Lexus ES300 (1997 year). Manual — part 419

The wireless door lock ECU automatically performs LOCK–UNLOCK once at a
1 sec. interval to inform the technician that it has received the signal from the
transmitter.

Press transmitter switch for at least 1 sec.

Close the driver’s door, then open it.

Again press the transmitter switch for at least 1 sec.

The wireless door lock ECU automatically performs LOCK–UNLOCK once or
twice at a 1 sec. interval to inform the technician that it has received the signal
from the transmitter.

LOCK–UNLOCK occurs once

LOCK–UNLOCK occurs twice

Registration of recognition code is completed

Registration of recognition code has not been completed.

Recognition code received first time and second time did not match.

When selecting add mode, a recognition code indicating registration

completed was already received.

To continue registration

If even one of the following condition s exists, registration of recognition codes
in completed.

20 secs. elapses since the wireless door lock ECU response.

The driver’s door is closed.

The key plate is inserted in the ignition key cylinder.

4 recognition codes are registration at one time.

Registration of recognition codes (add mode or rewrite mode) is completed.

Within
20 secs.

Within
3 secs.

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–453

605

1997 LEXUS ES300 (RM511U)

DI0DT–03

I00638

Ignition Switch and
Key Unlock Warning Switch

Wireless Door Lock ECU

Transmitter

Instrument Panel Junction Block and
Integration Relay

Door Courtesy Switch

Door Key Lock and Unlock Switch

Door Lock Assembly

Door Lock Motor

Door Unlock

Detection Switch

Door Courtesy Switch

Wireless Door Lock Volume

Door Lock Assembly

Door Lock Motor

Door Unlock

Detection Switch

Door Lock Assembly

Door Lock Motor

Door Unlock

Detection Switch

Door Key Lock and Unlock Switch

Wireless Door Lock Buzzer

DI–454

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

606

1997 LEXUS ES300 (RM511U)

PARTS LOCATION

DI0DU–01

I00227

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–455

607

1997 LEXUS ES300 (RM511U)

TERMINALS OF ECM

Symbols (Terminals No.)

Wiring Color

Condition

STD Voltage (V)

3 ( BZR2

BZR )

Buzzer does not sound.

Below 1 V

2 – 3 ( BZR2 – BZR )

Y – B

Buzzer sounds.

8 – 10 V

d ( TRLY

d )

Taillight does not light up.

Below 1 V

4 – Ground ( TRLY – Ground )

G – R

Taillight light up.

8 – 10 V

d ( T

d )

Luggage compartment door key operated switch ”ON”.

Below 1

Ω

5 – Ground ( T – Ground )

G – W

Luggage compartment door key operated switch ”OFF”.

Ω

or higher

d ( UL3

d )

Door key lock and unlock switch ”UNLOCK”.

(Driver’s Door)

Below 1.5 V

7 – Ground ( UL3 – Ground )

R – G

Door key lock and unlock switch ”LOCK”.

(Driver’s Door)

8 – 10 V

8 – Ground (+B – Ground )

Always.

10 – 14 V

d (KSW

d )

L B

Key unlock warning switch ”ON”.

(Ignition key is inserted into key cylinder)

Below 1 V

10 – Ground (KSW – Ground )

L– B

Key unlock warning switch ”OFF”.

(Ignition key pull out key cylinder)

10 – 14 V

d (LSWD

Door unlock detection switch ”ON”.

Below 1 V

11 – Ground (LSWD – Ground)

L – R

Door unlock detection switch ”OFF”.

10 – 14 V

d (IG

Turn the ignition switch ”OFF” or ”ACC”.

Below 1 V

13 – Ground (IG – Ground)

B – R

Turn the ignition switch ”ON”.

10 – 14 V

d (CTY

d )

Door courtesy switch ”ON”.

Below 1 V

14 – Ground (CTY – Ground )

R – W

Door courtesy switch ”OFF”.

10 – 14 V

d (L

d )

Door key lock and unlock switch ”LOCK”.

Below 1 V

15 – Ground (L – Ground )

L – W

Door key lock and unlock switch does not”OFF” or ”UNLOCK”.

8 – 10 V

DI0DV–01

DI–456

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

608

1997 LEXUS ES300 (RM511U)

PROBLEM SYMPTOMS TABLE

Perform troubleshooting of the circuit for the applicable problem symptom in the order given in the chart be-
low. Proceed to the page located for each circuit.
HINT:

Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system and theft deterrent system are operating normally. Accordingly, before troubleshooting
the wireless door lock control system, first make certain that the door lock control system and theft de-
terrent system are operating normally.

If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.

If the trouble still reappears even through there are no abnormalities in any of the other circuits, check
and replace the Wireless Door Lock ECU as the last step.

Symptom

Suspect Area

See page

All function of wireless door lock control system do no operate.

1. ECU Power Source Circuit.

2. Ignition Switch Circuit.

3. Door Courtesy Switch Circuit.

4. Door Key Lock and Unlock Switch Circuit.

(Unlock Side)

5. Door Key Lock and Unlock Switch Circuit.

(Lock Side)

6. Key Unlock Warning Switch Circuit.