Lexus ES300 (2002 year). Service manual - part 31

228

Power Seat (Driver’s Seat w/ Driving Position Memory)

Current is always applied from ECU–B fuse to TERMINAL SYSB of the memory seat ECU, from PWR SEAT fuse to
TERMINAL +B of the memory seat ECU.
With the ignition SW turned on, current flows from ECU–IG fuse to TERMINAL IG of the memory seat ECU and from the
GAUGE2 fuse to TERMINAL 3 of the A/T indicator light SW.

Power Seat Operation (Driver’s Seat)

Current is always applied to TERMINAL SYSB and TERMINAL +B of the memory seat ECU so that memory seat ECU is
always ready to operate.
When the power seat control SW is pushed to the ”FRONT SLIDE position” side, a signal is input into TERMINAL SLDF of
the memory seat ECU, the ECU operates and the current to TERMINAL +B of the memory seat ECU flows from TERMINAL
SLD+ of the memory seat ECU to TERMINAL 2 of the power seat motor (Driver’s seat slide control) to TERMINAL 1 to
TERMINAL SLD– of the memory seat ECU to TERMINAL GND to GROUND, rotating the power seat motor so that the seat
slides forward while the power seat control SW is being pressed.
To slide the driver’s seat to the rear, pushing the power seat control SW to the ”REAR SIDE position” side, inputs a signal to
TERMINAL SLDR of the memory seat ECU. This causes the current flowing from the ECU to the motor to flow from
TERMINAL SLD– of the memory seat ECU to TERMINAL 1 of the power seat motor (Driver’s seat slide control) to
TERMINAL 2 to TERMINAL SLD+ of the memory seat ECU, flowing the reverse to front slide operation and causing the
motor to rotate in reverse, so that the driver’s seat moves to the rear.

The movement to other positions occurs similarly, so only the flow of current to each motor is shown:

Front Vertical Control Up Operation

TERMINAL +B of the memory seat ECU to TERMINAL FRV+ to TERMINAL 1 of the power seat motor (Driver’s seat front
vertical control) to TERMINAL 2 to TERMINAL FRV– of the ECU to TERMINAL GND to GROUND.

Front Vertical Control Down Operation

TERMINAL +B of the memory seat ECU to TERMINAL FRV– to TERMINAL 2 of the power seat motor (Driver’s seat front
vertical control) to TERMINAL 1 to TERMINAL FRV+ of the ECU to TERMINAL GND to GROUND.

Lifter Control Up Operation

TERMINAL +B of the memory seat ECU to TERMINAL RRV+ to TERMINAL 1 of the power seat motor (Driver’s seat lifter
control) to TERMINAL 2 to TERMINAL RRV– of the ECU to TERMINAL GND to GROUND.

Lifter Control Down Operation

TERMINAL +B of the memory seat ECU to TERMINAL RRV– to TERMINAL 2 of the power seat motor (Driver’s seat lifter
control) to TERMINAL 1 to TERMINAL RRV+ of the ECU to TERMINAL GND to GROUND.

Reclining Control Front Operation

TERMINAL +B of the memory seat ECU to TERMINAL RCL+ to TERMINAL 2 of the power seat motor (Driver’s seat
reclining control) to TERMINAL 1 to TERMINAL RCL– of the ECU to TERMINAL GND to GROUND.

Reclining Control Rear Operation

TERMINAL +B of the memory seat ECU to TERMINAL RCL– to TERMINAL 1 of the power seat motor (Driver’s seat
reclining control) to TERMINAL 2 to TERMINAL RCL+ of the ECU to TERMINAL GND to GROUND.

Making it possible to perform memory and return functions for the seat position using the seat memory switch.

System Outline

229

A4  A/T Indicator Light SW

3–1 : Closed with the shift lever at P position

M6 (A), M7 (B)  Memory Seat ECU

(A)10–Ground : Always approx. 12 volts
(B)10–Ground : Approx. 12 volts with the ignition SW at ON position and the shift lever at P position
(A) 5–Ground : Approx. 12 volts with the driver’s seat at front slide operation
(A) 4–Ground : Approx. 12 volts with the driver’s seat at rear slide operation
(A)12–Ground : Approx. 12 volts with the driver’s seat at front vertical up operation
(A)11–Ground : Approx. 12 volts with the driver’s seat at front vertical down operation
(A) 8–Ground : Approx. 12 volts with the driver’s seat at lifter up operation
(A) 7–Ground : Approx. 12 volts with the driver’s seat at lifter down operation
(A) 3–Ground : Approx. 12 volts with the driver’s seat at front reclining operation
(A) 2–Ground : Approx. 12 volts with the driver’s seat at rear reclining operation
(A) 9–Ground : Always continuity
(B)24–Ground : Always approx. 12 volts

P14  Power Seat Control SW (Driver’s Seat)

1–3 : Closed with the driver’s seat at front reclining operation
1–2 : Closed with the driver’s seat at rear reclining operation
1–9 : Closed with the driver’s seat at front slide operation
1–6 : Closed with the driver’s seat at rear slide operation

1–10 : Closed with the driver’s seat at front vertical up operation

1–5 : Closed with the driver’s seat at front vertical down operation
1–7 : Closed with the driver’s seat at lifter up operation
1–8 : Closed with the driver’s seat at lifter down operation

  :  Parts Location

Code

See Page

Code

See Page

Code

See Page

A4

36

M2

39

P17

42

D8

40

M6

A

42

P18

42

D18

40

M7

B

42

P19

42

J3

39

P13

42

P20

42

J6

A

39

P14

42

J7

B

39

P16

42

: Junction Block and Wire Harness Connector

Code

See Page

Junction Block and Wire Harness (Connector Location)

2B

28

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

2J

28

Floor No 1 Wire and Driver Side J/B (Lower Finish Panel)

2K

28

Floor No.1 Wire and Driver Side J/B (Lower Finish Panel)

2P

29

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

3A

34 (w/ VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3A

35 (w/o VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IA4

46

Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)

IC1

46

Front Door LH Wire and Floor No.1 Wire (Left Kick Panel)

IL1

48

Engine Wire and Instrument Panel Wire (Behind the Glove Box)

IL2

48

Engine Wire and Instrument Panel Wire (Behind the Glove Box)

BD1

52

Floor No.1 Wire and Front Seat LH Wire (Under the Driver’s Seat)

: Ground Points

Code

See Page

Ground Points Location

BA

50

Under the Driver’s Seat

Service Hints

230

Power Seat (Driver’s Seat w/ Driving Position Memory)

: Splice Points

Code

See Page

Wire Harness with Splice Points

Code

See Page

Wire Harness with Splice Points

B22

52

Front Seat LH Wire

232

Power Seat (Driver’s Seat w/o Driving Position Memory)

M

2

1

Po

w

e

r 

Se

a

t M

o

to

r

(D

ri

v

er

’

s

 S

eat

 Lum

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 S

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rt

 C

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P1

8

30A
PWR SEAT

From Power Source System (See Page 56)

2J

1

BD1

1

L–

O

L–

O

L–

O

1

2

Fr

o

n

t

R

ear

B23

1

4

2

3

B23

L

LG

L

L–O

L–

O

BA

1

2

M

Power Seat Control SW (Driver’ s Seat)

P14

10

5

9

6

3

2

7

8

4

M

2

1

P1

9

Po

w

e

r 

Se

a

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(D

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’

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eat

 R

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clin

in

g

 C

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1

B

W–

B

L–

R

L–

W

L

L–

B

R–

W

R–

B

L–

Y

R

W–

B

RCLR

R

ear

RCLF

F

ront

SLDR

SLDF

FDWN

FUP

LUP

LDWN

E

F

ront

Do

w

n

R

ear

Up

Up

Do

w

n

P2

0

Po

w

e

r 

Se

a

t M

o

to

r

(D

ri

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’

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 S

eat

 S

lide C

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M

1

2

P1

6

Po

w

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Se

a

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(D

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’

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 S

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 F

ront

 V

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ic

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 C

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M

1

2

Po

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 Li

ft

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P1

7

BD1

10

W–

B

L–

R

L

R–

W

L–

Y

Power Seat Control SW

(Driver’ s Seat Lumbar
 Support Control)

P13

Front Vertical

Slide

Reclining

Lifter

W–

B