Lexus ES300 (1997 year). Service manual — part 416

DI0DQ–01

Vehicle Brought to Workshop

Customer Problem Analysis

Circuit Inspection

Symptom Simulation

Identification of Problem

Confirmation Test

END

1

2

3

4

8

Repair

5

7

DI–442

IN–17

DI–456

Problem Symptom Confirmation

Precheck

Transmitter Inspection

Problem Symptoms Table

Titles inside are titles of pages in
this manual, with the page number indicated
in the bottom position. See the indicated
pages for detailed explanations.

Some functions of wireless door lock
control system do not operate

Whole wireless
door lock control
system does not
operate

DI–443

DI–443

DI–474

9

System is Normal

Malfunction on
vehicle side

6

Transmitter Malfunction

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DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–441

593

1997 LEXUS ES300 (RM511U)

WIRELESS DOOR LOCK CONTROL SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system is operating normally. Accordingly, before troubleshooting the wireless door lock control sys-
tem, first make certain that the door lock control system is operating normally.
Perform troubleshooting in accodnce with procedure on the following page.

DI0DR–01

WIRELESS DOOR LOCK CONTROL System Check Sheet

Customer’s Name

Registration No.

Registration

Year

Frame No.

Odometer Reading

Inspector’s
Name

km
Miles

/

/

/

/

/

/

Date Vehicle Brought In

Date Problem First Occurred

Frequency Problem Occurs

Weather Conditions
When Problem Oc-
curred

Date Transmitter Battery Last Replaced

Weather

Outdoor Temperature

Place

Constant

Sometimes ( times/per day, month)

Once only

Fine

Cloudy

Rainy

Snowy

Various/Others

Hot

Warm

Cool

Cold (Approx.

°

F (

°

C))

Everywhere

Specific Locality( )

/

/

Problem Symptom

Whole wireless door lock control system does not operate.

Only door unlock operation is not possible.

Only door lock operation is not possible.

Only key confinement prevention function is not possible.

Wireless door lock function operates even each door is opened.

Wireless door lock function incorrectly.
( Although one door is unlocked, when the transmit-
ter switch is pressed, all doors unlock.)

When RH door is unlocked
When LH door is unlocked

Others

DI–442

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DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

594

1997 LEXUS ES300 (RM511U)

CUSTOMER PROBLEM ANALYSIS CHECK

DI0DS–01

To make the vehicle be in the initialized condition.
Initialized condition is the condition when the following conditions are satisfied.
(1) Key plate has not been inserted in the ignition key cylinder.
(2) All the doors are closed. (Door warning light is off.)
(3) All the doors are locked.
(4) The buzzer volume is maximum.

Basic function check
With a standard operation, when repeating the operations of UNLOCK switch and LOCK switch three times or
more alternately, check the operation of UNLOCK – LOCK from 3rd time onward.

Following procedures are standard operation.

(1) Depart about 1 M to the right direction from the outside handle of a driver’s seat.
(2) Point the transmitter toward the vehicle and press either of transmitter switch for about 1 sec.
<Reference>
As of the security function, even the wireless function is normal, there may be the case that only UNLOCK opera-
tion will not work.

Normal
<Reference>

Operative distance may differ depends on the operator,

the way of holding or the position.

Because of the use of weak electric wave, in case of

strong wave or noise in the frequency used, there may
be the case that operative distance gets shorter.

No

Yes

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DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

DI–443

595

1997 LEXUS ES300 (RM511U)

PRE–CHECK

Wireless function (Remote control) will not operate.

Transmitter battery check:
Charge the transmitter battery to a new or normal one,
check UNLOCK operation of the transmitter with the
standard operation.
<Reference>

New or normal battery is necessary.

Battery quality can be judged by checking the rem-

nant volume of the battery.

Yes

No

Battery faulty.

To make the vehicle be in the initialized condition.

Enter diagnostic mode:
If operation the wireless door lock ECU in the order of 1 through 2, the mode turns to diagnostic mode.
(1) Insert the key plate into the ignition key cylinder and pull out, then insert it again and turn the ignition
switch OFF

→

ON

→

OFF 1 time.

(2) After completing the procedure (1) and within 30 seconds, turn the ignition switch OFF to ON to OFF
nine times.
<Reference>

In the case that either one of (1) and (2) conditions is not satisfied, transfer to normal mode.

Once

Nine times

Within. 30 sec.

Within. 5 sec.

1

2

3

9

10

Key Plate Not Inserted

Key Plate Inserted

Ignition Switch ON

Ignition Switch OFF

No

DI–444

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DIAGNOSTICS

WIRELESS DOOR LOCK CONTROL SYSTEM

596

1997 LEXUS ES300 (RM511U)