Lexus ES300 (1997 year). Manual - part 422

N21271

Theft Deterrent ECU

L–W

Instrument Panel J/B

J33

Wireless Door Lock ECU

L–W

L–W

L

B

B

B

B

15

18

W8

I14

L–W

Door Key
Lock and
Unlock
Switch

UNLOCK

J36

LOCK

1G

1V

J38

IO2

IE1

W–B

W–B

W–B

W–B

W–B

RH

IE2

UNLOCK

LOCK

B

B

B

B

1

1

3

3

2

2

20

20

4

L–W

IO2

4

L–W

W–B

L–W

LH

W–B

Integration Relay

7

3

IF

IL

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–465

617

1997 LEXUS ES300   (RM511U)

 Door Key Lock and Unlock Switch Circuit (Lock Side)

CIRCUIT DESCRIPTION

Refer to page 

DI–463

.

Tr inside the wireless door lock ECU coming ON causes the theft deterrent ECU to output a signal to
lock all the doors.

WIRING DIAGRAM

DI0E5–01

N14693

L(+)

DI–466

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

618

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Check voltage between terminal L of wireless door lock ECU connector and
body ground.

PREPARATION:
Remove the wireless door lock ECU from No.1 instrument pan-
el brace.
CHECK:
Measure voltage between terminal L of wireless door lock ECU
connector and body ground.
OK:

Voltage 10 – 14 V

OK

Proceed to next circuit inspection shown on
matrix chart (See page 

DI–456

).

NG

Check and repair harness and connector between wireless door lock ECU and door key lock and
unlock switch.

N21268

Wireless Door Lock ECU

Key Unlock
Warning Switch

KSW

L–B

W–B

1M

1J

7

1

2

3

7

10

1D

J/C

W–B

Instrument
Panel J/B

W8

J11

Instrument Panel J/B

L–B

B

J10

B

J15

5

1M

L–B

IG

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–467

619

1997 LEXUS ES300   (RM511U)

 Key Unlock Warning Switch Circuit

CIRCUIT DESCRIPTION

When the key is inserted in the ignition key cylinder, the key unlock warning switch comes ON, and when
the key is not inserted the switch is OFF.
When the key unlock warning switch is ON, the ECU operates the transmitter misoperation prevention func-
tion.

WIRING DIAGRAM

DI0E7–01

N14694

KSW(+)

DI–468

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

620

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Check voltage between terminal KSW of wireless door lock ECU connector and
body ground.

PREPARATION:
Remove the wireless door lock ECU from No.1 instrument pan-
el brace.
CHECK:
Measure voltage between terminal KSW of wireless door lock
ECU connector and body ground, when key plate is not inserted
in the key cylinder.
OK:

Voltage: 10 – 14 V

OK

Proceed to next circuit inspection shown on
matrix chart (See page 

DI–456

).

NG

Check and repair harness and connector between wireless door lock ECU and key unlock warn-
ing switch.