POWER SEAT CONTROL SYSTEM

FUNCTION OF MAIN COMPONENTS

1. The main components in the front power seat control system have the following functions:

   Component	Outline
   Front Power Seat Switch Assembly Position Control ECU	Operates the front power seat. Operates the motors in accordance with the signals from the front power seat switch assembly. Registers and recalls seat positions in accordance with the operation of the seat memory switch. Operates the automatic away and automatic return function.
   Seat Memory Switch	Operates the seat position memory function.
   Main Body ECU (Multiplex Network Body ECU)	Various signals are transmitted and received via the Controller Area Network (CAN). Outputs shift position signals to the position control ECU.
   Certification ECU (Smart Key ECU Assembly)	Sends memory call recall command signals to the main body ECU via CAN communication.
   Outer Mirror Control ECU (Driver Side/Front Passenger Side)	Receives signals from the position control ECU and memorizes and recalls the outer mirror surface position. The driver side outer mirror control ECU sends seat memory switch operating signals to the main body ECU.
   ECM	Transmits the shift position signal to the main body ECU.

2. On models with executive lounge captain seat, the main components in the rear power seat control system have the following functions:

   Component	Outline
   Rear Power Seat Switch (RH/LH)	Operates the rear power seat control system.
   Rear Power Seat Switch (Walk-in / Walk-in Return)
   Rear Power Seat Return Switch
   Position Control ECU Assembly (RH/LH)	Detects the position information of the seat adjuster motors. Controls the seatback, ottoman and slide lock functions. The buzzer simultaneously sounds when the system operates or the malfunction occurs.
   Main Body ECU (Multiplex Network Body ECU)	Outputs shift position and power source signals to the position control ECU assemblies.
   No. 1 Rear Seat Inner Belt Assemblies	Detect the condition of the seat belt and outputs it to the position control ECU assembly of each seat.
   Occupant Detection Sensor	Detects whether an occupant is seated in the No. 1 rear seat and outputs the result to the position control ECU assembly of each seat.

OPERATING CONDITION

1. Memory Function

   
   

   1. The memory function are as follows:

      Function	Condition	Operation
      Memory	Either of the following conditions is met while the engine switch is on (IG): Button 1, 2 or 3 (seat memory switch) is pushed while the "SET" button is pushed. Button 1, 2 or 3 (seat memory switch) is pushed within 3 seconds after the "SET" button is pushed.	Stores the seat position. When the memory setting is completed, the buzzer sound for 0.5 seconds.
      Recall	Engine switch is off. Button 1, 2 or 3 (seat memory switch) is pushed within 180 seconds after the driver door has been opened while the engine switch is off. Button 1, 2 or 3 (seat memory switch) is pushed.	The seat position that was memorized in the position control ECU assembly is recalled.
      	Engine switch is on (IG). Shift position is in P Button 1, 2 or 3 (seat memory switch) is pushed.
      	Button 1, 2 or 3 (seat memory switch) is pushed within 60 seconds after the engine switch has been turned off and the driver door has been closed.
      Memory Call	A key ID is registered to button 1, 2 or 3. Engine switch is off. The inside of the outside door handle is touched or the electrical key transmitter sub-assembly unlock button is pushed to unlock, and then the driver door is opened.	The seat position that was memorized in the position control ECU assembly is recalled.
      Automatic Away	Engine switch is off. Driver seat belt is not in use.	The seat automatically moves rearward up to 50 mm (1.97 inch). The lumbar support moves to the rear most position.
      Automatic Return	Seat is in automatic away position. Engine switch is turned on (ACC) or on (IG).	The seat automatically returns to the previous seat position. If the position control ECU determines that the driver seat will interfere with the retractable table while the automatic away function is operating, the automatic away function stops and the buzzer (built into the front power seat switch assembly) sounds simultaneously.
      	Seat is in automatic away position. Front driver side seat inner belt assembly is on.

2. Rear Power Seat System

   
   

   1. The rear memory function are as follows

      Function	Condition	Operation
      Memory	Either of the following conditions is met while the engine switch is on (IG): Button 1 or 2 (seat memory switch) is pushed while the "SET" button is pushed. Button 1 or 2 (seat memory switch) is pushed within 3 seconds after the "SET" button is pushed.	Stores the seat position. When the memory setting is completed, the buzzer sound for 0.5 seconds.
      Recall	Engine switch is on (IG). Button 1, 2 (seat memory switch) is pushed.	The seat position that was memorized in the position control ECU is recalled.

FUNCTION

1. Memory Function

   
   

   1. The power seat control system has the following functions:

      Function		Outline
      Manual Control		The user can perform seat slide, seat reclining, front vertical and seat lifter adjustments by operating the front power seat switch.
      Memory	Memory	The memory function can memorize 3 different seat positions.
      	Recall	The recall function can recall 3 different memorized seat positions.
      	Memory Call	The memory call function, which utilizes the key IDs, is used to memorize and retrieve the optimal driving positions for a person possessing the electrical key transmitter sub-assembly.
      	Automatic Away	The seat slide move to the rearward, making it easier to exit the vehicle.
      	Automatic Return	The automatic return function automatically returns the seat to the previous position before starting the vehicle.

   2. The memory function works in combination with the following systems, ensuring usability and enabling easy entering or exiting of the vehicle.

      System	Outline
      Outside Rear View Mirror System	The outer mirror control ECUs memorize the outside rear view mirror positions and recalls them when all conditions are met.

2. Rear Power Seat System

   
   

   1. The fold down seat system has the following functions:

      Function		Outline
      Manual Control		The user can perform seat slide lock/unlock, seat reclining, and ottoman reclining adjustments by operating the slide lock control lever or rear control switch.
      Memory	Memory	The memory function can memorize 2 different seat positions.
      	Recall	The recall function can recall 2 different memorized seat positions.

OPERATION

DIAGNOSIS

1. The position control ECU (front power seat switch) has a diagnosis function. It stores a record of any power seat control system malfunctions in its memory in the form of Diagnostic Trouble Codes (DTCs).

2. The position control ECU (front power seat switch) outputs malfunction data and 5-digit DTCs to the Global TechStream (GTS).

3. The 5-digit DTCs can be read after connecting the Global TechStream (GTS) to the DLC3. For details, refer to the Repair Manual.