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 7 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DISPOSAL PROCEDURESOFF-VEHICLE DEPLOYMENT
1999 GMC Forward Control 5.7 R, Automatic
Off-Vehicle Deployment
1999 GMC Forward Control 5.7 R, AutomaticSECTION Off-Vehicle Deployment
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.
- Turn ignition switch to LOCK position. Short the two deployment harness (J-38826) leads together by fully seating one banana plug into the other. Connect pigtail adapter to SIR deployment harness.
- Remove driver-side air bag module. See AIR BAG MODULE under REMOVAL & INSTALLATION. Place air bag module on a work bench with trim cover facing up.
- Place air bag module on ground (preferably outdoors) at least 6 feet (1.85 m) away from any people or objects. Stretch SIR deployment harness and pigtail adapter from air bag module to its full length. Place a 12-volt battery near shorted end of SIR deployment harness.
- Connect air bag module to pigtail adapter on SIR deployment harness. See Fig 1 . Ensure area around air bag module is clear of people and objects. Verify that air bag module is resting with trim cover facing up.
- Separate the two banana plugs on SIR deployment harness. Connect SIR deployment harness wires to battery. See Fig 1 . Air bag module will deploy immediately. If air bag module does not deploy, go to next step. Disconnect SIR deployment harness from battery. Short the two SIR deployment harness leads. DO NOT touch air bag module area for at least 10 minutes due to heat generated during deployment. Wear gloves and safety glasses before handling deployed air bag module. Wash hands with mild soap and water afterward. Dispose of deployed air bag modules as you would any other part. Repeat deployment procedure for passenger-side air bag module.
- Ensure that SIR deployment harness is disconnected from battery and that the two banana plugs have been shorted together. Disconnect pigtail adapter from air bag module. Temporarily store air bag module with trim cover facing up. Contact manufacturer for further instructions.
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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.