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 DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESSTOP LAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTINGSTOP LAMPS CIRCUIT TEST
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Stop Lamps Circuit Test
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Stop Lamps Circuit Test
- Ignition ON, with a test lamp connected to ground, probe each of the test points on the Stop Lamp fuse while pressing and releasing the brake pedal. The test lamp should illuminate at one or both of the fuse test points.
- If the test lamp does not illuminate or remains illuminated at either test point, refer to Stop Lamps PCB Relay Test .
- Ignition OFF, disconnect harness connector at the inoperative stop/turn lamp assembly.
- Ignition OFF, test for less than 5.0 ohms of resistance between the ground circuit terminal G and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Connect a test lamp between the supply voltage circuit terminal A and ground.
- Ignition ON, command the appropriate LR or RR Turn Signal ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, replace the inoperative stop/turn signal lamp assembly.
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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.