GM Service Manual Online
For 1990-2009 cars only

Fasten Safety Belt Indicator

The IPC illuminates the fasten safety belt indicator when the following occurs:

    • The body control module (BCM) detects that the driver seat belt is unbuckled. The IPC receives a class 2 message from the BCM requesting illumination. The IPC illuminates the indicator for 20 seconds and then flashes the indicator for 55 seconds. The BCM also activates an audible warning.
    • The IPC detects a loss of class 2 communications with the BCM.

Restraint System

Seat belts are the primary means of occupant restraint. Seat belts help to keep the occupant(s) inside the passenger compartment and to gradually reduce the impact forces during the following events:

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

All seat belt retractors have emergency locks. The retractors remain unlocked during normal operation and under normal driving conditions. The retractors remain unlocked during normal conditions in order to allow free movement of the upper body of each occupant. A pendulum locks the seat belt webbing into position. The pendulum causes a locking bar to engage a cog on the spool of the retractor mechanism when the following conditions occur:

    • A rapid extraction of the seat belt webbing from the retractor
    • An abrupt change in vehicle speed
    • An abrupt change in vehicle direction
    • Operation of the vehicle on a steep upgrade
    • Operation of the vehicle on a downgrade

The seat belts have an automatic locking (cinch) feature. The cinch feature is activated when the seat belt webbing is completely extended from the retractor. The cinch feature prevents the webbing from extending beyond the position from which it is allowed to retract. Use of the cinch feature is recommended for securing a child seat. The cinch feature may be cancelled by allowing the webbing to wind back completely into the retractor. After the cinch feature is cancelled, the webbing is unlocked. After the cinch feature is cancelled, the webbing will extend from the retractor. This vehicle is also equipped with a supplemental inflatable restraint (SIR) system. Refer to SIR System Description and Operation in SIR.

Front Seat Belt System

The front seat belts on sedans are equipped with an adjustable shoulder belt guide loop. The shoulder belt can be adjusted to one of the four positions by a release switch located at the center pillar. The release switch permits adjustment of the shoulder belt to the height of the occupant. The front passenger seat and the rear seat retractors are dual-mode type retractors with emergency locking and automatic features. The automatic locking feature is for use with a child seat. The front seat belt system includes the following components:

    • Driver and the passenger seat belt retractors-- The driver and passenger seat belt retractors are located and attached on the center pillar post in all coupes and sedans
    • The front seat center driver and passenger's buckle belts are located between the two front seats. These buckle belts are attached to the seat.
    •  The driver seat belt system, includes a seat belt switch in the driver seat belt buckle which controls the fasten safety belt indicator and a tone alarm.

Rear Seat Belt System

The rear seat belt system includes the following components:

    • Rear seat belt retractors-- The rear seat belt retractors are located under the rear deck trim panel. The rear seat belt retractors are attached to the rear deck body panel.
    • Rear seat center and outer seat buckle belts-- The rear seat center and outer seat buckle belts are located in the center of the lower seat cushion. The rear seat center and outer seat buckle belts are attached to the rear floor pan.