Operational and Functional Checks

• Replace each seat belt system worn during a crash unless the crash was minor.
• Perform the seat belt check for each seat belt system. Replace the seat belt system if there is any doubt about the condition of system components.

Perform the following inspection from the driver seat:

1. Turn the ignition switch to the ON position. Verify proper operation of the seat belt reminder lamp with the belt buckled and with the belt unbuckled. Refer to Seat Belt System Description and Operation .
2. Inspect the front seat back seat belt bezel in order to ensure that the following conditions are met:
   • The seat belt webbing is seated flatly in the guide slot
   • The seat belt webbing does not bind
3. Verify that the seat belt buckle faces inboard and is accessible.
4. Verify that the seat belt retractor units are securely attached and show no apparent deformation.
5. Verify that the seat belt anchor bolts/nuts are secure.
6. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.
7. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor.
8. Snap the seat belt latch plate into the buckle.
9. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
   1. 9.1.  Push the button on the buckle.
   2. 9.2.  Verify that the seat belt latch plate releases easily from the buckle.
   3. 9.3.  Verify that the button returns to its original position.

Repeat the inspection procedure (steps 2 through 9) from the front passenger seat.

Perform the inspection procedure on the rear seats.

1. Inspect the rear seat back seat belt bezel in order to ensure that the following conditions are met:
   • The seat belt webbing is seated flatly in the guide slot
   • The seat belt webbing does not bind
2. Verify that the seat belt buckle faces inboard and is accessible.
3. Verify that the seat belt retractor units are securely attached and show no apparent deformation.
4. Verify that the seat belt anchor bolts/nuts are secure.
5. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.
6. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor.
7. Snap the seat belt latch plate into the buckle.
8. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
   1. 8.1.  Push the button on the buckle.
   2. 8.2.  Verify that the seat belt latch plate releases easily from the buckle.
   3. 8.3.  Verify that the button returns to its original position.

Perform the following steps in order to inspect the rear center seat belts:

1. Verify that the center seat belts are accessible.
2. Verify that the center seat belts have no twists or tears in the webbing.
3. Snap the center seat belt latch plate into the buckle.
4. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
   1. 4.1.  Push the button on the buckle.
   2. 4.2.  Verify that the seat belt latch plate releases easily from the buckle.
   3. 4.3.  Verify that the button returns to its original position.

1. Fasten the seat belts. An assistant is needed when the retractor under test is not part of the driver seat belt.
2. Accelerate the vehicle slowly to 16 km/h (10 mph) and apply the brakes firmly.
3. Verify that the seat belt locks when braking firmly.
4. If the belt does not lock, proceed with the following steps.
   1. 4.1.  Remove the seat belt retractor assembly.
   2. 4.2.  Tilt the seat belt retractor slowly.
   3. 4.3.  Ensure that the seat belt webbing can be pulled from the retractor at an inclination of 15 degrees or less and cannot be pulled from the retractor at an inclination of 45 degrees or more.
   4. 4.4.  If the seat belt retractor does not operate as described, replace the seat belt assembly.
   Fig 1: Identifying Seat Belt Webbing Inclination
   Courtesy of GENERAL MOTORS CORP.
   • Refer to Seat Belt Replacement - Front .
   • Refer to Seat Belt Replacement - Rear (TrailBlazer, Envoy, Bravada)  or Seat Belt Replacement - Rear (TrailBlazer EXT, Envoy XL) .
   • Refer to Seat Belt Retractor Replacement - No. 1 Center Rear (TrailBlazer EXT, Envoy XL)  or Seat Belt Retractor Replacement - No. 1 Center Rear (TrailBlazer, Envoy and Bravada) .