Belt TENSIONERS
Never use an ohmmeter or similar tool to test airbags, inflatable curtains, adaptive seatbelt limiters, adaptive steering column or seat belt tensioners. Disconnect airbags, inflatable curtains adaptive seatbelt limiters, adaptive steering column or seat belt tensioners before testing them. Failure to do so may result in accidental deployment. This could result in serious injury or death.
The vehicle four or five belt tensioners (depending on the market). Four of these are located at shoulder height - one for each belt retractor - two in the front (1 and 2) and two in the rear seat (3 and 4).
The seat belt tensioners for the USA/CDN market (1a and 2a) are as illustrated above. The seat belt tensioners for other markets (not USA/CDN) (1b and 2b) are as illustrated above.
In some markets, there is also a belt tensioner (5) located in the belt anchorage waist-high at the driver's seat.
The belt tension contains a pyrotechnical charge that tensions the belt upon deployment.
The seat belt tensioner tensions the seat belt to reduce the forward movement of the body. This also reduces the forces on the chest from the airbag and seat belt.
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 belt force limiter, belt retractor, belt retractor sensor and belt tensioner are mounted in a unit. If there is a fault in any of these components, the entire unit must be replaced.
Never use an ohmmeter or similar tool to test airbags, inflatable curtains, adaptive seatbelt limiters, adaptive steering column or seat belt tensioners. Disconnect airbags, inflatable curtains adaptive seatbelt limiters, adaptive steering column or seat belt tensioners before testing them. Failure to do so may result in accidental deployment. This could result in serious injury or death.