Lexus ES300 (1997 year). Service manual — part 414

N22071

Theft Deterrent ECU

UL3

L2

UL2

7

6

8

B

B

J/C
J7

3

3

Door Key Lock and
Unlock Switch LH

2

4

B

J/C
J33

B

A

A

3

4

B

Door Key Lock and
Unlock Switch RH

2

3

1

A

A

J/C
J36

20

1

A

A

J/C
J38

20

Instrument Panel J/B

T4

T4

T4

L

L

IO2

IO2

L–W

L–W

L–W

L–W

L–W

R–G

R–G

R–G

IE2

IE2

W–B

W–B

W–B

W–B

W–B

W–B

W–B

IL

IF

1V

1G

IE2

IO2

7

3

LOCK

LOCK

UNLOCK

UNLOCK

L

N20684

1

2

3

(–)

(+)

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

DI–433

585

1997 LEXUS ES300 (RM511U)

Door Key Lock and Unlock Switch Circuit

CIRCUIT DESCRIPTION

The door key lock and unlock switch is built in the door key cylinder. When the key is turned to the lock side,
terminal 1 of the switch is grounded and when the key is turned to the unlock side, terminal 2 of the switch
is grounded.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check door key lock and unlock switch.

PREPARATION:
(a)

Remove the door trim and service hole cover.

(b)

Disconnect the door key lock and unlock switch connec-
tor.

CHECK:
Check continuity between terminals 1, 2 and 3 of door key lock
and unlock switch connector, when door key lock and unlock
switch is turned to the lock side, unlock side and not turned.
OK:

Switch position

Tester connection

Specified condition

Lock side

2 – 3

Continuity

Unlock side

1 – 3

Continuity

OFF

–

No continuity

DI028–01

DI–434

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

586

1997 LEXUS ES300 (RM511U)

NG

Replace door key lock and unlock switch.

OK

2

Check harness and connectors between 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.*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

).

N22072

Theft Deterrent ECU

LSWD

LSWP

LSWR

16

17

18

C

J/C

C

A

F

F

C

C

J/C
J33

J/C
J7

11

11

2

3

4

1

Door Unlock Detection
Switch Front LH

Door Unlock Detection
Switch Front RH

4

4

B

B

J/C
J36

B

B

Door Unlock Detection
Switch Rear LH

1

4

Door Unlock Detection
Switch Rear RH

1

4

20

20

6

9

7

3

A

J/C
J37

J/C
J38

Instrument panel J/B

4

1

T4

T4

T4

L–Y

L–Y

L–Y

L–Y

L–Y

L–Y

L–Y

W–B

W–B

W–B

W–B

W–B

L–R

L–R

L–R

W–B

W–B

W–B

W–B

W–B

W–B

W–B

IE1

IO1

IE2

IO2

1G

1V

IL

Y

Y

Y

J11

J11

J10

IM

BO

BN

IF

BR1

IP1

BQ1

IF3

BR1

BQ1

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

DI–435

587

1997 LEXUS ES300 (RM511U)

Door Unlock Detection Switch Circuit

CIRCUIT DESCRIPTION

The door unlock detection switch is built in the door lock motor assembly. This switch is on when the door
lock knob is in the unlock position and off when the lock knob is in the lock position. The ECU detects the
door lock knob conditions is this circuit. It is used as one of the operating conditions for the key confinement
prevention function.

WIRING DIAGRAM

DI029–01

N20685

N20686

I00637

LOCK

UNLOCK

4

1

(+)

(–)

DI–436

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

588

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Check Door Unlock Detection Switch.

PREPARATION:
(a)

Remove the door trim and service hole cover.

(b)

Disconnect door unlock detection switch connector.

CHECK:
Check continuity between terminals 1 and 4 of door unlock
detection switch connector, when the door lock knob is oper-
ated to the lock side and unlock side.
OK:

Switch Condition

Tester connection

Specified condition

Door unlock

1 – 4

Continuity

Door lock

–

No continuity

NG

Replace door unlock detection switch.

OK

2

Check harness and connectors between ECU and door unlock detection switch,
door unlock detection switch and body ground (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

).