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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System (W/ Memory) - Diagnostics - Introduction >> FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) >> System Description [12/2019 - ] >> System Description [12/2019 - ]

System Description [12/2019 - ]

  1. FRONT POWER SEAT CONTROL SYSTEM DESCRIPTION 
    • The driver seat is equipped with slide, reclining, lifter, front vertical and lumbar support adjustment 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.
  2. FUNCTION OF MAIN COMPONENT 
    Component Function
    Position control ECU assembly Receives position signals from the position sensors. Outputs seat adjuster signals to the separate type front seat cushion spring assembly, separate type front seatback spring assembly or lumbar support adjuster assembly LH to adjust the seat accordingly.
    Separate type front seat cushion spring assembly Slide motor Receives signals from the position control ECU assembly, and slides the seat forward and rearward.
    Front vertical motor (Power Seat Tilt Motor Assembly LH) Receives signals from the position control ECU assembly, and raises and lowers the front of the seat cushion.
    Lifter motor (Power Seat Lifter Motor Assembly LH) Receives signals from the position control ECU assembly, and raises and lowers the seat cushion.
    Separate type front seatback spring assembly Reclining motor Receives signals from the position control ECU assembly, and tilts the seatback forward and rearward.
    Position sensor Built into each motor and send position signals to the position control ECU assembly to detect the position of the seat.
    Lumbar support adjuster assembly LH Receives signals from the position control ECU assembly and operates the built-in motor to adjust the lumbar support.
    Seat memory switch If the SET switch is being pressed when one of the M1 or M2 seat memory switches is pressed, or if one of the M1 or M2 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 is pressed, a signal is sent to the outer mirror control ECU assembly (driver door) and the seat position changes according to memory.
  3. SYSTEM OPERATION 

    The front power seat functions which can be operated by 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

    The seat memory switch sends memory switch information to the outer mirror control ECU assembly (driver door). 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 assembly via CAN communication. As a result, the seat position is memorized.

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