Seat Belt Tensioner, Checking

NOTE: The graphics in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the graphics is always correct.

CAUTION: When replacing deployed seat belt tensioners, seat belt buckles and end mountings must always be replaced.

Seat belt tensioners can be checked in two different ways:

Check for any stored diagnostic trouble code (DTC) using VIDA
Physical check as follows.

Fig 1: Identifying Piston Positions

Courtesy of VOLVO CARS OF NORTH AMERICA.

Insert a wire in the pipe on the seat belt tensioner as shown.

Check the piston position in the seat belt tensioner.

Piston position A:

The seat belt tensioner has deployed. Replace the seat belt tensioner, seat belt buckle and end mounting.

Piston position B:

The seat belt tensioner has not deployed. No corrective action is required.