Theory Of Operation

The Driver Memory Seat System is made up of:

• Memory Seat Module-Driver (MSMD)
• Driver Seat Switch
• Memory Seat Switch
• Horizontal Seat Motors
• Vertical Seat Motors
• Recliner Seat Motor (if equipped)

The Driver Seat Switch is a Multiplex (Mux) switch which uses a set resistance level for each switch position. These resistances correspond to different voltages which are monitored by the MSMD over two separate circuits. When a voltage change is detected, the MSMD will command the appropriate Seat motor(s) to move the seat in the requested direction as long as the Driver Seat Switch is held in that direction or its stops have been reached.

The Memory Switch is a Mux switch that is used to set and recall the seat positions. When a Memory Switch button is pressed, the Driver Door Module (DDM) detects a voltage change and sends a request over the Controller Area Network (CAN) bus circuit to the MSMD to perform the requested command. If the SET button on the Memory Switch is pressed, followed by the 1 or 2 button, the MSMD will store the seat position based on the position inputs received from the hall-effect position sensors. If the 1 or 2 button on the Memory Switch is pressed, the MSMD will recall the stored seat position for that particular selection and return the seat to the stored position. Memory position may also be recalled using a linked FOBIK transmitter. For driver safety, the MSMD will prevent the memory recall function from being initiated if the transmission gear selector lever is not in the Park position or if the vehicle is moving.

The seat motors each contain a hall-effect position sensor. The hall-effect position sensor provides feedback to the MSMD in relation to the motor's position. The various motor stop positions are stored in the MSMD during initial module programming.