The memory seat system consists of the memory seat module (MSM), 4 seat motors and 2 lumbar motors. Each motor has a position sensor attached to the motor. The MSM controls the movement of the 4 seat position motors and the 2 lumbar motors. All of the motors operate independently of each other. Each motor contains an electronic circuit breaker (PTC), which will reset only after voltage has been removed from the motor.

There are 3 motors that move the position of the seat. These are the horizontal motor, rear vertical motor, and front vertical motor. The horizontal motor moves the entire seat forward and backward. Both vertical motors run simultaneously when the seat switch is operated in order to move the entire seat up and down. The recline motor moves the angle of the seatback.

All motors are reversible. For example, the seat is moved forward and backward by one motor. When the MSM receives a signal to move the seat forward, the MSM supplies battery positive voltage (B+) and ground to run the motor in order to move the seat forward. When the MSM receives a seat backward signal, the MSM still supplies voltage to the same motor, but the voltage and ground will be on the opposite control circuits to the motor. The voltage polarity is reversed and the motor will run the opposite direction, moving the seat backward. All other seat motors are also powered this way.

The MSM provides each seat motor with a soft stop. The module will actually stop the motor just before the physical end-of-travel for that motor. This decreases the stress on each motor. If a motor reaches the end-of-travel due a soft stop and the seat switch is released and then activated again, the seat will move a short distance farther, to the physical travel limit.

There are also position sensors that are potentiometers which are attached to each motor's transmission cable, or in the lumbar case they are attached directly to the motors. When the cable or motor rotates, the resistance of the potentiometer varies and the feedback voltage is monitored by the MSM to determine the seat's position. The sensor feedback voltage varies from 0.5 volts to 4.5 volts. When a memory set command is received, the MSM records the seat position by storing the feedback voltage from each position sensor. When a memory recall command is received, the MSM moves the motors until all the position sensor feedback voltages equals the feedback voltages stored in memory. For easy exit functions, only seat position sensor feedback voltages are recorded and only the seat motors are controlled. The lumbar support is not involved in the easy exit function.

The memory seat module (MSM) receives the seat and lumbar manual movement signals from the seat switch. When a horizontal, rear vertical, front vertical, recline, or lumbar signal is received, the MSM supplies battery positive voltage (B+) to the appropriate motor(s) and the seat, seatback, or lumbar moves accordingly.

The driver's door switch assembly (DDSA) receives the signals from the memory function switch. The (DDSA) then sends a message via the simple bus interface to the driver door module (DDM) indicating that a memory function signal has been received. The DDM then sends a message to the memory seat module (MSM) via class 2 serial data line. The current position may be recorded for 2 different drivers. To record a position, adjust the drivers seat (including the lumbar adjustments) and both outside mirrors to a comfortable position, then press and hold button 1 for 5 seconds, a double beep will sound each time a memory position is set. A second mirror and seating position may be programmed by repeating the above steps and pressing button 2. When the MSM receives a memory set message, the MSM records the feedback voltages from the position sensors for the appropriate driver. The exit position is programmed by moving to the desired exit position and then holding the exit button for 5 seconds. Two exit positions can be programmed, one for each driver. When the MSM receives a set easy exit message, the MSM records the feedback voltages from the three seat position sensors and the recline position sensor for the appropriate driver.

When the 1 or 2 button is pressed, a single chime is sounded through the radio in order to acknowledge the signal and the MSM receives the memory recall message. The MSM then applies battery positive voltage (B+) to the motors until the position sensor feedback voltages equal the feedback voltages stored in memory for the appropriate driver. When the EXIT button is pressed, a single chime is sounded in order to acknowledge the signal and the MSM receives the easy exit message. The MSM then applies battery positive voltage (B+) to the seat motors until the position sensor feedback voltages equal the feedback voltages stored in memory for the appropriate driver seat exit.

Memory recall will not work if the shift lever is out of NEUTRAL (N) or PARK (P).

When a keyless entry transmitter is used in order to unlock the vehicle's doors, the remote keyless entry (RKE) module communicates the unlock command and which driver performed the command to the MSM via a class 2 message. There are 3 personalized recall options when the MSM receives an unlock message:

The memory seat module (MSM) receives the ignition switch signal and the gear selector position via class 2 messages. When the ignition switch is in the OFF position, memory record, memory recall, personalization recall, and exit recall functions are all allowed. When the ignition switch is in the ON position and the gear selector is in the PARK position, only the recall personalization function is deactivated and all other memory functions are allowed. When the ignition switch is in the ON position and the gear selector is out of the PARK position, memory record is allowed, but all other memory seat functions are not allowed.