Lexus ES300 (2002 year). Service manual - part 287

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DIAGNOSTICS

ABS WITH EBD SYSTEM

05-277

430

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)

CIRCUIT DESCRIPTION

Refer to ABS Warning Light Circuit (Remains ON) on page 

05-275

.

WIRING DIAGRAM

Refer to ABS Warning Light Circuit (Remains ON) on page 

05-275

.

INSPECTION PROCEDURE

1

PERFORM ACTIVE TEST BY HAND-HELD TESTER(ABS WARNING LIGHT
OPERATION)

(a)

Select the item ”ABS WARN LIGHT” in the ACTIVE TEST and operate the ABS warning light on the
hand-held tester.

(b)

Check that ”ON” and ”OFF” operation of the ABS warning light can be done on the combination meter
by the hand-held tester.

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

2

INSPECT COMBINATION METER ASSY(ABS WARNING LIGHY CIRCUIT)

NG

REPAIR COMBINATION METER ASSY

OK

CHECK AND REPAIR HARNESS AND CONNECTOR

055XW-02

F41981

F43001

FL MAIN

R-W

Battery

W

1

Combination Meter

Skid Control ECU

Driver Side J/B

2

C7

C8

ALT

LBLO

Brake

B-Y

Passenger Side J/B

3

I14 
Ignition SW

S7

8

S7

21

PKB

17

2R

5

2P

7

2M

8

2G

11

B-G

2A

1

87

2

2E

3A

4

IG1 Relay

8

IA

IG1 AM1

W-B

1

Engine Room R/B

B-G

1

40

W

R-Y

R-W

P5
Parking
Brake SW

GAUGE1

AM1

2

1

2A

2

2

W

W

W

3A

57

1

R-Y

IF7

13

05-278

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DIAGNOSTICS

ABS WITH EBD SYSTEM

431

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

BRAKE WARNING LIGHT CIRCUIT

CIRCUIT DESCRIPTION

The brake warning light lights up when the brake fluid is insufficient, the EBD is abnormal, or the parking
brake is applied.

WIRING DIAGRAM

055XX-02

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DIAGNOSTICS

ABS WITH EBD SYSTEM

05-279

432

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

CHECK PARKING BRAKE SWITCH CIRCUIT

NG

REPAIR OR REPLACE PARKING BRAKE
SWITCH CIRCUIT

OK

2

CHECK BRAKE FLUID LEVEL WARNING SWITCH CIRCUIT

NG

REPAIR OR REPLACE BRAKE FLUID LEVEL
WARNING SWITCH CIRCUIT

OK

3

RECONFIRM DTC(See page 

05-239

)

A

Normal Code

B

Malfunction Code

B

REPAIR CIRCUIT INDICATED BY OUTPUT
CODE

A

4

INSPECT COMBINATION METER ASSY(BRAKE WARNING LIGHT CIRCUIT)

NG

REPAIR OR REPLACE COMBINATION METER
ASSY

OK

5

CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU - COMBINATION
METER)(See page 

01-31

)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY

055XG-02

ABS Check Sheet

Inspector’s

Name

:

Customer’s Name

Date Vehicle
Brought In

Registration Year

Registration No.

Frame No.

Odometer Reading

/              /

/              /

Date Problem First Occurred

Frequency the Problem Occurs

/                            /

Continuously

Intermittently (       times a day)

ABS does not operate.

ABS does not operate efficiently.

ABS Warning Light
Abnormal

Remains ON

Does not Light Up

DTC Check

1st Time

2nd Time

Normal Code

Malfunction Code (Code         )

Normal Code

Malfunction Code (Code         )

Symptoms

km

miles

Brake Warning
Light Abnormal

Remains ON

Does not Light Up

STOP LIGHT SW

SYSTEM

Freeze Frame Data

#IG ON

VEHICLE SPD

ON

OFF

NO SYS

ABS

BA

FAIL SF

km/h

MPH

05-238

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DIAGNOSTICS

ABS WITH EBD SYSTEM

391

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

CUSTOMER PROBLEM ANALYSIS CHECK