Navigator 4WD V8-5.4L VIN 5 (2006)
Seat Belt Tensioner: Description and Operation
Safety Belt System
Pretensioner System
All vehicles have a pretensioner system used with the front outboard safety belt buckles. This works in conjunction with the front air bag system
mounted in the steering wheel and instrument panel.
If the vehicle is involved in a collision that results in deployment of the front air bags and safety belt pretensioners, the driver and passenger seat belt
system (including safety belt buckle and pretensioners, safety belt retractors and height adjusters) must be replaced.
For diagnostic information, refer to Air Bag Systems.
For pretensioner buckle disposal information, refer to Air Bag Systems.
Safety Belt Buckle And Pretensioner
NOTE: There is currently no restraint system diagnostic tool for the safety belt buckle pretensioner under the seat connectors. If the ignition switch is
turned to the ON or START position with the safety belt buckle pretensioner electrical connector(s) disconnected, the DTC and flagged faults for an
open circuit will be activated.
The safety belt buckle and pretensioners are for the front outboard occupants, located on the inboard side of the seats. This allows the front safety belt
buckle end to move with the front seat.
The safety belt buckle and pretensioner is a pyrotechnic device that removes excess webbing from the safety belt system. When the front air bag
system is deployed, the pretensioner in the buckle deploys, causing the buckle to move downward, pulling excess webbing from the lap and shoulder
safety belts.