Lexus ES300 (1997 year). Manual - part 423

N21270

Wireless Door Lock ECU

Theft Deterrent ECU

Integration Relay

Door
Courtesy
Switch
Rear RH

R–B

IP1

1S

J35

D

4

9

1G

R–W

CTY

14

1

2

7

12

1

1

1

1

J34

J34

E

D

R–W

W8

Door
Courtesy
Switch
Front LH

Door
Courtesy
Switch
Rear LH

Door
Courtesy
Switch
Front RH

R–W

J34 D

I14

6

1S

R–W

R–G

R–G

J34

J34

J35

D

E

E

J34

E

DIODE

IP1

7

R–G

R–G

Instrument Panel J/B

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–469

621

1997 LEXUS ES300   (RM511U)

 Door Courtesy Switch Circuit

CIRCUIT DESCRIPTION

The door courtesy switch comes ON when the door is opened and goes OFF when door is closed.
Furthermore. the door courtesy switch circuit has terminal +B connected  inside the theft deterrent ECU
.  Battery positive voltage is applied to terminal DSWD of the theft deterrent ECU when all doors are
closed, i.e., when the door courtesy switch of all doors are OFF.

WIRING DIAGRAM

DI0E9–01

N14695

CTY(+)

DI–470

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

622

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Check operation of open door warning light.

CHECK:
Check that open door warning light comes on when each door is opened, and goes off when all doors are
closed.

NG

Check open door warning light circuit

OK

2

Check voltage between terminal CTY 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 CTY of wireless door lock
ECU connector and body ground, when all doors are closed.
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 courtesy
switch.

N21269

Wireless Door Lock ECU

2

3

Y–G

BZR

BZR2

W8

W8

Wireless Door Lock
Buzzer Volume

Wireless Door
Lock Buzzer

2

3

LG

IJ1

8

LG

13

2

G

IJ1

2

G

9

G

1

LG

IM3

IM3

N14880

1

2

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–471

623

1997 LEXUS ES300   (RM511U)

 Wireless Door Lock Buzzer Circuit

CIRCUIT DESCRIPTION

The volume of the buzzer can be controlled or turned off by the volume switch.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check wireless door lock buzzer.

PREPARATION:
Remove wireless door lock buzzer.
CHECK:
Measure resistance between terminals.
OK:

Approx. : 1 k

Ω

NG

Replace wireless door lock volume.

OK

DI0EA–01

N09960
N14881

I00641

Min.
(OFF)

30

°

Max.

2(–)

1(+)

30

°

N22171

BZR(+)

Door Lock
position

Lock

Signal

Unlock

Once
signal

0.13 sec.

0.13 sec.

0.25 sec.

Twice
signal

DI–472

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

624

1997 LEXUS ES300   (RM511U)

2

Check wireless door lock volume.

PREPARATION:
Remove wireless door lock volume.
CHECK:
Measure resistance between terminals.
OK:

OFF position: 

∞ Ω

Min. position: 10 k

Ω

Max. position: 0 

NG

Replace wireless door lock volume.

OK

3

Check voltage between terminal BZR 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 signal between terminal BZR and body ground, when
transmitter is ON and OFF.
OK: