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.
Circuit/System Verification
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, verify that all manual power seat functions operate when being controlled by the seat adjuster switches.
- If all seat functions do not operate, refer to Power Seat Inoperative (Without Memory A45 ) or Power Seat Inoperative (With Memory A45) .
- Ignition ON, observe the scan tool Memory Seat Module Lumbar Switch parameters while pressing the appropriate lumbar switch. The reading should change between Inactive and Active.
- If the reading does not change between the specified values, refer to Lumbar Switch Circuit Test .
- If all lumbar switch inputs to the MSM function normal, refer to Lumbar Motor Control Circuit Test .
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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.