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 G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1657 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESLUMBAR SUPPORT INOPERATIVE (WITHOUT MEMORY A45)COMPONENT TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Component Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Component Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. 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 seat 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.
- Test for less than 1 ohm between each lumbar direction signal terminal listed below and the ground terminal E 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 greater than the specified range, replace the lumbar switch.
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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.