Normal Operation

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

The power seat switch is powered by battery voltage to driver seat control switch circuit 29-AH35 (OG/YE) and is supplied ground on driver circuit 91-AH35 (BN). When pressed, the power seat switch supplies the voltage and ground to the driver seat module (DSM). The DSM then supplies voltage and ground to the appropriate power seat track motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the power seat switch reverses the polarity to the DSM, which moves the seat in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (forward/reverse) and vertically (front up/down and rear up/down).

Each power seat track motor includes a position sensor, which is a potentiometer. The DSM supplies a shared reference voltage and ground to each position sensor. This enables the position sensor to send a variable voltage back to the DSM to indicate the position of the power seat track motor. The DSM uses this information to return the seat to a stored preprogrammed position when pressing the memory set switch or a remote transmitter. Refer to PRINCIPLES OF OPERATION in this article and the Owner's Literature for additional information on programming the DSM for storing memory seat and adjustable pedal positions.