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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 706 (SEAT SYSTEM)DESCRIPTION AND OPERATIONLUMBAR SUPPORT DESCRIPTION AND OPERATIONNOTES
1999 GMC Forward Control 5.7 R, Automatic
Lumbar Support Description and Operation: Notes
1999 GMC Forward Control 5.7 R, AutomaticSECTION Notes
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The lumbar support system consists of the following components:
- Seat Lumbar Switch
- Seat Lumbar Horizontal Adjuster Relay
- Seat Lumbar Vertical Adjuster Relay
- Seat Lumbar Horizontal Motor
- Seat Lumbar Vertical Motor
- H SEAT LUM Fuse 15 A
- SEAT Circuit Breaker 20 A
RENDER: 1.0x
NO RELATED
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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.