOP LAMPS 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 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the rear turn signals while commanding the left and right turn signals ON and OFF with a scan tool. The left and right rear turn signals should illuminate and flash when commanded ON.
- If the rear turn signals do not operate as specified, refer to Turn Signal Lamps and/or Indicators Malfunction .
- Ignition ON, observe the scan tool Stop Lamp Switch Status parameter while the brake pedal is applied. The reading should change from 1023 Counts to 1 Count as the brake pedal is applied.
- If the Stop Lamp Switch Status reading does not change between the specified values, refer to the Stop Lamp Switch Malfunction .
- Observe the stop lamps as the brake pedal is applied and released. The stop lamps should turn ON and OFF as the brake pedal is applied and released.
- If one or more stop lamps do not illuminate, refer to appropriate Stop Lamp Malfunction
- If the stop lamps illuminate, but the CHMSL does not illuminate, refer to the Center High Mounted Stop Lamp Malfunction .
- Ignition ON, with a test lamp connected to ground, probe each of the test points on the AUX STOP LAMP fuse while pressing and releasing the brake pedal. The test lamp should turn ON and OFF at one or both of the fuse test points.
- If the test lamp does not turn ON or remains ON at either test point, refer to the Auxiliary Stop Lamps PCB Relay Test .
- If the test lamp turns ON and OFF as the brake pedal is pressed and released, but the auxiliary stop lamps are inoperative, refer to the Auxiliary Stop Lamp Malfunction .
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When to See a Mechanic
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.