GM Service Manual Online
For 1990-2009 cars only

Service Precautions

CAUTION: This vehicle has a Supplemental Inflatable Restraint (SIR) System. Refer to SIR Component Location View in order to determine whether you are performing service on or near the SIR components or the SIR wiring. When you are performing service on or near the SIR components or the SIR wiring, refer to SIR On-Vehicle Service information. Failure to follow the CAUTIONS could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

The inflatable restraint Diagnostic Energy Reserve Module (DERM) maintains a reserve energy supply. When the vehicle power is insufficient to cause deployment of the air bag, the reserve energy supply provides the deployment power. Deployment power is available for as much as 2 minutes after disconnecting the vehicle power by any of the following methods:

    • Turn OFF the ignition switch
    • Remove the fuse that powers the DERM
    • Disconnect the vehicle battery from the vehicle electrical system

Performing the following procedures prevents deploying of the air bag from the reserve energy supply power.

Disconnecting the DERM inflator module from the deployment loop allows you to begin service immediately without waiting for the 2 minute time period to expire. Refer to Disabling the SIR System .