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Home >> Lexus >> 2011 >> IS 250C Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Front Power Seat Control (Diagnostics & Circuit Tests)) >> FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System) >> System Description >> System Description
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System Description

WARNING: This page is about a different car, the 2011 Lexus IS 350 and 2011 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  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 system for the front seats is optional. With the memory function, the front power seat switch (position control ECU) performs the following: 1) controls the slide, reclining, lifter, and front vertical motors; 2) memorizes the seat position; and 3) operates the seat restoring operation.
    • The memory call function uses the key ID code of the electrical key to memorize and reproduce the appropriate driving position for each individual who possesses an electrical key.
  2. FUNCTION OF MAIN COMPONENT 

    The following functions are available:

    Components Function
    Power seat motor assembly (slide motor) Activated based on a signal from the position control ECU and slides the seat forward and rearward.
    Power seat motor assembly (reclining motor) Activated based on a signal from the position control ECU and tilts and reclines the seat.
    Power seat motor assembly (front vertical motor) Activated based on a signal from the position control ECU and raises and lowers the seat cushion front vertically.
    Power seat motor assembly (lifter motor) Activated based on a signal from the position control ECU and raises and lowers the seat cushion vertically.
    Lumbar support adjuster motor Activated based on a signal from the lumbar front power seat switch and adjusts lumbar support.
    Front power seat switch (reclining, lifter, slide, front vertical) Based on switches operated, seat adjuster signals are input in the position control ECU and the seat is adjusted accordingly.
    Lumbar front power seat switch Based on switches operated, the seat is adjusted accordingly.
    Seat memory switch LH (driver side) (SET switch, memory switch) When the M1, M2 or M3 switch are pressed while the SET switch being pressed, or M1, M2, or M3 switch is pressed within 3 seconds after the SET switch being pressed, a signal is input to the outer mirror control ECU LH and sent to the position control ECU, which records the seat position, steering wheel position (tilt & telescopic), and outer mirror position (RH and LH).
    When the M1, M2, or M3 switch is pressed, a signal is input to the outer mirror control ECU LH and sent to the position control ECU, which changes the seat position, steering wheel position (tilt & telescopic), and outer mirror position (RH and LH) to each recorded position.
  3. SYSTEM OPERATION 

    The front power seat adjustment and position memory are shown in the chart below.

    Seat Adjustment Function Driver
    Fore-and-Aft Slide Power and memory
    Reclining Power and memory
    Front Vertical Height Power and memory
    Lifter Power and memory
    Lumbar Support Power
    • For the driver side memory function, the memory switch operation is first transferred from the outer mirror control ECU LH to the front power seat switch LH (position control ECU) via the multiplex communication line. Then, either the seat position is stored in memory or a previously stored seat position is recalled.
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