Description
DESCRIPTION
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 includes a six-way adjustable seat cushion track and a two-way power seat back. The driver power seat can be adjusted up, down, front up, front down, forward, rearward, recliner forward, and recliner rearward. A passenger side four-way power seat includes a two-way adjustable seat cushion track and a two-way power seat back. The passenger power front seat can be adjusted forward, rearward, recliner forward and recliner rearward. The power seat system is also available with the heated seat option and memory seat option 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 - The power seat adjuster is made up of the upper and lower power seat adjuster assemblies. The driver upper power seat adjuster contains two reversible motors that are connected to worm-drive gearboxes that move the seat adjuster through a combination of screw-type drive units. These motors are the height adjust motor and the front tilt motor. On vehicles equipped with non-memory power seats, each motor contains a self-resetting circuit breaker to protect it from overload. On vehicles equipped with memory power seats the motor overload protection is a function of the Memory Seat Module (MSM). Consecutive or frequent resetting of the circuit breakers may damaged the motors. There are no motors on the passenger upper power seat adjuster.
The height adjust motor is located on the rear of the upper power seat adjuster assembly and controls the up and down movement of the entire seat. The height adjust motor can be serviced separately from the power seat adjuster assembly.
The front tilt motor is located on the front of the upper power seat adjuster assembly and controls the up and down movement of the seat front only. The front tilt motor can be serviced separately from the power seat adjuster assembly.
The driver and passenger lower power seat adjusters contain one reversible motor that is connected to a worm-drive gearbox that moves the seat adjuster through a screw-type drive unit. On vehicles equipped with non-memory power seats, the motor will contain a self-resetting circuit breaker to protect it from overload. On vehicles equipped with memory power seats the motor overload protection is a function of the Memory Seat Module (MSM). Consecutive or frequent resetting of the circuit breakers may damaged the motors. The motor is part of the lower power seat track unit and must be replaced as an assembly.
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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 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 inoperative or damaged, the seat back frame must be replaced
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Power Seat Switches - Vehicles may be equipped with driver only, or driver and passenger power seat switches. One seat switch is used for each front seat. 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, and the drivers side view mirror positions. 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 twenty radio station presets (ten AM and ten FM), also for two drivers. The memory system also will store and recall the last station listened to for each driver, even if it is not one of the twenty 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 overhead console.
The memory system also has a easy exit feature that will move the driver seat 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 a customer programmable feature of the overhead console.
The memory system includes the following components:
- Memory Selector Switch - located in the driver door trim panel.
- Driver Memory Mirror Module (DMMM) - located in the driver door, behind the trim panel.
- Passenger Memory Mirror Module (PMMM) - located in the passenger door, behind the trim panel.
- Hall Effect Sensors - Drivers Mirror - The hall effect sensor is permanently installed on the drivers side view 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.
- 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.
- Automatic Temperature Control (ATC) - 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 information are needed.