System Operation Check

1999 GMC Forward Control 5.7 R, AutomaticSECTION System Operation Check
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Savana Special, 1996 GMC Savana Camper Special, and 1996 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.

If system is functioning normally, air bag warning light will flash 7 times and then go out when ignition switch is turned to ON position.

Four possible warning light conditions can indicate a system failure:

  • Light does not illuminate at all.
  • Light comes on while vehicle is driven.
  • Light flashes 7 times, and remains on.
  • Light does not flash but remains lit when ignition is turned on.

SIR system faults are usually due to a disconnected/loose electrical connector caused by previous service on vehicle. Always check YellowΒ  SIR connector at base of steering column for loose or damaged wiring.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.