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 4.3 W, STANDARDREPAIR AND DIAGNOSISBODY & FRAMESEATSPOWER SEAT SYSTEMSYMPTOM TESTSPOWER SEAT INOPERATIVE
1999 GMC Forward Control 4.3 W, Standard
Power Seat Inoperative
1999 GMC Forward Control 4.3 W, StandardSECTION Power Seat Inoperative
- Perform POWER SEAT SYSTEM CHECK under TROUBLE SHOOTING. Go to next step.
- At inoperative seat, disconnect power seat switch 2-pin connector C-1. Connect test light between power seat switch connector C-1, terminal "A" (Orange wire) and ground. See WIRING DIAGRAMS . If test light comes on, go to step 4 . If test light does not come on, go to next step.
- Repair open in Orange wire between power seat switch and instrument panel fuse block. If suspect power seat is still inoperative, go to next step. If suspect power seat is okay, go to POWER SEAT SYSTEM CHECK under TROUBLE SHOOTING.
- Using DVOM, check for continuity between power seat switch harness connector C-1, terminal "B" (Black wire) and ground. If continuity is indicated, go to next step. If continuity is not indicated, go to step 6 .
- Replace suspect power seat switch. See POWER SEAT ADJUSTER SWITCH under REMOVAL & INSTALLATION. After repairs, go to POWER SEAT SYSTEM CHECK under TROUBLE SHOOTING.
- Repair open in Black wire between power seat switch and ground. After repairs, go to POWER SEAT SYSTEM CHECK under TROUBLE SHOOTING.
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.