SIR Service Precautions

Warning

If a service procedure indicates that a module is to be replaced, a new production unit MUST be ordered from the GM Parts Catalog or certified supplier. Using a module that has been reset by a 3rd party company is strictly prohibited. Not using a new production unit may result in improper performance of the safety system in the event of an accident, which may result in bodily injury.

Warning

When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling . Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.

Warning

Do not strike or jolt the inflatable restraint sensing and diagnostic module (SDM). Before applying power to the SDM, make sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to observe the correct installation procedure could cause SIR deployment, personal injury, or unnecessary SIR system repairs. General Service Instructions

Note

The Restraints Control Module (RCM) maintains a reserved energy supply. The reserved energy supply provides deployment power for the SIR air bags. Deployment power may be available for up to 2 minutes after disconnecting the vehicle power. Disabling the SIR system prevents deployment of the SIR air bags from the reserved energy supply.

Note

The following are general service instructions which must be followed in order to properly repair the vehicle and return it to its original integrity: Do not expose air bags to temperatures above 85 °C (185 °F) Verify the correct replacement part number. Do not substitute a component from a different vehicle. Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system

Note

Discard any of the following components if it has been dropped from a height of 80 cm (31.5 in) or greater: Restraints Control Module Restraint Occupant Classification System Airbag Driver steering wheel airbag coil Seat belt pretensioner Impact sensor

Last updated: Aug 8, 2026

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Safety notice.Service procedures involve real hazards — hot surfaces, high‑pressure fluids, stored energy in springs and airbags, and high‑voltage systems.Always follow the WARNING and CAUTION notices in the original text.Improper repair can cause serious injury, death, or vehicle damage. This site mirrors factory documentation for reference; you are responsible for the safe execution of any procedure. Use appropriate PPE, torque to spec, and never bypass safety systems.

Content extracted from the official GM factory service manual (document ID 15530883). All rights to the original text and diagrams belong to General Motors. This site is an unofficial technical reference — not affiliated with, endorsed by, or supported by GM.