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 PROCEDURESTURN SIGNAL LAMPS AND/OR INDICATORS 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 scan tool Left Turn Signal Switch parameter while using the turn signal/multifunction switch to turn the left turn signal ON and OFF. The reading should change between Active and Inactive.
- If the readings do not change between the specified values, refer to Turn Signal/Multifunction Switch Circuit Test .
- Ignition ON, observe the scan tool Right Turn Signal Switch parameter while using the turn signal/multifunction switch to turn the right turn signal ON and OFF. The reading should change between Active and Inactive.
- If the readings do not change between the specified values, refer to Turn Signal/Multifunction Switch Circuit Test .
- Command the following turn signals ON and OFF with a scan tool. The respective turn signal should illuminate.
- LF Turn Signal
- RF Turn Signal
- LR Turn Signal
- RR Turn Signal
- If the turn signal does not illuminate or the outside rearview mirror turn signal does not illuminate, refer to Turn Signal Circuit Malfunction .
- With the turn signal/multifunction switch in the left turn position, verify the left turn signal indicator is illuminated on the IPC.
- If the turn signal indicator does not illuminate, refer to Turn Signal Indicators Malfunction .
- With the turn signal/multifunction switch in the right turn position, verify the right turn signal indicator is illuminated on the IPC.
- If the turn signal indicator does not illuminate, refer to Turn Signal Indicators 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.