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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DESCRIPTION & OPERATIONSIDE IMPACT SENSOR (SIS)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Side Impact Sensor (Sis)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Side Impact Sensor (Sis)
WARNING: This page is about a different car, the 2000 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
Side Impact Sensors (SIS) are located in driver and passenger side B-pillars. Each SIS monitors vehicle acceleration and velocity changes to detect side impact crashes. During a frontal crash, each SIS acts as a discriminating sensor.
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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.