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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 4.3 W, STANDARDREPAIR AND DIAGNOSISBODY & FRAMESEATSPOWER SEAT SYSTEMTROUBLE SHOOTINGPRELIMINARY CHECKS
1999 GMC Forward Control 4.3 W, Standard

Preliminary Checks

1999 GMC Forward Control 4.3 W, StandardSECTION Preliminary Checks
  1. Check PWR ACCY circuit breaker (20 or 30-amp) or POWER ACC fuse (25-amp), located in instrument panel fuse block.
  2. Ensure terminal contact and ground connections are clean and tight. Check for proper installation of aftermarket electronic equipment.
  3. Check for any obstruction under seat or carriages which may affect power seat operation.
  4. If seat motor internal circuit breaker is tripped, remove voltage from motor to reset.
  5. Check for broken or partially broken wire inside of insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. These circuits may be intermittent or resistive when loaded.
  6. If motors operate but seat does not move, check for obstruction in seat drive rail or check for broken drive gear. If seat tilts forward and/or rearward but does not move up or down, replace power seat switch.
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.