SEAT: FRONT POWER SEAT CONTROL SYSTEM: SYSTEM DESCRIPTION (2008 LX570)

SYSTEM DESCRIPTION

1. FRONT POWER SEAT CONTROL SYSTEM DESCRIPTION

The driver seat is equipped with slide, reclining, lifter, front vertical, variable and lumbar support adjustment functions.
The passenger seat is equipped with slide, reclining, lifter, front vertical and lumbar support adjustment functions.
The memory call function uses the key ID code of the key to memorize and reproduce the appropriate driving position for each individual who possesses a master key or sub key.

2. FUNCTION OF MAIN COMPONENT

The following functions are available.

Component	Function
Seat slide motor	Receives signal from front power seat switch, and slides seat forward and rearward.
Seat reclining motor	Receives signal from front power seat switch, and tilts and reclines seat.
Seat front vertical motor	Receives signal from front power seat switch, and raises and lowers front of seat cushion.
Seat lifter motor	Receives signal from front power seat switch, and raises and lowers seat cushion.
Seat variable cushion motor	Receives signal from seat variable cushion switch and varies length of driver side seat cushion.
Lumbar support adjuster motor	Activated based on signal from lumbar support switch. Adjusts lumbar support.
Seat control switch	Based on switches operated, seat adjuster signals are input into position control ECU and seat is adjusted accordingly.
Seat memory switch	When seat memory SET switch and seat memory switch are pressed simultaneously, signal is input to outer mirror control ECU and seat position is recorded. Then, when seat memory switch is pressed, signal is input to outer mirror control ECU and seat position changes according to memory.

3. SYSTEM OPERATION

The front power seat functions which can be adjusted with power seat motors and/or memorized are shown in the chart below.

Seat Adjustment Function	Driver Seat	Passenger Seat
Fore-and-Aft Slide	Power and memory	Power
Reclining	Power and memory	Power
Front Vertical Height	Power and memory	Power
Lifter	Power and memory	Power
Variable	Power	-
Lumbar support	Power	Power

For the driver side memory function, the seat memory switch operation is first transferred from the outer mirror control ECU to the position control ECU and switch via the CAN communication line. Then, either the seat position is stored in memory or a previously stored seat position is recalled.