Driver Power Seat Operation: Notes

The driver seat control switch communicates over a LIN to the DSM. When the DSM receives the input from the seat control switch, the DSM provides power to the appropriate seat motor until the input is removed. All of the seat motor circuits are normally grounded through the DSM. The DSM internally switches the appropriate circuit from ground to voltage to operate the motors. The DSM

As the seat is adjusted, the DSM monitors fluctuations of the motor current (ripple count for DC (direct current) motors) to determine the current seat position. The DSM removes voltage from the motor upon termination of the seat control switch input or if the DSM does not detect movement from the motor. If equipped with a power head restraint, the DSM does not directly control (or monitor) the head restraint position. For additional information, refer to Driver Front Head Restraint Operation .