Lexus ES300 (1997 year). Manual - part 634

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

IF1

4

ID1

5

BS2

3

BS2

4

BS2

1

BS2

2

1W

3

1V

10

B

20

B

22

B

9

B

8

B

18

B

13

B

14

B

19

B

15

B

17

B

16

B

12

BR

W–

R

W–

R

W–

R

B–

R

B

–

R

B–

R

B

–

R

G–

W

R–

G

G

G–

B

G–

W

Y–

G

L–

R

L–

Y

L

L–

B

R–

G

W–R

SEAT POSITION CONTROL ECU

B

S14

, S15

A

W–

R

W

DOOR COURTES
SW  FRONT LH

D 9

SYSB

DCTY

RCLF

RCLR

RDWN

RUP

FDWN

FUP

SLDF

SLDR

IG

STOP

B 1

G–W

G–W

G–

W

G

–

W

TO

 L

IG

H

T

F

A

IL

URE

 S

E

NS

O

R

B 1

R–G

R–

G

FROM
INTEGRATION
RELAY

1

Y

B

B

JU

N

C

T

IO

N

C

O

NNE

CT

O

R

J 3

C

C

J

UNC

T

IO

N

CO

NN

E

C

T

O

R

J 5

1

2

S

T

OP

 L

IGH

T

 S

W

S1

0

POWER SEAT CONTROL SW
(DRIVER’ S SEAT)

P15

1

5

3

2

9

10

8

4

12

RCLF

RCLR

RDWN

RUP

FDWN

FUP

SLDF

SLDR

RE

C

L

IN

IN

G

R

EAR

VER

T

IC

A

L

FR

O

N

T

VER

T

IC

A

L

SL

ID

E

FR

O

N

T

R

EAR

DO

W

N

UP

DO

W

N

UP

FR

O

N

T

R

EAR

10A
ECU–B

2J

7

15A
STOP

1C

7

15A
ECU–IG

1D

8

1R

4

1S

2

132

POWER SEAT

IK2

2

B

B

A

A

2

BS2

10

IK2

4

B

3

B

11

B

21

B16

B16

B16

B16

B16

B16

BS2

9

IH

A

D

B

F

B

4

B

1

B

10

B

2

BR

BR

BR

BR

BR

R–L

R–L

R–

L

R–

L

G–

W

G–

W

V–

W

GR

LG

–

B

LG

–R

LG

BR

V–

W

V

–

W

V–

W

GR

V–

W

LG

–

B

V–

W

LG

–

R

V–

W

LG

BR

BR

BR

BR

BR

SEAT POSITION CONTROL ECU

B

S14

, S15

A

JUNCTION
CONNECTOR

J30

POSITION SW
ARK/NEUTRAL
OSITION SW]

P 1

JU

N

C

T

IO

N

CO

N

N

E

C

T

O

R

J2

5

PO

WER

 SE

AT

 P

R

( D

R

IV

E

R

’

S SE

 RE

CL

IN

IN

G

 CO

P2

8

PO

W

E

R

S

E

N

SO

R

(DRI

V

E

 RE

A

R

 

R

O

L

)

P2

7

PO

W

E

R

S

E

N

SO

R

(DRI

V

E

 FR

O

N

T

T

R

O

L

)

P2

6

PO

W

E

R

S

E

N

SO

R

( DRI

V

E

CO

NT

R

O

L

)

P2

9

J

UNCT

IO

N

CO

N

N

E

C

T

O

R

B

J2

8

, J2

9

A

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

7

2

2

2

2

G–

W

G–

W

BR

PVCC

SSRR

SSRV

SSFV

SSRS

SGND

P

B16

B16

B16

BR

B

R

BR

BR

BR

O

S

IT

IO

N

 SEN

SO

AT

NT

R

O

L

)

 SEAT

 P

O

SI

T

IO

N

 

R

’

S SEAT

V

E

R

T

ICA

L

 CO

N

T

 SEAT

 P

O

SI

T

IO

N

 

R

’

S SEAT

 V

E

R

T

ICA

L

 CO

N

 SEAT

 P

O

SI

T

IO

N

 

R

’

S SEAT

 SL

ID

E 

1

3

1

3

1

3

1

3

P 

P

P

P

[
 

10A
GAUGE

1J

1

133

(DRIVER’S SEAT w/ DRIVING POSITION MEMORY)

A

1

A

2

A

5

A

6

A

9

A

10

A

3

A

4

B

5

B

6

B

7

M

1

2

M

1

2

M

1

2

M

2

1

SEAT POSITION CONTROL ECU

B

S14

, S15

A

SEAT MEMORY SW

P

O

WER

 SEAT

 M

O

T

O

R

(D

R

IVER

’

S

 SEAT

 SL

ID

E C

O

N

T

R

O

L

)

P2

1

P

O

WER

 SEAT

 M

O

T

O

R

(D

R

IVER

’

S

 SEAT

 F

R

O

N

T

 V

E

R

T

ICA

L

 CO

NT

RO

L

)

P1

7

P

O

WER

 SEAT

 M

O

T

O

R

(D

R

IVER

’

S

 SEAT

 R

EAR

 V

E

R

T

ICA

L

 CO

NT

RO

L

)

P1

9

P

O

WER

 SEAT

 M

O

T

O

R

(D

R

IVER

’

S

 SEAT

 RE

CL

IN

IN

G

 CO

NT

RO

L

)

P2

0

Y

V

P

L

L–

B

R–

L

L–

R

L–

Y

R

R–

G

R–

B

BR

BR

RCL–

RCL+

RRV–

RRV+

FRV–

FRV+

SLD–

SLD+

SW1

SW2

MMRY

A

BN

J37
JUNCTION
CONNECTOR

IF2

8

BS2

7

BS2

8

A

8

A

7

L–

W

L–

W

L–

W

W–

B

W–

B

1

GND

+B

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

B16

L–

W

M

2

1

B16

W–

B

W–

B

L

LG

L–

W

POWER SEAT MOTOR

(DRIVER’ S SEAT
 LUMBAR SUPPORT CONTROL)

P18

P14

W–B

S13

1

4

3

2

1

2

SE

T

1

2

MMRY

E

3

4

2

1

POWER SEAT CONTROL SW
(DRIVER’ S SEAT
 LUMBAR SUPPORT CONTROL)

FR

O

N

T

R

EAR

30A
POWER

1D

3

2

134

POWER SEAT

135

(DRIVER’S SEAT w/ DRIVING POSITION MEMORY)

CURRENT IS ALWAYS APPLIED FROM ECU–B FUSE TO TERMINAL SYSB OF THE SEAT POSITION CONTROL ECU, FROM
POWER FUSE TO TERMINAL +B OF THE SEAT POSITION CONTROL ECU, AND FROM STOP FUSE TO TERMINAL 2 OF THE STOP
LIGHT SW.
WITH THE IGNITION SW TURNED ON, CURRENT FLOWS FROM ECU–IG FUSE TO TERMINAL IG OF THE SEAT POSITION
CONTROL ECU AND FROM THE GAUGE FUSE TO TERMINAL 2 OF THE P POSITION SW.

POWER SEAT OPERATION (DRIVER’S SEAT)

CURRENT IS ALWAYS APPLIED TO TERMINAL SYSB AND TERMINAL +B OF THE SEAT POSITION CONTROL ECU SO THAT SEAT
POSITION CONTROL 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 SEAT POSITION CONTROL ECU, THE ECU OPERATES AND THE CURRENT TO TERMINAL +B OF THE
SEAT POSITION CONTROL ECU FLOWS FROM TERMINAL SLD+ OF THE SEAT POSITION CONTORL ECU 

 

TERMINAL 1 OF THE

POWER SEAT MOTOR (DRIVER’S SEAD SLIDE CONTROL) 

 

TERMINAL 2 

 

TERMINAL SLD– OF THE SEAT POSITION CONTROL

ECU  

 

TERMINAL GND 

 

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 SEAT POSITION CONTROL ECU. THIS CAUSES THE CURRENT FLOWING FROM
THE ECU TO THE MOTOR TO FLOW FROM TERMINAL SLD– OF THE SEAT POSITION CONTROL ECU 

 

TERMINAL 2 OF THE

POER SEAT MOTOR (DRIVER’S SEAT SLIDE CONTROL) 

 

TERMINAL 1 

 

TERMINAL SLD+ OF THE SEAT POSITION CONTROL

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 SEAT POSITION CONTROL ECU 

 

TERMINAL FRV+ 

 

TERMINAL 1 OF THE POWER SEAT MOTOR

(DRIVER’S SEAT FRONT VERTICAL CONTROL) 

 

TERMINAL 2 

 

TERMINAL FRV– OF THE ECU 

 

TERMINAL GND 

 

GROUND.

FRONT VERTICAL CONTROL ‘DOWN’  OPERATION

TERMINAL +B OF THE SEAT POSITION CONTROL ECU 

 

TERMINAL FRV– 

 

TERMINAL 2 OF THE POWER SEAT MOTOR

(DRIVER’S SEAT FRONT VERTICAL CONTROL) 

 

TERMINAL 1 

 

TERMINAL FRV+ OF THE ECU 

 

TERMINAL GND 

 

GROUND.

REAR VERTICAL CONTROL ‘UP’  OPERATION

TERMINAL +B OF THE SEAT POSITION CONTROL ECU 

 

TERMINAL RRV+ 

 

TERMINAL 1 OF THE POWER SEAT MOTOR

(DRIVER’S SEAT REAR VERTICAL CONTROL) 

 

TERMINAL 2 

 

TERMINAL RRV– OF THE ECU 

 

TERMINAL GND 

 

GROUND.

REAR VERTICAL CONTROL ‘DOWN’  OPERATION

TERMINAL +B OF THE SEAT POSITION CONTROL ECU 

 

TERMINAL RRV– 

 

TERMINAL 2 OF THE POWER SEAT MOTOR

(DRIVER’S SEAT REAR VERTICAL CONTROL) 

 

TERMINAL 1 

 

TERMINAL RRV+ OF THE ECU 

 

TERMINAL GND 

 

GROUND.

RECLINING CONTROL OF ‘FRONT’  OPERATION

TERMINAL +B OF THE SEAT POSITION CONTROL ECU 

 

TERMINAL RCL+ 

 

TERMINAL 2 OF THE POWER SEAT MOTOR

(DRIVER’S SEAT RECLINING CONTROL) 

 

TERMINAL 1 

 

TERMINAL RCL– OF THE ECU 

 

TERMINAL GND 

 

GROUND.

RECLINING CONTROL OF ‘REAR’  OPERATION

TERMINAL +B OF THE SEAT POSITION CONTROL ECU 

 

TERMINAL RCL– 

 

TERMINAL 1 OF THE POWER SEAT MOTOR

(DRIVER’S SEAT RECLINING CONTROL) 

 

TERMINAL 2 

 

TERMINAL RCL+ OF THE ECU 

 

TERMINAL GND 

 

GROUND.

THE NUMBER OF TURNS OF EACH MOTOR (AMOUNT OF MOVEMENT OF EACH PART OF THE SEAT) IS DETECTED BY THE
POSITION SENSORS AND INPUT TO THE ECU, MAKING IT POSSIBLE TO PERFORM MEMORY AND RETURN FUNCTIONS FOR
THE SEAT POSITION USING THE SEAT MEMORY SWITCH.

SYSTEM OUTLINE