Lexus ES300 (2002 year). Service manual - part 314

F41992

Skid Control ECU

Combination Meter

6

IND

S7

Engine Room J/B

Driver Side J/B

From
Ignition SW

LG

B-R

IG2

8

5

2O

8

2G

1C

C8

20

7

1C

C7

39

W

B-O

Slip

IF6

8

B-R

05-374

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

527

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

SLIP INDICATOR LIGHT CIRCUIT

CIRCUIT DESCRIPTION

The SLIP indicator blinks during TRAC & VSC operation.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.

1

PERFORM ACTIVE TEST BY HAND-HELD TESTER(SLIP INDICATOR LIGHT
OPERATION)

(a)

Select the item ”SLIP INDI LIGHT” in the ACTIVE TEST and operate the SLIP indicator light on the
hand-held tester.

(b)

Check that ”ON” and ”OFF” of the SLIP indicator light can be shown on the combination meter by the
hand-held  tester.

OK

Go to step 4

NG

2

CHECK SLIP INDICATOR LIGHT

(a)

Check that the SLIP indicator light is on for 3 seconds soon after ignition switch ON.

OK

END

NG

052A1-03

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-375

528

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

3

INSPECT COMBINATION METER ASSY(SLIP INDICATOR LIGHT CIRCUIT)

NG

REPAIR OR REPLACE COMBINATION METER
ASSY

OK

4

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

01-31

)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE SKID CONTROL ECU ASSY

F41993

Skid Control ECU

Combination Meter

4

WT

S7

Passenger Side J/B

Engine Room J/B

B-R

Driver Side J/B

TRAC OFF SW

L

W-B

IG2

70

7

8

IA

2L

SB

39

C7

3B

3B

30

4

1C

C8

14

7

CSW

S6

8

1C

LG

W-B

IF6

B-O

8

2G

2O

5

1

8

2R

VSC

OFF

From
Ignition SW

B-R

8

05-376

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

529

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT

CIRCUIT DESCRIPTION

This is the TRAC control main switch. When the TRAC cut switch is pushed on, TRAC control goes off and
the TRAC OFF indicator lights up. This indicator blinks for warnings when the trouble occurs and for display-
ing DTC. Turn the ignition switch OFF, TRAC control surely comes on when the ignition switch turns ON next
time.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

RECONFIRM DTC(See page 

05-288

)

A

Normal Code

B

Malfunction Code

B

REPAIR CIRCUIT INDICATED BY OUTPUT
CODE

A

055W7-02

F00052

1

4

(+)

(-)

3 2

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-377

530

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

2

INSPECT TRACTION CONTROL SWITCH

(a)

Remove TRAC control switch.

(b)

Disconnect TRAC control switch connector.

(c)

Measure resistance between terminals 1 and 4 of TRAC
control switch when TRAC control switch is on and off.
OK:

TRAC cut switch

Resistance

Pushed in

Continuity

NG

REPLACE TRACTION CONTROL SWITCH

OK

3

CHECK HARNESS AND CONNECTOR(TRACTION CONTROL SWITCH - BODY
GROUND)(See page 

01-31

)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

4

INSPECT COMBINATION METER ASSY(TRAC OFF INDICATOR LIGHY CIRCUIT)

NG

REPAIR OR REPLACE COMBINATION METER
ASSY

OK

5

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

01-31

)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE SKID CONTROL ECU ASSY