Front
DESCRIPTION
POWER SEAT SYSTEM
NOTE: Driver seat shown passenger seat similar.
A driver and passenger eight-way power seat is available on this vehicle. The power seat system allows the seat occupant to electrically adjust the seating position using the power seat switch assembly (1 and 2) located on the outboard seat cushion side shield (3).
The eight-way power seat includes a six-way adjustable seat cushion track (1) and a two-way power seat back. The power seat can be adjusted up, down, front up, front down, forward, rearward, recliner forward, and recliner rearward. The power seat system is also available with the heated seat option, Heated Seats - Description for additional information on the heated seats.
The power seat adjuster (1) contains two reversible motors that are connected to worm-drive gearboxes that move the seat adjusters through screw-type drive units. These motors are the height adjust motor (3) and the front tilt motor (2). The third motor on the power seat adjuster is responsible for the fore and aft movement of the power seat. The fore/aft motor (4) is a reversible motor that is connected through two flex drive cables to a worm-drive gearbox that moves the seat adjuster through a screw-type drive unit. Each motor contains a self-resetting circuit breaker to protect it from overload. Consecutive or frequent resetting of the circuit breakers may damaged the motors.
The power seat adjuster assembly (1) includes the following major components:
The Front Tilt Motor (2) is located on the upper power seat adjuster assembly and controls the up and down movement of the seat front only. The front tilt motor is available as a service part and if found to be inoperative or damaged should be replaced, Power Seat Motor - Removal.
The Height Adjust Motor (3) is located on the rear of the lower power seat adjuster assembly and controls the up and down movement of the entire seat. The height adjust motor is available as a service part and if found to be inoperative or damaged should be replaced, Power Seat Motor - Removal.
The Fore/Aft Motor (4) is a reversible motor that is connected through two flex drive cables to a worm-drive gearbox that moves the seat adjuster through a screw-type drive unit. This motor is responsible for the fore and aft movement of the power seat. The fore/aft motor is available as a service kit that includes the flex drive cables. If the motor is found to be inoperative or damaged it should be replaced, Power Seat Motor - Removal
Power Seat Recliner - The power seat recliner 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 seat frame. The upper hinge plate of the power seat recliner mechanism is welded to the seat back frame. The lower hinge plate and the motor and drive unit of the power seat recliner mechanism is secured with two screws to the power seat adjuster assembly, and is concealed by the outboard seat cushion side shield.
NOTE: The power seat recliner motor cannot be repaired. If the unit is inoperative or damaged, the seat back frame must be replaced, Seat Back Frame - Removal .
Power Seat Switch - Vehicles may be equipped with a driver side eight-way power seat switch. The power seat switches are paddle-type levers mounted on the outboard seat side shields. Movement of the seat cushions and backs mimics the action of the switch paddles.
MEMORY SEAT SYSTEM
An electronic memory seat system is available on certain models. The memory system is able to store and recall all driver side power seat positions, outside mirror positions and power adjustable pedal position. The system can be set for two different drivers. On vehicles with a factory installed radio connected to the Controller Area Network (CAN) data bus network, the memory system is also able to store and recall up to twelve radio station presets (six AM and six FM), for two drivers. The memory system will also store and recall the last station listened to for each driver, even if it is not one of the twelve preset stations.
The memory system will automatically recall all of these settings when a button of the memory switch is depressed, or when the doors are unlocked using the Remote Keyless Entry (RKE) transmitter (if enabled). If the vehicle has more than two drivers the RKE transmitter recall of memory features can be disabled. This is a customer programmable feature of the Electronic Vehicle Information Center (EVIC) set through the use of the appropriate steering wheel switches. Electronic Vehicle Information Center - Operation for additional information on the customer programmable features.
The memory system also has an "Easy Entry and /Exit" feature that provides the driver with more room to enter or exit the vehicle. When the seat is in a memorized position, it will move rearward 55 millimeters or to the end of its travel, whichever occurs first, when the key is removed from the ignition switch lock cylinder. This is also a customer programmable feature of the Electronic Vehicle Information Center (EVIC) set through the use of the appropriate steering wheel switches.
The memory system also has a "Tilt in Reverse" feature that tilts the outside mirrors down a fixed, incremental angle when the vehicle is shifted into REVERSE with the ignition switch in the RUN position. This feature provides the customer with a better view of the ground and vehicle in the area of the rear tires when backing up. The mirrors move back to their previous position when the vehicle is shifted out of REVERSE.
The memory system includes the following components:
- Memory Selector Switch - located in the driver door trim panel.
- Driver Door Module (DDM) - located in the driver door, behind the trim panel.
- Passenger Door Module (PDM) - located in the passenger door, behind the trim panel.
- Hall Effect Sensors - Outside Mirror - The hall effect sensor is permanently installed on the outside mirror motor. This hall effect sensor is used to provide a reference signal to the memory heated seat mirror module, letting the module know the exact position of the mirror.
- Sentry Key Remote Entry Module (SKREEM) - located at ignition key cylinder.
- Remote Keyless Entry (RKE) Transmitter - located with ignition key.
- Memory Seat Module (MSM) - located underneath the driver seat and also controls the Adjustable Pedals. For additional information on the PSM, Memory Seat Module - Description.
- Hall Effect Sensors - Seat Track - These hall effect sensors are permanently installed in each of the power seat track motors. They are used to provide a reference signal to the memory heated seat mirror module, letting the module know the exact position of the seat cushion and recliner.
- Radio - located in the instrument panel center stack.
Certain functions and features of the memory system rely upon resources shared with other electronic modules in the vehicle over the Controller Area Network (CAN) bus. The CAN bus allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities. For diagnosis of these electronic modules or of the CAN bus, the use of a scan tool and the proper diagnostic procedures information are needed.