GM Service Manual Online
For 1990-2009 cars only

Fasten Safety Belt Indicator

When the ignition is turned ON, the body control module (BCM) reports the status of the driver seat belt switch by flashing the fasten safety belt indicator. The BCM will flash the fasten safety belt indicator several times in association with the following conditions:

    • The driver seat belt is unbuckled.
    • The driver seat belt is buckled.
    • The driver unbuckles seat belt after ignition is turned ON.
    • The driver seat belt is unbuckled and then driver shifts into gear.

When the ignition is turned ON and the driver seat belt is unbuckled, the BCM will turn ON the fasten safety belt indicator for 20 seconds. The BCM will then flash the fasten safety belt indicator 55 times, before it turns it OFF. If the driver buckles the seat belt during this time, the BCM will turn OFF the fasten safety belt indicator.

When the ignition is turned ON and the driver seat belt is buckled, the BCM will perform a BULB TEST and then turn OFF the fasten safety belt indicator.

When the ignition is turned ON and the driver unbuckles the seat belt after the BULB TEST, the BCM turns ON the fasten safety belt indicator for 20 seconds. The BCM will then flash the fasten safety belt indicator 55 times, before it turns it OFF.

When the ignition is turned ON and the vehicle is shifted out of the PARK position, while the driver seat belt is unbuckled, the BCM will turn ON the fasten safety belt indicator for 20 seconds. The BCM will then flash the fasten safety belt indicator 55 times, before it turns it OFF. If the driver buckles the seat belt during this time, the BCM will turn OFF the fasten safety belt indicator.

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:

    • The driver and the 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 buckle belt are located between the two front seats and 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:

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