Lexus ES300 (1997 year). Manual - part 377

F00042

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

Open

Continuity

Continuity

Open

Continuity

(+)

(–)

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–285

437

1997 LEXUS ES300   (RM511U)

3

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

NG

Replace ABS & TRAC solenoid relay.

OK

4

Check for open and short in harness and connector between ABS & TRAC sole-
noid relay and ABS & TRAC ECU (See page 

IN–27

).

NG 

Repair or replace harness or connector.

OK

If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connector are normal, the ECU may be defective.

F00082

ALT

Engine Room R/B No. 3

2

ABS & TRAC 
Motor Relay

A7

ABS & TRAC Actuator

ABS

4

W–R

MT

R+

GR–L

14

24

MR

A19

1

3

F9

F6

B–G

FL 
Block

EB

MAIN

Battery

EA

1

B–G

3

3

3

1

2

3

A7

A7

1

2

3

W–B

W–B

W–B

A19

A19

GR–R

R–W

1

ABS & TRAC ECU

1

ALT

Engine Room R/B No. 3

2

ABS & TRAC 
Motor Relay

A7

ABS & TRAC Actuator

ABS

4

W–R

MT

R+

GR–L

14

24

MR

A19

1

3

F9

F6

B–G

FL 
Block

EB

MAIN

Battery

EA

1

B–G

3

3

3

1

2

3

A7

A7

1

2

3

W–B

W–B

W–B

A19

A19

GR–R

R–W

1

ABS & TRAC ECU

1

DI–286

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

438

1997 LEXUS ES300   (RM511U)

DTC

13, 14

ABS & TRAC Motor Relay Circuit

CIRCUIT DESCRIPTION

The ABS & TRAC motor relay supplies power to the ABS & TRAC pump motor. While the ABS is activated,
the ECU switches the ABS & TRAC motor relay ON and operates the ABS & TRAC pump motor.

DTC No.

DTC Detecting Condition

Trouble Area

13

Conditions (1) to (3) are detected:

(1) Malfunction of motor relay monitor.

(2) Battery voltage will not exceed more than 17.0 V 

      within 2.16 sec.

(3) Battery voltage will not become less than 9.5 V within

    2.16 sec., or after the motor relay is ON and motor 

     relay monitor does not ON.

ABS & TRAC motor relay

ABS & TRAC motor relay circuit

ECU

14

Motor relay is OFF, and motor relay monitor is ON 

continues for 20.16 sec. or more.

Fail safe function: If trouble occurs in the ABS & TRAC motor relay circuit, the ECU cuts off current to the
                             ABS & TRAC solenoid relay and prohibits ABS control and TRAC control.

WIRING DIAGRAM

DI0C3–01

F00049

1

2

3 4

(+)

(–)

Engine Room 
R/B No. 3

1

2

3 4

(+)

(–)

Engine Room 
R/B No. 3

1

2

3 4

(+)

(–)

Engine Room 
R/B No. 3

1

2

3 4

(+)

(–)

Engine Room 
R/B No. 3

F00056

ABS & TRAC
Motor
Relay

M

2

A19

MT

3

2

2

3

ABS & TRAC

Actuator

ECU

ABS & TRAC
Motor
Relay

M

2

A19

MT

3

2

2

3

ABS & TRAC

Actuator

ECU

ABS & TRAC
Motor
Relay

M

2

A19

MT

3

2

2

3

ABS & TRAC

Actuator

ECU

A7

ABS & TRAC
Motor
Relay

A7

M

2

A19

MT

3

2

2

3

ABS & TRAC

Actuator

ECU

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–287

439

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Check voltage between terminal 1 of Engine Room R/B No. 3 (for ABS & TRAC
motor relay) and body ground.

PREPARATION:
Remove ABS & TRAC motor relay from Engine Room R/B No.
3.
CHECK:
Measure voltage between terminal 1 of Engine Room R/B No.
3 (for ABS & TRAC motor relay) and body ground.
OK:

Voltage: 10 – 14 V

NG

Check and repair harness or connector.

OK

2

Check continuity between terminal 2 of ABS & TRAC motor relay and terminal
MT of ABS & TRAC ECU.

CHECK:
Check continuity between terminal 2 of ABS & TRAC motor
relay and terminal MT of ABS & TRAC ECU.
OK:

Continuity

HINT:There is a resistance of 33 

Ω

 between terminals A7 – 2

and A7 – 3 of ABS & TRAC actuator.

NG

Repair or replace harness or ABS & TRAC 
actuator.

OK

F00044

1

2

3

4

1

2

3

4

1

2

3

4

Continuity

Open

Continuity

(+)

(–)

DI–288

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

440

1997 LEXUS ES300   (RM511U)

3

Check ABS & TRAC motor relay.

PREPARATION:
Remove ABS & TRAC motor relay from Engine Room R/B No.
3.

CHECK:
Check continuity between each terminal of ABS & TRAC motor
relay.
OK:

Terminals 3 and 4

Continuity (Reference value 62 

Ω

)

Terminals 1 and 2

Open

CHECK:
(a)

Apply battery positive voltage between terminals 3 and 4.

(b)

Check continuity between terminals of ABS & TRAC mo-
tor relay.

OK:

Terminals 1 and 2

Continuity

NG

Replace ABS & TRAC motor relay.

OK

4

Check for open and short in harness and connector between ABS & TRAC motor
relay and ABS & TRAC ECU (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.