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Home >> Lexus >> 2017 >> GS 450h Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Front Power Seat Control System (Diagnostics - Introduction) >> Front Power Seat Control System >> System Description [09/2014 - ] >> System Description [09/2014 - ]
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System Description [09/2014 - ]

  1. FRONT POWER SEAT CONTROL SYSTEM DESCRIPTION 
    • The driver seat is equipped with slide, reclining, lifter, front vertical, lumbar support adjustment, pelvis support*1, *2, cushion length*1, *2, side support*1, *2 and front seat back adjustment*2 functions.
      • *1: for Sports Seat Type
      • *2: for Luxury Seat Type
    • The passenger seat is equipped with slide, reclining, lifter, front vertical, lumbar support adjustment, pelvis support*, cushion length*, side support* and front seat back adjustment* functions.
      • *: for Luxury Seat Type
    • The memory call function uses the key ID code of the key to memorize and recall the appropriate driving position for each individual who possesses a master key or sub key.
  2. FUNCTION OF MAIN COMPONENT 
    FOR DRIVER SIDE, STANDARD SEAT TYPE

    Component Function
    Power seat switch assembly Based on the switch operation, seat adjuster signals are input to the power seat switch assembly to adjust the seat accordingly.
    Front seat adjuster assembly LH Slide motor Receives a signal from the power seat switch assembly, and slides the seat forward and rearward.
    Front vertical motor Receives a signal from the power seat switch assembly, and raises and lowers the front of the seat cushion.
    Lifter motor Receives a signal from the power seat switch assembly, and raises and lowers the seat cushion.
    Position sensor Built into each motor and sends position data to the power seat switch assembly so that it can detect seat positions at all times.
    Power seat reclining motor assembly Reclining motor Receives a signal from the power seat switch assembly, and tilts the seatback forward and rearward.
    Position sensor Built into the reclining motor and sends position data to the power seat switch assembly so that the ECU can detect seat positions at all times.
    Lumbar support adjuster assembly LH Lumbar motor Receives a signal from the front lumbar power seat switch and operates the motor to adjust lumbar support.
    Seat memory switch If the seat memory 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 front multiplex network door ECU LH 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 front multiplex network door ECU LH and the seat position changes according to memory.
    Front lumbar power seat switch Operates the lumbar support adjuster assembly LH (lumbar motor) according to switch operation.
    FOR DRIVER SIDE, SPORTS SEAT TYPE, LUXURY SEAT TYPE

    Component Function
    Position control ECU assembly Based on the switch operation, seat adjuster signals are input to the position control ECU assembly to adjust the seat accordingly.
    Front seat adjuster assembly LH Slide motor Receives a signal from the position control ECU assembly, and slides the seat forward and rearward.
    Front vertical motor Receives a signal from the position control ECU assembly, and raises and lowers the front of the seat cushion.
    Lifter motor Receives a signal from the position control ECU assembly, and raises and lowers the seat cushion.
    Cushion motor Receives a signal from the position control ECU assembly, and slides the seat cushion forward and rearward.
    Position sensor Built into each motor and sends position data to the position control ECU assembly so that it can detect seat positions at all times.
    Power seat reclining motor assembly Reclining motor Receives a signal from the position control ECU assembly, and tilts the seatback forward and rearward.
    Position sensor Built into the reclining motor and sends position data to the position control ECU assembly so that the ECU can detect seat positions at all times.
    Lumbar support adjuster assembly LH Lumbar motor Receives a signal from the position control ECU assembly and operates the motor to adjust lumbar support.
    Pelvis motor Receives a signal from the position control ECU assembly and operates the motor to adjust pelvis support.
    Position sensor Built into each motor and sends position data to the position control ECU assembly so that it can detect seat positions at all times.
    Front seat back support LH Side support motor Receives a signal from the position control ECU assembly and operates the motor to adjust side support.
    Position sensor Built into the side support motor and sends position data to the position control ECU assembly so that the ECU can detect seat positions at all times.
    Front seat back adjuster assembly* Front seat back adjuster motor Receives a signal from the position control ECU assembly and operates the motor to adjust front seat back support.
    Position sensor Built into the side support motor and sends position data to the position control ECU assembly so that the ECU can detect seat positions at all times.
    Seat memory switch If the seat memory 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 front multiplex network door ECU LH 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 front multiplex network door ECU LH and the seat position changes according to memory.
    • *: for Luxury Seat Type
    FOR FRONT PASSENGER SIDE, STANDARD SEAT TYPE, SPORTS SEAT TYPE

    Component Function
    Power seat switch assembly Based on the switch operation, seat adjuster signals are input to the power seat switch assembly to adjust the seat accordingly.
    Front seat adjuster assembly RH Slide motor Receives a signal from the power seat switch assembly, and slides the seat forward and rearward.
    Front vertical motor Receives a signal from the power seat switch assembly, and raises and lowers the front of the seat cushion.
    Lifter motor Receives a signal from the power seat switch assembly, and raises and lowers the seat cushion.
    Power seat reclining motor assembly Reclining motor Receives a signal from the power seat switch assembly, and tilts the seatback forward and rearward.
    Lumbar support adjuster assembly RH Lumbar motor Receives a signal from the front lumbar power seat switch and operates the motor to adjust lumbar support.
    Front lumbar power seat switch Operates the lumbar support adjuster assembly RH (lumbar motor) according to switch operation.
    FOR FRONT PASSENGER SIDE, LUXURY SEAT TYPE

    Component Function
    Position control ECU assembly Based on the switch operation, seat adjuster signals are input to the position control ECU assembly to adjust the seat accordingly.
    Front seat adjuster assembly RH Slide motor Receives a signal from the position control ECU assembly, and slides the seat forward and rearward.
    Front vertical motor Receives a signal from the position control ECU assembly, and raises and lowers the front of the seat cushion.
    Lifter motor Receives a signal from the position control ECU assembly, and raises and lowers the seat cushion.
    Cushion motor Receives a signal from the position control ECU assembly, and slides the seat cushion forward and rearward.
    Position sensor Built into each motor and sends position data to the position control ECU assembly so that it can detect seat positions at all times.
    Power seat reclining motor assembly Reclining motor Receives a signal from the position control ECU assembly, and tilts the seatback forward and rearward.
    Position sensor Built into the reclining motor and sends position data to the position control ECU assembly so that the ECU can detect seat positions at all times.
    Lumbar support adjuster assembly RH Lumbar motor Receives a signal from the position control ECU assembly and operates the motor to adjust lumbar support.
    Pelvis motor Receives a signal from the position control ECU assembly and operates the motor to adjust pelvis support.
    Position sensor Built into each motor and sends position data to the position control ECU assembly so that it can detect seat positions at all times.
    Front seat back support RH Side support motor Receives a signal from the position control ECU assembly and operates the motor to adjust side support.
    Position sensor Built into the side support motor and sends position data to the position control ECU assembly so that the ECU can detect seat positions at all times.
    Front seat back adjuster assembly Front seat back adjuster motor Receives a signal from the position control ECU assembly and operates the motor to adjust front seat back support.
    Position sensor Built into the side support motor and sends position data to the position control ECU assembly so that the ECU can detect seat positions at all times.
    Seat memory switch If the seat memory 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 front multiplex network door ECU RH 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 front multiplex network door ECU RH and the seat position changes according to memory.
  3. SYSTEM OPERATION 

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

    1. Seat position memory and restoring function
      Seat Adjustment Function Driver Seat (for Standard Seat Type) Driver Seat (for Luxury Seat Type) Passenger Seat (for Luxury Seat Type)
      Sliding ◦ ◦ ◦
      Reclining ◦ ◦ ◦
      Front Vertical ◦ ◦ ◦
      Lifter ◦ ◦ ◦
      Lumbar Support X ◦ ◦
      Cushion Length - ◦ ◦
      Pelvis Support - ◦ ◦
      Side Support - ◦ ◦
      Front seat back adjuster - ◦ ◦
    2. Memory call function
      Seat Adjustment Function Driver Seat (for Standard Seat Type) Driver Seat (for Luxury Seat Type) Passenger Seat (for Luxury Seat Type)
      Sliding ◦ ◦ X
      Reclining ◦ ◦ X
      Front Vertical ◦ ◦ X
      Lifter ◦ ◦ X
      Lumbar Support X ◦ X
      Cushion Length - ◦ X
      Pelvis Support - ◦ X
      Side Support - ◦ X
      Front seat back adjuster - ◦ X
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