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 763 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESLUMBAR SUPPORT INOPERATIVE (WITH MEMORY A45)COMPONENT TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Component Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Component Testing
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.
Lumbar Switch
- Ignition OFF, disconnect the harness connector at the lumbar switch.
- Test for infinite resistance between each lumbar direction signal terminal listed below and the B+ terminal G with the switch in the open position.
- Lumbar horizontal forward switch terminal B
- Lumbar horizontal rearward switch terminal C
- Lumbar vertical upward switch terminal F
- Lumbar vertical downward switch terminal A
- If not the specified value, replace the lumbar switch.
- Test for less than 1 ohm between each lumbar direction signal terminal listed below and the B+ terminal G with the switch in the closed position.
- Lumbar horizontal forward switch terminal B
- Lumbar horizontal rearward switch terminal C
- Lumbar vertical upward switch terminal F
- Lumbar vertical downward switch terminal A
- If greater than the specified range, replace the lumbar switch.
RENDER: 1.0x
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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.