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 104 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DESCRIPTION & OPERATIONSIDE IMPACT SENSOR (SIS)
1999 GMC Forward Control 5.7 R, Automatic
Side Impact Sensor (Sis)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Side Impact Sensor (Sis)
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
SIS monitors vehicle acceleration and velocity changes to detect side impact collisions that are severe enough to warrant deployment of side air bag. SIS is not part of deployment loop, but provides input to SDM.
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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.