Lexus ES300 (1997 year). Manual - part 415

N22481

Theft Deterrent ECU

DSWD

CTY

DSWP

Door Courtesy
Switch Front LH

1

1

Door Courtesy
Switch Rear LH

1

Door Courtesy
Switch Rear RH

1

Door Courtesy
Switch Front RH

R–G

T4

T4

T4

R–G

R–G

R–G

R–G

R–G

R–G

R–W

R–W

R–W

R–B

J11

J10

E

E

E

D

D

D

J34

J34

J34

J35

J/C

2

3

1

J34

J34

J35

E

E

D

7

IP1

IP1

R–W 1

2

Diode

J/C

9

4

1S

1G

12

1S

1G

1

7

J/C

Instrument Panel J/B

Instrument Panel J/B

R–W

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

DI–437

589

1997 LEXUS ES300   (RM511U)

Door Courtesy Switch Circuit

CIRCUIT DESCRIPTION

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

WIRING DIAGRAM

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 and repair open door warning light cir-
cuit.

DI02A–01

DI–438

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

590

1997 LEXUS ES300   (RM511U)

OK

2

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

IN–27

).

NG

Repair or replace harness or connector.

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

).

N22073

Theft Deterrent ECU

DSWH

T4

4

B

IJ1

1

B

3

B

1

Engine Hood
Courtesy Switch

2

W–B

EC

IM1

N14878

1 (+)

2 (–)

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

DI–439

591

1997 LEXUS ES300   (RM511U)

Engine Hood Courtesy Switch Circuit

CIRCUIT DESCRIPTION

The engine hood courtesy switch is built into the engine hood lock assembly and goes on when the engine
hood is opened and goes off when the engine hood is closed.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check engine hood courtesy switch.

PREPARATION:
(a)

Remove engine hood lock assembly.

(b)

Disconnect engine hood courtesy switch connector.

CHECK:
Check continuity between terminals 1 and 2 when engine hood
lock is locked and unlocked.
OK:

Engine hood lock

Tester connection

Specified condition

LOCK

–

No continuity

UNLOCK

1 – 2

Continuity

NG

Replace engine hood courtesy switch.

OK

DI02B–01

DI–440

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

592

1997 LEXUS ES300   (RM511U)

2

Check harness and connector between theft deterrent ECU and switch, switch
and body ground (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace theft deterrent ECU
(See page 

IN–27

).