Belt TENSIONERS
Never use an ohmmeter or similar tool to test airbags, door mounted inflatable curtains, adaptive seat belt tensioners, the adaptive steering column, rollover bar cassette or seat belt tensioners. Disconnect airbags, door mounted inflatable curtains, adaptive seat belt tensioners, adaptive steering column, rollover bar cassette or seat belt tensioners before testing them. Failure to do so may result in accidental deployment. This could result in serious injury or death.
There are four seat belt tensioners in the vehicle. These are located at shoulder height, one for each seat belt reel, two at the front (1 and 2) and two in the rear seat (3 and 4).
USA/CDN have seatbelt tensioners (1a and 2a) as shown above.
Other markets (not USA/CDN) have seatbelt tensioners (1b and 2b) as shown above.
The seat belt tensioner tensions the seat belt to reduce the forward movement of the body.
The supplemental restraint system module (SRS) determines whether to deploy the seat belt tensioners based on whether the seat belts are being used. The seat belt tensioner will not be activated if the seat belt is not engaged. If the seat belt is fastened and the seatbelt indication does not function for the front seat belt buckles, the seat belt tensioners will be activated anyway. Rear seat belt tensioner activation is market dependent.
The belt tensioner consists of a pyrotechnical charge and a cylinder with a piston. The piston is connected to a steel cable which is secured to the seat belt retractor. When the control module deploys the belt tensioner, the piston is forced downward by the expanding gas. The piston pulls in the steel cable which retracts the belt.
For USA/CDN: the adaptive seatbelt force limiter, seat belt reel, and seat belt tensioner are installed in a single unit. In the event of a fault in any of these the whole unit must be replaced.
Never use an ohmmeter or similar tool to test airbags, door mounted inflatable curtains, adaptive seat belt tensioners, the adaptive steering column, rollover bar cassette or seat belt tensioners. Disconnect airbags, door mounted inflatable curtains, adaptive seat belt tensioners, adaptive steering column, rollover bar cassette or seat belt tensioners before testing them. Failure to do so may result in accidental deployment. This could result in serious injury or death.