Power Seat System

The power seat system allows the driver and front seat passenger to electrically adjust their seating positions using the power seat switches located on the outboard seat cushion side shield of each front seat.

A driver side eight-way power seat is standard on highline models and optional on others. The power seat includes a six-way adjustable seat cushion track and a two-way power seat back. The eight-way power seat is also available with the heated seat and memory seat system that automatically positions the power seat for two different drivers and MEMORY SEAT SYSTEM below.




The power seat system for this vehicle includes the following major components:
- Power Seat Adjuster - Depending on the seat, four-way or eight-way power, the adjuster (6) may be equipped with up to four electric motors.
There are three reversible motors that operate the power seat adjuster. The motors are connected to worm-drive gearboxes that move the seat adjuster through a combination of screw-type drive units.
The front and rear of a seat are operated by different motors. They can be raised or lowered independently of each other. When the center seat switch is pushed in the Up or Down direction, both the front and rear motors operate in unison. The forward/rearward motor is operated by pushing the center seat switch in the Forward or Rearward direction, which moves the entire seat in the selected direction on all models.
Each motor contains a self-resetting circuit breaker to protect it from overload. Consecutive or frequent resetting of the circuit breakers must not be allowed to continue, or the motors may be damaged.
The power seat adjuster cannot be repaired, and is serviced only as a complete unit .
- Power Seat Recliner - The power seat recliner (3) replaces the manual seat recliner. The power seat option includes an electrically operated power seat back recliner mechanism. The power seat recliner switch is integral to the power seat switch assembly but is actuated with a separate switch knob. The power seat recliner motor assembly is mounted in the place of a seat hinge on the outboard side of the seat. The upper hinge plate of the power seat recliner mechanism is secured with two screws to the seat back frame and is concealed beneath the seat back trim cover and padding. The lower hinge plate and the motor and drive unit of the power seat recliner mechanism is secured with two screws to the seat cushion frame, and is concealed by the outboard seat cushion side shield.
The power seat recliner motor cannot be repaired. If the unit is faulty or damaged, it must be replaced.
- Power Seat Switches - Two power seat switches are used per vehicle if equipped with power seats. One seat switch is used for each front seat. Each switch is mounted in the appropriate seat cushion side shield.

The power seat system receives battery current through a 40 amp fuse in the Power Distribution Center (PDC) and a 20 amp circuit breaker in the junction block so that the power seats remain operational, regardless of the ignition switch position.

When a power seat switch is actuated, a battery feed and a ground path are applied through the power seat switch contacts to the appropriate motor or motors. The motor and drive unit operate to move the seat in the selected direction until the switch is released, or until the travel limit of the power seat track is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor is reversed through the switch contacts. This causes the motor to run in the opposite direction.

When the recliner switch control knob is actuated, a resistance signal is sent to the appropriate Door Module via hard wired connections. The door module then sends the request to the Memory Seat Module (MSM) via the Controller Area Network (CAN) bus circuit. The MHSAPM is responsible for the 12v battery feed and ground path to the power seat recliner adjuster motor. The adjuster motor operates to move the recliner mechanism through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached.

The driver side power seat recliner motor used on models equipped with the memory system also has a position potentiometer integral to the motor assembly, which electronically monitors the motor position.