Driver Seat Module (DSM) Hard Stop/Soft Stop

A hard stop occurs when one of the memory seat track, backrest (recline) 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 stop is set by the DSM. 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. To prevent unnecessary stress on the seat, steering column and motors, the DSM will set up to 10 soft stop positions, 2 for each moving axis. 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 milliseconds and establish the soft stop for that axis in that direction. The DSM uses this "back up" strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction.