The memory seat system consists of the memory seat module (MSM) and five seat motors. Each motor has a position sensor attached to it. The MSM controls the movement of the five seat position motors. All 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 three motors that move the position of the seat. These are the forward/back motor, rear height motor, and front height motor. Both height motors run simultaneously when the LH seat switch is operated to move the entire seat up and down. The recline motor moves the angle of the seatback. The headrest motor moves the height of the headrest.

All motors are reversible. For example, the seat is moved forward and back by one motor. When the MSM receives an input to move the seat forward, it supplies battery positive voltage (B+) and ground to run the motor to move the seat forward. When it receives a seat back input, the MSM will supply power to the same motor, but the voltage and ground will be on the opposite motor cavities. The voltage polarity is reversed and the motor will run the opposite direction, moving the seat back. 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 attached to each motor's transmission cable. When the cable rotates, the resistance of the potentiometer varies and the feedback voltage is monitored by the MSM to determine the motor'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 motor positions by storing the feedback voltage of their respective position sensors. 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 motor run. The lumbar support is not involved in the easy exit function.

The memory seat module (MSM) receives the seat manual movement inputs from the LH seat switch. When a forward/back, rear height, front height, recline, or headrest input is received, the MSM supplies battery positive voltage (B+) to the appropriate motor(s) and the seat or seatback moves accordingly.

The LH front power window switch receives the inputs from the memory function switch. The LH front power window switch then sends a message via the simple bus interface to the LH front door module (LFDM) indicating that memory function input has been received. The LFDM then sends a message to the memory seat module (MSM) via class 2 serial data line. The current position may be recorded for two different drivers. To record the current position, the SET button is pressed followed by the 1 or 2 button, which is followed by a chime to acknowledge the input. When the MSM receives a memory set message, it records the feedback voltages from the position sensors for the appropriate driver. To record an easy exit position, the SET button is pressed followed by the EXIT button and the 1 or 2 button, which is followed by a chime to acknowledge the input. 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 to acknowledge the input 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 to acknowledge the input 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 east exit.

When a keyless entry transmitter is used 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 three personalized recall options when the MSM receives an unlock message:

The memory seat module (MSM) receives the ignition switch input 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.