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 105 (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 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
SIS is located in driver-side and passenger-side lower B-pillars. Each SIS monitors vehicle acceleration and velocity changes to detect side impact collisions. SIS are not part of deployment loop, but provide input to SDM.
RENDER: 1.0x
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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.