Lexus ES300 (1997 year). Manual - part 412

N22068

Theft Deterrent ECU

LUG

9

G–W

C

C

J34

J/C

G–W

2

G–W

2

1

Luggage Compartment
Door Key Lock and
Unlock Switch

W–B

J34

T4

IF2

BP

AB0119
N20683

I00636

ON

1

(+)

(–)

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

DI–425

577

1997 LEXUS ES300   (RM511U)

Luggage Compartment Door Key Lock and Unlock Switch Circuit

CIRCUIT DESCRIPTION

The luggage compartment door key lock and unlock switch goes on when the luggage compartment door
key cylinder is turned to the unlock side with the key.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check voltage between terminal 1 of luggage compartment door key lock and
unlock switch connector and body ground.

PREPARATION:
(a)

Remove luggage compartment door trim.

(b)

Turn ignition switch ON.

CHECK:
Measure voltage between terminal 1 of luggage compartment
door key lock and unlock switch connector and body ground,
when the key is turned to the unlock side and not turned.
OK:

Key operation

Voltage

Turned to the unlock side

0 V

Not turned

Battery positive voltage

OK

Check and replace theft deterrent ECU.*1

DI024–01

N20682

2

1

DI–426

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

578

1997 LEXUS ES300   (RM511U)

NG

2

Check luggage compartment door key lock and unlock switch.

PREPARATION:
Disconnect luggage compartment door key lock and unlock
switch connector.
CHECK:
Check continuity between terminals 1 and 2, when the key is
turned to the unlock side and not turned.
OK:

Key operation

Tester connection

Specified condition

Turned to unlock

1 – 2

Continuity

Not turned

–

No continuity

NG

Repair or replace luggage compartment door
key lock and unlock switch.

OK

3

Check harness and connector between theft deterrent ECU and key lock and un-
lock switch, key lock and unlock switch and body ground (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace theft deterrent ECU.

*1: When there is a malfunction that the theft deterrent system
cannot be set, proceed to the next numbered circuit inspection
shown on matrix chart (See page 

DI–405

).

N22069

Theft Deterrent ECU

DSWL

T4

5

R–Y

6

IF2

R–Y

2

Luggage Compartment
Door Courtesy Switch

1

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

DI–427

579

1997 LEXUS ES300   (RM511U)

Luggage compartment Door Courtesy Switch Circuit

CIRCUIT DESCRIPTION

The luggage compartment door courtesy switch goes on when luggage compartment door is opened and
goes off when the luggage compartment door is closed.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check operation of luggage compartment door courtesy light.

CHECK:
Check that luggage compartment door courtesy light goes off when luggage compartment door courtesy
switch is pushed, and comes on when switch is not pushed.

NG

Check and repair luggage compartment door
courtesy light circuit (See page 

BE–46

).

OK

DI025–01

DI–428

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

580

1997 LEXUS ES300   (RM511U)

2

Check for open in harness and connector between theft deterrent ECU and lug-
gage compartment door courtesy switch (See page 

IN–27

).

NG

Repair or replace harness or connectors.

OK

Check and replace theft deterrent ECU.*1

*1: When there is a malfunction that the theft deterrent system
cannot be set, proceed to the next numbered circuit inspection
shown on matrix chart (See page 

DI–405

).