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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISBODY & FRAMESEATSPOWER SEAT SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESLUMBAR SUPPORT INOPERATIVE (WITHOUT MEMORY A45)CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the lumbar switch.
- Test for less than 5 ohms between the ground circuit terminal E and ground.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- 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.
- Ignition OFF, connect the harness connector at the lumbar switch and disconnect the harness connector at the lumbar adjuster motor assembly.
- Ignition ON, verify that the test lamp illuminates between the appropriate control circuits listed below while pressing the lumbar switch in both directions.
- Lumbar horizontal motor terminal C and terminal D
- Lumbar vertical motor terminal A and terminal B
- If the test lamp does not illuminate for both directions, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the lumbar switch.
- 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.