Lexus ES300 (1997 year). Manual — part 424

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–473

625

1997 LEXUS ES300 (RM511U)

NG

Replace wireless door lock ECU.

OK

Check and repair harness and connector be-
tween ECU and volume, volume and buzzer,
buzzer and ECU.

N22143

Wireless Door Lock ECU

6

4

G–R

TRLY

W8

Integration Relay

B

C

C

4

Theft Deterrent ECU

Automatic Light Control Sensor

J35

B

J34

G–R

10

G–R

1D

1C

G–R

J2

C

C

C

Instrument Panel J/B

IG2

J/C

N22138

TRLY(+)

Door Lock
position

Lock

Signal

Unlock

Once
signal

0.2 sec.

0.2 sec.

0.25 sec.

Twice
signal

DI–474

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

626

1997 LEXUS ES300 (RM511U)

Taillight Relay Circuit

CIRCUIT DESCRIPTION

TRLY terminal outputs the signal once when pressing the LOCK switch of the transmitter and twice when
pressing the UNLOCK switch and then makes the taillight come to light.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

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

DI0EB–01

–

DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–475

627

1997 LEXUS ES300 (RM511U)

NG

Replace wireless door lock ECU.

OK

Check and repair harness and connector be-
tween wireless door lock ECU and taillight
relay circuit.

DI0EF–01

Customer Problem Analysis

Check and Clear DTC (Precheck)

Vehicle Brought to Workshop

Problem Symptom Confirmation

Symptom Simulation

Symptom does not occur

DTC Check

Normal code

DTC Chart

Problem Symptom Table

Circuit Inspection

Input Signal Check

Parts Inspection

Identification of Problem

Repair

Confirmation Test

End

Items inside

are titles of pages in this

manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations.

1

2

3

4

5

6

7

8

9

10

Step 2, 5, 8, 10: Diagnostic steps permitting the use

of the LEXUS hand–held tester or
LEXUS break–out–box.

P.

DI–477

P.

DI–478

P.

DI–478

P.

DI–483

P.

IN–17

P.

DI–487

P.

DI–488

OK

NG

mptom occur

Malfunction code

DI–476

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

628

1997 LEXUS ES300 (RM511U)

CRUISE CONTROL SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING