GM Service Manual Online
For 1990-2009 cars only

Seat belts are the primary means of occupant restraint. Seat belts help to keep the occupant inside the passenger compartment and to ride down the crash forces more gradually during the following events:

    • Frontal impact crashes
    • Rear impact crashes
    • Side impact crashes
    • Roll-over crashes

All seat belts have emergency locks in the retractors. During normal operation, the retractors remain unlocked in order to allow free movement of the occupant's upper body under normal driving conditions. The seat belt webbing is locked into position by a pendulum. This pendulum causes a locking bar to engage a cog on the spool of the retractor mechanism under the following conditions:

    • The speed of the vehicle changes abruptly.
    • The direction of the vehicle changes abruptly.
    • The vehicle is on a steep upgrade or a downgrade.
    • The webbing is pulled quickly out of the retractor.

In conjunction with the seat belts, this vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Refer to SIR System Operation in SIR for more information about the SIR (air bag) System.