POWER SEAT CONTROL SYSTEM

FUNCTION OF MAIN COMPONENTS

1. The main components in the front power seat control system (with memory function) have the following functions:

   Component	Outline
   Multiplex Tilt and Telescopic ECU	Inputs rotation angle signals from the tilt motor and telescopic motor and detects the tilt/telescopic position of the steering column. Receives signals (memorize/recall commands) from the multiplex network body ECU via CAN communication and memorizes/recalls the steering position.
   Main Body ECU (Multiplex Network Body ECU)	Receives signals from the courtesy light switch. Receives key ID signals and door lock/unlock signals. Sends memorize/recall command signals to the multiplex tilt and telescopic ECU, position control ECU assembly, front multiplex network door ECU LH/RH and air conditioning amplifier assembly.
   Certification ECU (Smart Key ECU Assembly)	Sends memory call recall command signals to the multiplex network body ECU via CAN communication.
   Front Multiplex Network Door ECU LH/RH	Inputs signals from each position sensor inside the outer rear view mirror assembly and detects the mirror surface position of the outer rear view mirror assembly. Receives signals (memorize/recall commands) from the multiplex network body ECU via CAN communication and memorizes/recalls the mirror surface position of the outer rear view mirror assembly. Sends seat memory switch operation signals to the multiplex network body ECU via CAN communication.*1
   Position Control ECU Assembly	Inputs signals from each seat adjuster position sensor for the driver seat and detects the driver seat position. Receives signals (memorize/recall commands) from the multiplex network body ECU via CAN communication and memorizes/recalls the driving position. Sounds the built-in buzzer according to signals from the multiplex network body ECU when the memorization operation completes or the recall operation starts.
   Airbag ECU Assembly	Sends driver seat buckle switch signals from the driver seat belt buckle switch to the multiplex network body ECU via CAN communication.
   Central Gateway ECU (Network Gateway ECU)	Relays CAN communication signals.
   ECM	Sends shift position signals to the multiplex network body ECU via CAN communication.
   Seat Memory Switch	Outputs "SET", "1", "2" and "3" switch operation signals to the front multiplex network door ECU LH/RH.
   Courtesy Light Switch	Detects whether the driver door is open or closed and outputs the result to the multiplex network body ECU.
   Front Power Seat Switch LH/RH	Sends length signals, which indicate the operation time of each seat adjuster switch of the driver seat, to the position control ECU assembly.
   Front Seat Inner Belt Assembly LH/RH	Detects whether the driver's seat belt is fastened or unfastened and outputs the result to the airbag ECU assembly.
   Headup Display (Meter Mirror Sub-assembly)*2 Meter Mirror ECU	Receives signals from ECUs and switches and projects vehicle information onto the windshield glass.
   DLC3	The DTCs of malfunctioning parts can be read by connecting a diagnostic tool.

   Tech Tips

   *1: Front Multiplex Network Door ECU LH only (LHD models)/Front Multiplex Network Door ECU RH only (RHD models)

   *2: Models with headup display

OPERATING CONDITION

1. Memory Function (Driver Seat)

   
   

   1. The memory, recall and and seat slide back conditions of the memory function are as follows:

      Function	Condition	Operation	Action
      Memory	Engine switch is on (IG).	Switch "1", "2" or "3" is pressed while the "SET" switch is pressed.	Memorizes the seat position when switch "1", "2" or "3" is pressed. When the memory setting is completed, the buzzer will sound for 0.5 seconds.
      		Switch "1", "2" or "3" is pressed within 3 seconds after the "SET" switch is pressed.
      Recall	Engine switch is on (IG). Shift position is P. Memory switch is off. Seat position is memorized.	Switch "1", "2" or "3" is pressed.	Recalls the seat position that was memorized in the position control ECU (front power seat switch).
      	Engine switch is off. Memory switch is off. Seat position is memorized. Driver door is opened.	Switch "1", "2" or "3" is pressed within 180 seconds after the engine switch is turned off and the driver door is opened.
      	Engine switch is off. Memory switch is off. Seat position is memorized. Open driver door is closed.	Switch "1", "2" or "3" is pressed within 60 seconds after the engine switch is turned off and the open driver door is closed.

2. Lever-operated "Front, Fold and Return" Function

   
   

   1. The lever operated "Front, Fold and Return" function will not operate in the following situations:

      
      

      • The front seat belt of the seat to be operated is fastened.

      • The engine switch is on (IG) and the shift position is in a position other than P (driver seat only).

   2. Operation of the lever-operated "Front, Fold and Return" function will stop in the following situations:

      
      

      • A power seat adjusting switch or a driving position memory switch is pressed.

      • The front seat belt of the seat which is operating is fastened.

      • The engine switch is on (IG) and the shift position is moved to a position other than P (driver seat only).

FUNCTION

1. Memory Function

   
   

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

      Function		Outline
      Power Control		The fore-and-aft slide, reclining, front vertical, lifter and lumbar support can be adjusted using the 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 recall the optimal driving position for a person possessing the key.

      Tech Tips

      *: Only for driver seat

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

      System	Outline
      Power Tilt and Telescopic System	The multiplex tilt and telescopic ECU memorizes the steering column position and recalls it when all conditions are met.
      Outside Rear View Mirror System	The front multiplex network door ECU LH memorizes the outside rear view mirror positions and recalls them when all conditions are met.
      Headup Display System*	The headup display memorizes its position and recalls it when all conditions are met.

      Tech Tips

      *: Models with headup display

2. Lever-operated "Front, Fold and Return" Function

   Function	Operation	Action
   Front and Fold	Pull the reclining lever	The lock of the seatback is released. The position control ECU receives a position signal from the Hall IC of the sliding motor and lifter motor and memorizes the current seat position. The lift motor operates to lower the seat to prevent interference with the roof lining.
   	Fold the seatback completely forward	The front seat will moves forward.
   Return	Move the seatback backward until it locks	The front seat returns to its original position automatically.

   Tech Tips

   Quickly creates entry and exit space when the seatback is manually reclined.

OPERATION

DIAGNOSIS

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

3. The 5-digit DTCs can be read by connecting the TechStream to the DLC3. For details, refer to the Repair Manual.