Lexus ES300 (1997 year). Service manual — part 648

186

ELECTRONIC MODULATED SUSPENSION

ELECTRIC MODULATED SUSPENSION SYSTEM IS THE DAMPING FORCE CONTROL SYSTEM USING SEVERAL SIGNALS WHICH
RESTRAINS THE VEHICLE MOVEMENT (SUCH AS ROLLING, DRIVING, AND SQUAD) BY A DRIVER’S OPERATION TOGETHER WITH
RESTRAINING AND ABSORBING THE VEHICLE MOVEMENT CHANGE AND VIBRATION AGAINST THE UNEVENNESS OF THE ROAD.

(1) STEERING SENSOR SIGNAL

TO INPUT THE ROTATION ANGLE OF THE STEERING WHEEL INTO THE TERMINALS SS1 AND SS2 OF THE ABSORBER CONTROL
ECU.

(2) SPEED SENSOR SIGNAL

TO DETECT THE VEHICLE SPEED AT ABS SPEED SENSOR FRONT LH, RH, REAR LH, RH AND INPUT TO THE TERMINALS FRO AND
RRO OF THE ABSORBER CONTROL ECU FROM ABS ECU OR ABS AND TRACTION ECU.

(3) STOP LIGHT SW SIGNAL

TO DETECT THE SIGNAL OF THE BRAKE IN OPERATION AND INPUT IT INTO THE TERMINAL STP OF THE ABSORBER CONTROL
ECU.

(4) ENGINE ROTATION SIGNAL

TO DETECT THE ENGINE SPEED AND INPUT IT INTO THE TERMINAL NEO OF THE ABSORBER CONTROL ECU.

(5) ABSORBER CONTROL SW SIGNAL

TO DETECT THE SWITCH CONDITION AND INPUT IT INTO THE TERMINALS SW1 AND SW2 OF THE ABSORBER CONTROL ECU.

A24 ABSORBER CONTROL ECU

2–GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION

26–GROUND : APPROX. 12 VOLTS WITH THE BRAKE PEDAL DEPRESSED

1–GROUND : ALWAYS CONTINUITY

S 6 STEERING SENSOR

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

: PARTS LOCATION

CODE

SEE PAGE

CODE

See Page

Code

See Page

A11

26

D 1

26

J24

29

A12

26

D 3

28

J27

29

A19

28

E27

28

J28

A

29

A23

28

J 1

29

J29

B

29

A24

28

J 3

29

J37

30

A25

28

J 8

A

29

S 6

29

A35

30

J 9

B

29

S10

29

A36

30

J15

29

,,,

,,,

,,,

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code

See Page

Junction Block and Wire Harness (Connector Location)

1C

1J

24

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

1R

24

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

ID1

36

FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)

IK3

38

ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)

IM3

38

ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)

IN1

38

FLOOR NO. 2 WIRE AND COWL WIRE (RIGHT KICK PANEL)

: GROUND POINTS

Code

See Page

GROUND POINTS LOCATION

EA

34

RIGHT RADIATOR SIDE SUPPORT

ED

34

SURGE TANK RH

II

36

INSTRUMENT PANEL BRACE LH

IM

36

RIGHT KICK PANEL

BN

40

UNDER THE LEFT CENTER PILLAR

BO

40

UNDER THE RIGHT CENTER PILLAR

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

B 6

40

FLOOR NO. 2 WIRE

SYSTEM OUTLINE

SERVICE HINTS

187

1 2 3

4 5

1 2 3

4 5

X X

6 X X

X

19 X X

6

15

X

1 2 X 4

X X

X

X

X

X

X

X X

X

16 X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

15

X

A A A A A
C C C

E E E F F F F

A A A A A A

A A A A A A

A

A

A

A

A

A

A11 GRAY

A12 GRAY

A19

A23

A24 GRAY

A25 BLACK

D 1 BLACK

D 3 DARK GRAY

J 3

J15

A GRAY

J 8

B GRAY

J 9

5

1 2 3 4

6 7 8

X 10 11 12 13

14 X 16 17 18 19 20 21 22

X X X 26

1

2

3

4

5

1

2

3

4

5

A36 GRAY

A35 GRAY

B B

B B

A A

A A

A A A A A A A

J 1 GRAY

J24

3

11

4

C C C

B B B

X X

X

13

X

E 7

3

B B B

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

188

ELECTRIC MODULATED SUSPENSION

A A A A A

B B B B

C C C D D D E E E F F F F

A

A

A

A

A

A

1 2 X X X

X 7 8 X X

1

2

J27

J37

S 6

S10 BLUE

X X F F

D D X X

A

J28

B

J29

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

GRAY

189

MEMO