Lexus SC300 / Lexus SC400. Manual - part 1002

125

P 5

  POWER WINDOW MASTER AND DOOR LOCK CONTROL SW LH
4–GROUND: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
8–GROUND: ALWAYS CONTINUITY

10–GROUND: APPROX. 12 VOLTS WITH IGNITION SW ON AND MASTER SW (DRIVER’S WINDOW) AT UP POSITION

9–GROUND: APPROX. 12 VOLTS WITH IGNITION SW ON AND MASTER SW (DRIVER’S WINDOW) AT DOWN OR AUTO DOWN
POSITION

WINDOW LOCK SW

OPEN WITH WINDOW LOCK SW AT LOCK POSITION

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

D10

29

P 5

29

T 8

B

29

D11

29

P 6

29

T 9

A

29

P 4

29

P 7

29

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCKS (RELAY BLOCK LOCATION)

2

19

ENGINE COMPARTMENT LEFT

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1B

20

ENGINE ROOM MAIN WIRE

1D

20

FRONT DOOR LH WIRE

1H

1I

20

COWL WIRE

1J

20

COWL WIRE

1K

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IF2

36

FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)

IP1

38

FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

IF

36

LEFT KICK PANEL

IJ

36

RIGHT KICK PANEL

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

B 4

40

FRONT DOOR LH WIRE

SERVICE HINTS

186

PPS (PROGRESSIVE POWER STEERING)

1H

12

1E

12

1I

9

IJ1

10

IK1

7

IK1

6

IG2

7

IJ2

6

IJ2

16

1

2

10A
GAUGE

15A
ECU–IG

COMBINATION METER

SPEED
SENSOR
NO. 1

PPS SOLENOID

PPS ECU

3

2

1

5

4

2

3

1

OUT

VCC

GND

Y

SPD

E

SOL+

SOL–

+B

B–

R

Y

Y

PP

W–

B

LG

–B

LG

–

R

LG

–

B

LG

–R

W–

B

R

R

L–

R

Y

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

S 3

P 1

P 2

C14

BR

13

15

10

1

14

3D

13

3A

4

Y

IH

IJ

B

2

A

2

SHORT
CONNECTOR

L–

R

L–

R

S22

, S 23

B

A

1

10

15

14

13

1

2

1 2 3 4 5

1

2

3

GRAY

GRAY

C14

P 1

P 2

S 3

X

2

2

B

A

S22

S23

187

THE PPS (HYDRAULIC REACTION TYPE) CONTROLS THE HYDRAULIC PRESSURE APPLIED TO THE HYDRAULIC REACTION
CHAMBER IN THE GEAR BOX CONTROL UNIT USING THE PPS ECU, TO CHANGE THE STEERING FORCE AND PROVIDE OPTIMUM
STEERING FEELING AT ANY VEHICLE SPEED AND UNDER ANY STEERING CONDITIONS.

(PPS OPERATION)

WHEN THE IGNITION SW IS TURNED ON THE STARTING CURRENT FLOWS FROM THE ECU–IG FUSE TO TERMINAL 4 OF THE PPS
ECU. THE SPEED SENSOR MONITORS THE VEHICLE SPEED AND TRANSMITS CONTROL SIGNALS TO TERMINAL 3 OF THE ECU.
WHEN THE VEHICLE SPEED IS LOW, THE PPS ECU SENDS A HIGHER–VOLTAGE FROM TERMINAL 1 OF THE ECU 

→

 TERMINAL 1 OF

THE SOLENOID VALVE 

→

 TERMINAL 2 

→

 TERMINAL 5 OF THE ECU 

→

 TERMINAL 2 

→

 GROUND, INCREASING THE SOLENOID VALVE

OPENING ANGLE TO PROVIDE COMFORTABLE STEERING OPERATION. WHEN THE VEHICLE SPEED IS HIGH, THE PPS ECU
DECREASES THE SOLENOID VALVE OPENING ANGLE BY REDUCING THE VOLTAGE TO THE VALVE TO PROVIDE RESPONSIVE
STEERING FEELING.

P 1

  PPS SOLENOID

1–2 : APPROX. 7.7

 (25

°

C, 77

°

F)

P 2

  PPS ECU

4–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
2–GROUND : ALWAYS CONTINUITY
1–5 :

APPROX. 0.8A WITH VEHICLE SPEED BELOW 20 KM/H (12 MPH)
APPROX. 0.45A WITH VEHICLE SPEED AT 80 KM/H (48 MPH)
APPROX. 0.2A WITH VEHICLE SPEED ABOVE 160 KM/H (96 MPH)

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

C14

28

P 2

29

S22

B

29

P 1

27

S 3

27

S23

A

29

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1E

20

INSTRUMENT PANEL WIRE

1H

20

COWL WIRE

1I

20

COWL WIRE

3A

22

INSTRUMENT PANEL WIRE

3D

22

INSTRUMENT PANEL WIRE

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IG2

36

INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)

IJ1

36

ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)

IJ2

36

ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)

IK1

36

ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

IH

36

UNDER THE ASHTRAY LH

IJ

36

RIGHT KICK PANEL

SYSTEM OUTLINE

SERVICE HINTS

162

POWER SEAT (w/o DRIVING POSITION MEMORY)

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

30A
DOOR

1C

8

Ba2

4

BK

Ba2

5

POWER SEAT CONTROL SW
(FOR DRIVER’ S SEAT)

R

EAR

FR

O

N

T

HO

L

D

RE

L

E

A

S

E

1

2

12

7

UP

DO

W

N

FR

O

N

T

R

EAR

UP

DO

W

N

5

6

4

3

9

8

10

11

P 8

M

1

2

M

2

1

M

2

1

M

2

1

M

2

1

G–

R

G

L

L–

B

L–

Y

L–

R

Y–

R

Y–

B

Y–

G

Y–

L

L–

W

L–

W

W–

B

W–

B

POWER SEAT MOTOR
(FOR DRIVER’ S SEAT

SLIDE CONTROL)

POWER SEAT MOTOR
(FOR DRIVER’ S SEAT

FRONT VERTICAL
CONTROL)

POWER SEAT MOTOR
(FOR DRIVER’ S SEAT

RECLINING MOTOR
CONTROL)

POWER SEAT MOTOR
(FOR DRIVER’ S SEAT

REAR VERTICAL
CONTROL)

POWER SEAT MOTOR
(FOR DRIVER’ S SEAT

LUMBAR SUPPORT
CONTROL)

P17

P13

P16

P15

P14

SLIDE

FRONT VERTICAL

RECLINING

REAR VERTICAL

LUMBAR SUPPORT