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 type crashes.
    • Rear impact type crashes.
    • Side impact type crashes.
    • Roll-over type crashes.

The lap seat belt retractors have an automatic locking (cinch) feature. The cinch feature is activated when the lap webbing is fully extended and allowed to partially rewind. With the cinch feature activated the seat belt webbing will not extend. The cinch feature is canceled by allowing the webbing to be completely wound back into the retractor. After the cinch feature is canceled, the webbing is unlocked and will extend from the retractor.

The upper seat belt retractors have an emergency locking feature which remains unlocked during normal driving conditions. This allows free movement of the occupant's upper body. When the emergency locks are activated, the seat belt webbing is locked into position. A pendulum causes a locking bar to engage a cog on the spool of the retractor mechanism locking the seat belt webbing under the following conditions:

    • The rapid extraction of the seat belt webbing from the retractor.
    • The speed of the vehicle changes abruptly.
    • The direction of the vehicle changes abruptly.
    • The vehicle is on a steep upgrade or a downgrade.

In conjunction with the seat belts, this vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Refer to SIR System Operation in Restraints.