Lexus ES300 (1997 year). Manual - part 358

W03890

ABS ECU or ABS & TRAC ECU

Absorber Control ECU

GR–R

FRO

w/ ABS

1

FRO

RRO

RRO

GR–R

GR–L

GR–L

w/ ABS

w/ ABS & TRAC

w/ ABS & TRAC

6

6

6

15

19

18

20

A23

A19

IM3

A23

A24

A19

A24

IM3

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–209

361

1997 LEXUS ES300   (RM511U)

DTC

34, 35

Speed Sensor Circuit

CIRCUIT DESCRIPTION

DTC No.*

DTC Detecting Condition

Trouble Area

34

35

Vehicle speed is 12 mph (20 km/h) or higher signal is not

input.

Right front and right rear speed sensor

Open or short circuit in between absorber control ECU and

ABS ECU or ABS & TRAC ECU

Open or short circuit in between ABS ECU or ABS & TRAC

ECU and ABS speed sensor

Error in other system that uses the same speed sensor

signal

ABS ECU or ABS & TRAC ECU

Absorber control ECU

*: Code 34 corresponds to right front speed sensor circuit.
   Code 35 corresponds to right rear speed sensor circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When DTC ”34” is displayed, check the right front speed sensor circuit.

When DTC ”35” is displayed, check the right rear speed sensor circuit.

DI0AK–01

W03880

AB0119

F00253

RRO

ON

FRO

(+)

(–)

DI–210

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

362

1997 LEXUS ES300   (RM511U)

1

Check voltage between terminals RRO and FRO of absorber control ECU con-
nector and body ground.

PREPARATION:
(a)

Remove the No.1 lower panel (See page 

BO–82

).

(b)

Start the engine.

CHECK:
Measure voltage between terminals RRO and FRO of absorber
control ECU connector and body ground while driving.
OK:
Voltage: 1.5 – 8 V 

OK

Proceed to next circuit inspection shown on
problem symptoms table (See page 

DI–203

).

NG

2

Check speed sensor (See page 

DI–232

 or 

DI–273

).

NG

Repair or replace harness, connector, speed
sensor or rotor.

OK

3

Check harness and connectors between absorber control ECU and ABS ECU or
ABS & TRAC ECU (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace absorber control ECU,
ABS ECU or ABS & TRAC ECU.

W03891

Steering Sensor

B–R

J15

Absorber Control ECU

SS1

Instrument Panel J/B

J8

Battery

A

Junction
Connector

SS2

J9

1J

1J

Junction
Connector

R–G

R

W–B

W–B

W–B

W–B

A24

A24

A

A

A

II

8

7

1

7

8

2

17

16

W03873

AB0119

F00252

(–)

SS1

SS2

(+)

ON

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–211

363

1997 LEXUS ES300   (RM511U)

DTC

36

Steering Sensor Circuit

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

36

Steering angle is 36

°

 or larger signal is not input.

Battery

Steering sensor

Open or short circuit in between absorber control ECU and

steering sensor

Absorber control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check voltage between terminals SS1 and SS2 of absorber control ECU connec-
tor and body ground.

PREPARATION:
(a)

Remove the No.1 lower panel (See page 

BO–82

).

(b)

Turn the ignition switch ON.

CHECK:
Measure voltage between terminals SS1 and SS2 of absorber
control ECU connector and body ground when steering wheel
is turned slowly.
OK:
Changes between 1 V and approx. 3.5 V

OK

Proceed to next circuit inspection shown on
problem symptoms table (See page 

DI–203

).

DI0AL–01

W00346

AB0119

F00254

1

2

ON

W00347

2

1

7

8

2

DI–212

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

364

1997 LEXUS ES300   (RM511U)

NG

2

Check voltage between terminals 1 and 2 of steering sensor connector.

PREPARATION:
(a)

Remove the steering wheel lower No.2 and No.3 covers,
steering wheel pad, steering wheel column upper and
lower covers (See page 

SR–11

).

(b)

Disconnect the steering sensor connector.

(c)

Turn the ignition switch ON.

CHECK:
Measure voltage between terminals 1 and 2 of steering sensor
connector.
OK:
Voltage: 10 – 14 V

NG

Check and repair harness and connectors be-
tween battery and steering sensor.

OK

3

Check steering sensor.

PREPARATION:
Apply battery positive voltage between terminals 1 and 2.
CHECK:
Measure the resistance between the terminal 2 and terminals
7 and 8 of steering sensor connector when the rotating part of
steering sensor is turned slowly.
OK:
Changes between 0 

Ω

 and 

∞

 

Ω

NG

Replace steering sensor.

OK

4

Check harness and connectors between absorber control ECU and steering sen-
sor (See page 

IN–27

).