Lexus ES300 (1997 year). Service manual — part 371

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

DI–261

413

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 ECU.

(c)

Turn the ignition switch ON.

CHECK:
Check the ABS warning light goes off.

OK

Check and replace ABS ECU.

NG

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

IN–27

).

F00091

Engine Room R/B No. 3

ABS Solenoid Relay

3

EB

ABS
Actuator

A6

1

2

5

Battery

GAUGE

Instrument Panel J/B

J/C

J4

A

ABS ECU

3

3

3

3

EA

3

4

6

ABS ECU

A

IM2

8

R–L

IK3

4

DLC1

R–L

IK3

5

Short
Pin

W–B

W–B

W–B

ABS ECU

W–L

G–B

C

C

C

R–L

R–L

1D

2

3

7

G–B

A22 WA

IJ1

12

4

G–B

4

G–B

C10

C10

J/C

J30

ABS Warning
Light

G–B

23

22

R–L

DI–262

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

414

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.
After removing the short pin of the DLC1, 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

DI0BR–01

F00043

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

6

5

Open

Continuity

Continuity

Continuity

Open

(+)

(–)

(+)

(–)

1

2

3

4

5

6

Continuity

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

DI–263

415

1997 LEXUS ES300 (RM511U)

2

Check ABS solenoid relay.

PREPARATION:
Remove ABS solenoid relay from Engine Room R/B No. 3.
CHECK:
Check continuity between each terminal of ABS solenoid 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 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 solenoid relay.

OK

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

IN–27

).

DI–264

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

416

1997 LEXUS ES300 (RM511U)

3

Is DTC output?

Check DTC on page

DI–232

.

YES

Repair circuit indicated by the code output.

NO

4

Does ABS warning light go off if short pin is removed?

NO

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

IN–27

).

YES

5

Check ABS solenoid relay (See step 2).

NG

Replace ABS solenoid relay.

OK

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

IN–27

).