Front Row Seat - Electric Adjustment
| ITEM | DESCRIPTION |
|---|---|
| 1 | Seat backrest recline motor |
| 2 | Seat backrest recline motor |
| 3 | Seat cushion tilt motor |
| 4 | Seat cushion extension motor |
| 5 | Front row seat switchpack |
| 6 | Seat height motor |
- Electric motors are used to provide adjustment for the following:
- Seat slide
- Seat height
- Backrest recline
- Cushion tilt
- Cushion extension
- Head restraint height - If equipped.
All of the seat adjustments are controlled from the seat switchpack on the outside of the seat cushion. On vehicles without seat memory, the control switches are connected directly to the adjustment motors. On vehicles with seat memory function, the switches are connected to the adjustment motors through the driver and/or passenger seat modules. The seat module is located on the underside of each front row seat. Memory seats also have a seat memory switchpack in the related door trim panel.
The seat forward/backward motor is an integral component of the seat cushion frame. The motor drives a gear on a worm drive lead screw, which is integral with the floor rail. The lead screw has a stop at each end to limit the forward and backward seat movement.
The seat height motor is located below the seat. The motor drives a gear on a lead screw. The lead screw moves a lever mechanism, which raises or lowers the seat cushion.
The backrest recline motor is located in the backrest frame. The recline motor rotates a shaft connected to the backrest frame, which changes the angle of the backrest.
The seat cushion tilt motor is located below the seat. The seat cushion tilt motor drives a gear on a lead screw to extend or to raise the front of the seat cushion.
The head restraint motor is located in the upper section of the backrest frame and is accessible by removal of the seat back. The motor moves a cradle by a rack and pinion arrangement. The cradle has 2 head restraint stems, which raise and lower the head restraint as the motor moves the cradle.
On vehicles with seat memory function each adjustment motor contains a Hall effect position sensor. The sensors provide position feedback signals to the seat modules which are used for memory store and recall operation.
The following diagram shows the function of the seat controls:
| ITEM | DESCRIPTION |
|---|---|
| 1 | Head restraint height switch (if equipped) |
| 2 | Lumbar assembly adjustment switch |
| 3 | Seat bolster adjustment switch |
| 4 | Seat cushion extension switch |
| 5 | Seat cushion tilt and slide switch |
| 6 | Seat height adjustment switch |
| 7 | Seat forward and backward adjustment switch |
| 8 | Seat backrest recline switch |
On vehicles without seat memory function, the driver and passenger seat switchpacks are connected directly to the applicable seat adjustment motors through hardwired connections. The seat switchpacks have a fused permanent startup battery supply from the Passenger Junction Box (PJB) and a signal connection from the Rear Junction Box (RJB). The signal from the RJB is active, when the vehicle is in Power Mode 4 (Accessory).
On vehicles with seat memory feature, the front row seats have an individual module to control the seat adjustment. The seat switchpacks are connected to the related seat module through Local Interconnect Network (LIN) connection.
The driver seat switchpack is connected to the Driver Seat Module (DSM). The passenger seat switchpack is connected to the Passenger Seat Module (PSM). The DSM and the PSM receive the signals from the related seat switchpacks, then controls the operation of the required seat adjustment motor accordingly.