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 2432 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESLUMBAR SUPPORT INOPERATIVE (WITH MEMORY A45)CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
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Lumbar Switch Circuit Test
- Ignition OFF, disconnect the harness connector at the lumbar switch.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
- Verify that all scan tool Memory Seat Module lumbar switch parameters are Inactive.
- If not the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
- Lumbar horizontal forward terminal C
- Lumbar horizontal rearward terminal B
- Lumbar vertical upward terminal F
- Lumbar vertical downward terminal A
- Install a 3A fused jumper wire between the appropriate signal circuit listed below and the B+ circuit terminal G. Verify the scan tool Lumbar Switch parameter is Active.
- Lumbar horizontal forward terminal C
- Lumbar horizontal rearward terminal B
- Lumbar vertical upward terminal F
- Lumbar vertical downward terminal A
- If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
- If all circuits test normal, test or replace the lumbar switch.
Lumbar Motor Control Circuit Test
- Ignition OFF, disconnect the X1 harness connector at the lumbar adjuster motor assembly.
- Connect a test lamp between the appropriate control circuits listed below:
- Lumbar horizontal motor terminal C and terminal D
- Lumbar vertical motor terminal A and terminal B
- Ignition ON, command the appropriate lumbar motor in the Up/Down or Forward/Rearward directions with a scan tool. The test lamp should turn ON when commanding the up and down or forward and rearward states.
- If the test lamp remains OFF during either of the commands, test the control circuits for an open/high resistance. If the circuits test normal replace the MSM.
- If all circuits test normal, test or replace the lumbar adjuster 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.