Lexus ES300 (1997 year). Service manual — part 383

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–309

461

1997 LEXUS ES300 (RM511U)

4

Check battery positive voltage.

PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:

10 – 14 V

NG

Check and repair the charging system.

OK

5

Check ABS warning light.

PREPARATION:
(a)

Turn the ignition switch OFF.

(b)

Disconnect the connector from the ABS & TRAC ECU.

(c)

Turn the ignition switch ON.

CHECK:
Check the ABS warning light goes off.

OK

Check and replace ABS & TRAC ECU.

NG

Check for short in harness and connector between ABS warning light, DLC1, DLC2, and ABS &
TRAC ECU (See page

IN–27

).

F00092

Battery

ABS & TRAC
Solenoid Relay

Engine Room R/B No. 3

3

ABS & TRAC
ECU

A7

1

R–L

C

5

4

IJ1

IM2

6

J/C

C10

W–B

EB

EA

7

ABS Warning Light

8

12

IK3

G–B

23

2

22

ABS & TRAC
Actuator

DLC1

Short
Pin

WA

J30

3

3

3

3

3

W–B

W–B

4

ABS & TRAC
ECU

R–L

4

R–L

IK3

5

G–B

C

C

G–B

G–B

C10

3

ABS & TRAC ECU

R–L

R–L

J/C

D

1D

GAUGE

Instrument Panel J/B

A20

J4

D

G–B

4

W–L

2

DI–310

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

462

1997 LEXUS ES300 (RM511U)

ABS Warning Light Circuit

CIRCUIT DESCRIPTION

If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
Connect terminals Tc and E

1

of the DLC1 or DLC2 make the ABS warning light blink and output the DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

Troubleshooting in accordance with the chart below for each trouble symptom.

ABS warning light does not light up

Go to step 1

ABS warning light remains on

Go to step 3

1

Check ABS warning light.

See Combination Meter Troubleshooting on page

BE–58

.

NG

Repair bulb or combination meter assembly.

OK

DI0CI–01

F00043

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

6 5

Open

Continuity

Continuity

Open

Continuity

(+)

(–)

(+)

(–)

1

2

3

4

5

6

Continuity

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–311

463

1997 LEXUS ES300 (RM511U)

2

Check ABS & TRAC solenoid relay.

PREPARATION:
Remove ABS & TRAC solenoid relay from Engine Room R/B
No. 3.
CHECK:
Check continuity between each terminal of ABS & TRAC sole-
noid relay.
OK:

Terminals 4 and 6

Continuity (Reference value 80

Ω

)

Terminals 2 and 3

Continuity

Terminals 1 and 3

Open

CHECK:
(a)

Apply battery positive voltage between terminals 4 and 6.

(b)

Check continuity between each terminal of ABS & TRAC
solenoid relay.

OK:

Terminals 2 and 3

Open

Terminals 1 and 3

Continuity

CHECK:
Connect the

test lead to terminal 5 and the

lead to terminal

3. Check continuity between the terminals.
OK:

Continuity
If there is no continuity, connect the

test lead to terminal

5 and the

lead to terminal 3. Recheck continuity be-

tween terminals.

NG

Replace ABS & TRAC solenoid relay.

OK

Check for open in harness and connector between DLC1, ABS & TRAC solenoid relay and body
ground (See page

IN–27

).

DI–312

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

464

1997 LEXUS ES300 (RM511U)

3

Is DTC output?

Check DTC on page

DI–273

.

YES

Repair circuit indicated by the code output.

NO

4

Does ABS warning light go off?

NO

Check for short in harness and connector be-
tween ABS warning light, DLC1 and ABS &
TRAC ECU (See page

IN–27

).

YES

5

Check ABS & TRAC solenoid relay (See step 2).

NG

Replace ABS & TRAC solenoid relay.

OK

Check for short in harness and connector between DLC1 and ABS & TRAC solenoid relay
(See page

IN–27

).