Toyota Venza: System Description

Toyota Venza Service Manual / Seat / Front Power Seat Control System(w/ Memory) / System Description

SYSTEM DESCRIPTION

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 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

Component		Function
Position control ECU and switch assembly		Based on the switch operation, seat adjuster signals are input to the position control ECU and switch assembly to adjust the seat accordingly.
Front seat frame with adjuster assembly LH	Slide motor	Receives a signal from the position control ECU and switch assembly, and slides the seat forward and rearward.
	Front vertical motor	Receives a signal from the position control ECU and switch assembly, and raises and lowers the front of the seat cushion.
	Lifter motor	Receives a signal from the position control ECU and switch assembly, and raises and lowers the seat cushion.
	Position sensor	Built into each motor and sends position data to the position control ECU and switch assembly so that it can detect the position at all times.
	Reclining motor	Receives a signal from the position control ECU and switch assembly, and tilts the seatback forward and rearward.
Lumbar support adjuster assembly		Receives a signal from the front lumbar power seat switch and operates the built-in motor to adjust the lumbar support.
Seat memory switch		If the seat memory 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 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 outer mirror control ECU assembly LH and the seat position changes according to memory.
Front lumbar power seat switch		Operates the motor built into lumbar support adjuster assembly according to switch operation.

3. SYSTEM OPERATION

The front power seat functions which can be operated with 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 LH. Then the information is sent to the main body ECU (driver side junction block assembly) via CAN and then an instruction to memorize the seat position is sent to the position control ECU and switch assembly via CAN. As a result, the seat position is memorized.

Precaution

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System Diagram

SYSTEM DIAGRAM Communication Table Sender Receiver Signal Line ECM Main Body ECU (Driver Side Junction Block Assembly) ...

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