Driver Seat Module (DSM) Hard Stop/Soft Stop

Seats

Special Tools:

Principles of Operation

Driver Seat Module (DSM) Hard Stop/Soft Stop

A hard stop occurs when one of the memory seat track, seat backrest recliner or power steering column axes physically reach the end of travel and can go no further. A soft stop occurs when the seat or steering column stops before physically reaching the end of travel. The hard stop is set by seat or steering column design and cannot be changed or adjusted. The soft stops are set by the DSM to prevent unnecessary stress on the seat, steering column and motors. The seat track axes are forward/rearward, front up/down and rear up/down. The seat backrest axis is forward/rearward and the steering column axis is up/down. The DSM will use a preset distance from the hard stop to determine where the soft stop will occur. When an axis reaches the hard stop and the switch is held for approximately one second, it will then back up 180 millisecond and establish the soft stop for that end of travel. The DSM uses this "back up" strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction. After a new seat track, seat recliner motor, power steering column or DSM is installed, allow the DSM to reset the soft stops by operating the component(s) in all directions through the full range of travel. This will prevent premature stopping points when the component(s) are initially operated after service is complete.