RAM 3500 Chassis Cab Truck 2WD L6-6.7L DSL Turbo (2010)
Seat Belt Tensioner: Description and Operation
Seat Belt Tension Reducer - Operation
OPERATION
The seat belt tension reducer is controlled by a ground signal received from the seat belt switch on the seat belt switch sense circuit and a battery current
signal received from the ignition switch on the fused ignition switch output (run-accessory) circuit. When the seat belt switch is closed (the driver side
front seat belt is fastened) and the ignition switch is in the ON or ACCESSORY positions, the seat belt tension reducer solenoid is energized.
When the solenoid is energized, it actuates a mechanism within the driver side front outboard seat belt retractor to reduce the normal recoil spring
tension exerted by the retractor spool, which is designed to reel in the seat belt webbing onto the spool. When the driver side seat belt is unbuckled or if
the ignition switch is turned to any position except ON or ACCESSORY, the tension reducer solenoid is de-energized and the normal recoil spring
tension of the retractor is restored.
The action of the seat belt tension reducer results in improved seat belt comfort for the driver. Reducing the seat belt retractor recoil spring tension is
desirable on standard cab versions of this vehicle and not on the quad cab or mega cab versions due to the different mounting position required for the
seat belt turning loop on the B-pillar relative to the driver seat position on the standard cab.
The seat belt tension reducer as well as the hard wired inputs and outputs of the tension reducer may be diagnosed using conventional diagnostic tools
and procedures. Refer to the appropriate wiring information.
