Through Model Year 2010
Power Seats
Description
Power Seat System
• 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, for additional information on the heated seats. Refer to => [ Heated Seat ] Heated Seat.
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 forward and back movement of the power seat. The forward/back 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. Refer to => [ Front Tilt Motor ] Front Tilt Motor.
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. Refer to => [ Height Adjust Motor ] Height Adjust Motor.
The Forward/Back 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. Refer to => [ Forward/Back Motor ] Forward/Back Motor.
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, but is actuated with a separate switch knob.
The power seat recliner motor 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.
• The power seat recliner motor cannot be repaired. If the unit is inoperative or damaged, the seat back frame must be replaced, refer to => [ Seat Back Frame ] Seat Back Frame.
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 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 transmitter (if enabled). If the vehicle has more than two drivers the RKE transmitter recall of the memory features can be disabled. This is a customer programmable feature of the electronic vehicle information center set through the use of the appropriate steering wheel switches. 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 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 vehicles 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 - located in the driver door, behind the trim panel.
• Passenger door module - 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 - located at ignition key cylinder.
• RKE transmitter - located with ignition key.
• Memory seat module - located underneath the driver seat and also controls the adjustable pedals. For additional information on the MSM, refer to => [ Memory Seat Module ] Memory Seat Module.
• 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 on the upper instrument panel.
Certain functions and features of the memory system rely upon resources shared with other electronic modules in the vehicle over the CAN bus network. 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 procedure information is needed.
Operation
Power Seat System
The power seat system receives battery current through a fuse in the totally integrated power module 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.
Memory Seat System
The MSM receives battery current through a circuit breaker in the TIPM so that the power seats remain operational, regardless of the ignition switch position. When the driver memory seat switch knob is actuated, a resistance signal is sent to the MSM via the CAN bus circuit. The MSM is responsible for the 12 volt battery feed and ground path to the power seat adjuster motor. The adjuster motor operates to move the power seat adjuster 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 MSM receives memory set/position switch input through the CAN bus circuit. The MSM also receives hard wired input from the hall effect sensors, mounted on each of the driver power seat adjuster motors and the driver side view mirror motor. The programmed software in the module allows it to know where the seat/mirror is located in its designed travel by a pulse count generated from the hall effect sensors. This way, when the memory switch is depressed the module will power the seat adjuster/mirror motors until the correct preset location is achieved. The module will prevent the seat memory recall function from being initiated, if the transmission gear selector lever is not in the park position, or if the vehicle is moving. These inputs are monitored over the CAN bus circuit by the MSM.
A memory setting is saved by pressing the "set" button, then pressing either the memory "1" or "2" button within 5 seconds of pressing the "set" button.
A memory setting is recalled by pressing either the memory "1" or "2" button, or by pressing the unlock button on a "linked" RKE transmitter, also known as the key fob.
For driver safety, memorized settings can not be recalled if the transmission is in a position other than park or the seat belt is latched.
The EVIC serves as the user interface for the memory system. It displays memory system status messages and provides the user with the means for enabling and disabling the many customer programmable features available on the vehicle, including those for the memory system.