Power Seats System

POWER SEAT SYSTEM COMPONENTS
The power seat system for the driver and passenger consists of the following components:
^ Power Seat Switch
^ Seat Horizontal Motor
^ Seat Front Vertical Motor
^ Seat Rear Vertical Motor
^ Seat Recliner Motor (Full Feature Seat Only)
^ Memory Seat Module (Drivers Full Feature Seat Only)

POWER SEAT SYSTEM OPERATION
There are two options of power seats available with this system. One option is the base power seat and it is limited to positioning the seat vertically and horizontal only. The other option is a full feature seat that can position the seat vertically, horizontally and recline the back cushion. The Power Seat System can contain up to four motors for positioning. They are the Horizontal, Rear Vertical, Front Vertical and Recliner motor. The Horizontal motor is used to position the seat horizontally while the Front Vertical and Rear Vertical motor can raise the whole seat up or down. The Front Vertical and Rear Vertical motors can be operated independently of each other so that the seat cushion can be tilted forward and rearward. The Recline motor (only found in the Full Feature Seat) positions the back of the seat forward or backward. Battery positive voltage is supplied to the Power Seats through the seat circuit breaker then to the Memory Seat Module and the Power Seat Switch (Full Feature Seat) or just to the Power Seat Switch (Base Seat). A ground circuit is supplied to the Power Seats at each individual seat and the motors can have ground applied to either control circuit by either the Power Seat Switch (base seat) or the Memory Seat Module (Full Feature Seat).

SEAT CONTROL MOTORS
The seat is positioned by reversible DC motors. Each motor runs clockwise, or anti-clockwise, depending on the polarity of the applied DC voltage. Input to move the Power Seat is received from the Power Seat Switch. When the battery positive voltage and the ground is reversed on the control circuits the motor will move the seat in the opposite direction. Each motor has a internal circuit breaker that will open either when the seat reaches its limit of travel or if the seat is obstructed from moving, and will reset when the motor is no longer being energize.

MEMORY SEAT MODULE (DSM)
Battery positive voltage is supplied through the seat circuit breaker to the DSM. In response to a valid manual or memory switch command, the DSM will apply power and ground to the selected motors within 150 ms. To limit peak power, DSM restricts the number of motors that can be turned on simultaneously to three motors. If the module detects all four switches at the same time, DSM turns on three seat adjusters: horizontal, front, and rear. If the user continues to hold all four switches, the DSM actuates the fourth motor only after one of the first three motors has reached its end motion. For a memory recall operation, the DSM first moves the horizontal, front, and rear motors first. If all four switches are still activated, DSM actuate the recline motor only when one of the seat adjusters has reached its end motion. In order to conserve battery power, the DSM enters automatic standby mode whenever the unit has been inactive for 16 seconds. In the standby mode, the DSM stores memory settings so that when it is awake again it knows where the seat is set.

POSITION SENSORS
The DSM in the full feature seat incorporates a method for sensing the position of the three adjusters of the seat system: horizontal, front vertical, rear vertical and recline potentiometers. The DSM provides five volts and return ground to all the motor position sensors.

PLATFORM INTERFACE SIGNALS
IGNITION and PARK signal affect memory recall motions. The memory seat normally works if the car is in PARK. The memory recalling function must be inoperative if the car is in Neutral or Driving mode.

POWER SEAT SWITCH ADJUSTER
The power seat switches are powered by the switch feed circuit provided by the DSM. Normally the contact in the switches are connected to a good ground. The seat switches are divided into two major groups: Six-Way, and Two-Way seat adjuster. Six-Way seat switch adjuster adjusts the seat in Horizontal forward and rearward, Front up and down, and Rear up and down. The Two-Way seat switch adjuster adjusts the seat to recline in forward and rearward direction. The switches are mechanized such that the user cannot simultaneously actuate a given seat adjuster in two opposite directions.

MEMORY SEAT SWITCH
The memory seat switch assembly consists of three push-button switches: MEMORY 1, MEMORY 2, and EXIT. The memory switch feed terminals are connected to a battery positive voltage through the DSM. When one of the memory recall button switch is activated, the seat moves to the direction where it is set to. If any of the three memory seat is, actuated before the seat reaches its intended position, the seat will stop. In order to set the seat to a certain desired position, first the seat will be moved manually to the position desired, press either MEMORY button until an audible chime is heard. For information on how to set and personalize the memory seat refer to Driver Personalization in Personalization.