Toyota 4Runner: System Description

Toyota 4Runner Service Manual / Vehicle Interior / 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 passenger seat is equipped with slide and reclining adjustment functions.

2. FUNCTION OF MAIN COMPONENT

The following functions are available.

Components	Function
Seat slide motor	Receives a signal from the front power seat switch and slides the seat forward and rearward.
Seat reclining motor	Receives a signal from the front power seat switch and reclines and returns the seatback.
Seat front vertical motor	Receives a signal from the front power seat switch and raises and lowers the front of the seat cushion.
Seat lifter motor	Receives a signal from the front power seat switch and raises and lowers the seat cushion.
Lumbar support motor	Receives a signal from the power seat switch assembly and adjusts the lumbar support adjuster.
Seat position sensor	Is built into each power seat motor and sends position data to the front power seat switch LH so that the ECU can detect the seat position at all times.
Front power seat switch	Based on the switches operated, seat adjuster signals are input into the front power seat switch LH and the seat is adjusted accordingly (for driver side). Directly sends seat adjuster signals to each power seat motor (for passenger side).
Power seat switch assembly	Directly sends seat adjuster signals to the lumbar support motor.
Seat memory switch	When the SET switch and memory switch are pressed simultaneously, a signal is input to the main body ECU (multiplex network body ECU) and the seat position is recorded. Then, when the memory switch is pressed, a signal is input to the main body ECU (Multiplex Network Body ECU) and the seat position changes according to memory.

3. SYSTEM OPERATION

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

Seat Adjustment Function	Driver Seat	Passenger Seat
Sliding	Power and memory	Power
Reclining	Power and memory	Power
Front Vertical	Power and memory	-
Lifter	Power and memory	-
Lumbar Support	Power	-

For the memory function, the memory switch operation signal is first sent from the main body ECU (multiplex network body ECU) to the front power seat switch LH via the CAN communication line. Then, either the seat position is recorded in memory or a previously recorded seat position is recalled.

Parts Location

PARTS LOCATION ILLUSTRATION ILLUSTRATION ILLUSTRATION ...

System Diagram

SYSTEM DIAGRAM Communication Table Sender Receiver Signal Line ECM Main Body ECU (Multiplex Network Body ECU) ...

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