Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: System Description

SYSTEM DESCRIPTION

FRONT POWER SEAT CONTROL SYSTEM DESCRIPTION

  • The driver seat is equipped with slide, reclining, lifter, front vertical, lumbar support adjustment and cushion length* functions.
  • The memory call function uses the key ID code of each electrical key transmitter sub-assembly to memorize and recall the appropriate driving position for each individual who possesses a master key or sub key.
    • *: w/ Seat Variable Cushion Switch

FUNCTION OF MAIN COMPONENT

Component

Function

Position control ECU and switch assembly LH

Receives position signals from the position sensors. Outputs seat adjuster signals to the front seat adjuster assembly LH to adjust the seat accordingly.

Front seat adjuster assembly LH

Slide motor

Receives signals from the position control ECU and switch assembly LH, and slides the seat forward and rearward.

Front vertical motor

Receives signals from the position control ECU and switch assembly LH, and raises and lowers the front of the seat cushion.

Lifter motor

Receives signals from the position control ECU and switch assembly LH, and raises and lowers the seat cushion.

Cushion length motor*

Receives a signal from the seat variable cushion switch (driver seat), and slide the seat cushion forward and rearward.

Position sensor

Built into each motor and send position signals to the position control ECU and switch assembly LH to detect the position of the seat.

Front seatback frame sub-assembly LH

Reclining motor

Receives signals from the position control ECU and switch assembly LH, and tilts the seatback forward and rearward.

Lumbar support adjuster assembly LH

Receives signals from the front lumbar power seat switch (driver seat) and operates the built-in motor to adjust the lumbar support.

Seat memory switch LH

If the SET switch is being pressed when one of the M1, M2 or M3 seat memory switches is pressed, or if one of the M1, M2 or M3 switches is pressed within 3 seconds of pressing the SET switch, the outer mirror control ECU assembly (driver door) sends the signals so that the seat position can be stored.

Then, when a seat memory switch LH is pressed, a signal is sent to the outer mirror control ECU assembly (driver door) and the seat position changes according to memory.

Front lumbar power seat switch (driver seat)

Operates the motor built into the lumbar support adjuster assembly LH according to switch operation.

  • *: w/ Seat Variable Cushion Switch

SYSTEM OPERATION

The front power seat functions which can be operated with the power seat motors and memorized are shown below.

Seat Function

Driver Seat

Slide

Power and Memory

Reclining

Power and Memory

Front Vertical

Power and Memory

Lifter

Power and Memory

Lumbar Support adjustment

Power

Cushion Length*

Power

  • *: w/ Seat Variable Cushion Switch

The seat memory switch LH sends memory switch information to the outer mirror control ECU assembly. Then the information is sent to the main body ECU (multiplex network body ECU) via CAN communication and then an instruction to memorize the seat position is sent to the position control ECU and switch assembly LH via CAN communication. As a result, the seat position is memorized.

    Parts Location
    PARTS LOCATION ILLUSTRATION *1 FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER DOOR) *2 FRONT SEAT OUTER BELT ASSEMBLY LH *3 SEAT MEMORY SWITCH LH *4 OUTER MIRROR CONTROL ECU ASS ...

    System Diagram
    SYSTEM DIAGRAM Communication Table Sender Receiver Signal Line ECM Main Body ECU (Multiplex Network Body ECU) Transmission information Shift position P signal CAN Ou ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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