Power Seats - Description
DESCRIPTION
POWER SEAT SYSTEM
NOTE: Driver seat shown, passenger seat similar.
The power seat system allows the driver and front seat passenger to electrically adjust the seating position using the power seat switch assembly (2) located on the outboard seat cushion side shield (3).
A driver side six-way power seat is available on this vehicle. The power seat includes a six-way adjustable seat cushion track. The six-way power seat can be adjusted back up, back down, front up, front down, forward and rearward. A two-way front passenger seat is also available as an option. The front passenger seat can be adjusted forward and rearward only. 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 can be made up of the upper and lower power seat adjuster assemblies. The upper power seat adjuster (1) is used for the driver power seat only. It contains two reversible motors that are connected to worm-drive gearboxes that move the seat adjusters through screw-type drive units. These motors control the front seat tilt, rear seat tilt and when activated together the height of the driver seat. The lower power seat adjuster (2) is used on both the driver and front passenger power seats. It contains one reversible motor that is connected 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 driver seat. 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 system for this vehicle 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 part of the power seat track unit (1) and must be replaced as an assembly, Power Seat Track - Removal.
The Rear Tilt Motor (3) is located on the upper power seat adjuster assembly and controls the up and down movement of the seat rear only. The front tilt motor is part of the power seat track unit (1) and must be replaced as an assembly, Power Seat Track - Removal.
The Lower Power Seat Adjuster contains one reversible motor (4) that is connected 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 driver seat. The motor is part of the power seat track unit (1) and must be replaced as an assembly, Power Seat Track - Removal.
Power Seat Switch - Vehicles may be equipped with a driver side six-way power seat switch. The power seat switch has a paddle-type lever mounted on the outboard seat side shield. Movement of the seat cushion mimics the action of the switch paddle.
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 and driver outside mirror 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 60 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 includes the following components:
- Memory Selector Switch - located on the lower left side of the instrument panel, below the air vent.
- Driver Door Module (DDM) - located in the driver 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 seat 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.
- 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.