Lexus RX300 (MCU15). Service manual - part 349

I19265

Passenger Door ECU

LSWE

A–

A+

LSW

24

2

16

L–R

6

19

KL

KUL

13

L–Y

GR–R

GR

P

P–L

2 (*1)

D10 (*1)
D9 (*2)

Door Lock Motor

Door Unlock
Detection Switch

Door Key Lock and 
Unlock Switch

F17

4 (*2)

1 (*1)

3 (*2)

6 (*1)

7 (*2)

5 (*1)

8 (*2)

3 (*1)

2 (*2)

4 (*1)

1 (*2)

*1: LHD
*2: RHD

F17

F17

F17

F17

F17

Lock

Unlock

DI–628

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

Door lock motor circuit

WIRING DIAGRAM

DI2EZ–06

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–629

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

HINT:
In case of using the hand–held tester, start the inspection from step 1 and in case of not using the hand–held
tester, start from step 2.

1

Check door lock motor using hand–held tester.

PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check that the door lock motor can operate in an ACTIVE TEST.

OK

Proceed to next circuit inspection shown on
problem symptom table (See page DI–570).

NG

2

Check door lock motor (See page BE–97).

NG

Replace the door lock motor.

OK

3

Check wireharness and connector between door lock motor and driver door
ECU.

NG

Repair or replace wireharness or connector.

OK

Proceed to next circuit inspection shown on
problem symptoms table 
(See page DI–570).

I19265

Passenger Door ECU

LSWE

A–

A+

LSW

24

2

16

L–R

6

19

KL

KUL

13

L–Y

GR–R

GR

P

P–L

2 (*1)

D10 (*1)
D9 (*2)

Door Lock Motor

Door Unlock
Detection Switch

Door Key Lock and 
Unlock Switch

F17

4 (*2)

1 (*1)

3 (*2)

6 (*1)

7 (*2)

5 (*1)

8 (*2)

3 (*1)

2 (*2)

4 (*1)

1 (*2)

*1: LHD
*2: RHD

F17

F17

F17

F17

F17

Lock

Unlock

DI–630

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

Door unlock detection switch

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

DI2F0–08

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–631

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

HINT:
In case of using the hand–held tester, start the inspection from step 1 and in case of not using the hand–held
tester, start from step 2.

1

Check door unlock detection switch using hand–held tester.

PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the door unlock detection switch using DATA LIST.

OK

Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).

NG

2

Check door unlock detection switch (See page BE–97).

NG

Replace the door lock motor.

OK

3

Check wireharness and connector between door unlock detection switch and
passenger door ECU.

NG

Repair or replace wireharness or connector.

OK

Proceed to next circuit inspection shown on
problem symptoms table 
(See page DI–570).