Lexus RX300 (MCU15). Service manual - part 345

I03216

D5
Door Courtesy Light Front LH (*1)
D6
Door Courtesy Light Front RH (*2)

Driver Door ECU

+B

10 (*1)
11 (*2)

2

1

CTYB

CYL

CTY

CTYE

D7
Door Courtesy Switch LH (*1)
D8
Door Courtesy Switch RH (*2)

21

4

17

23

L–B

R–W

G–W

R–B

CPU

D12

D12

D12

D12

*1: LHD
*2: RHD

11 (*1)
10 (*2)

DI–612

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

Door courtesy light and courtesy switch circuit

CIRCUIT DESCRIPTION

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

WIRING DIAGRAM

DI2BR–12

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–613

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

Check operation of door courtesy light.

CHECK:
Check that door courtesy light comes on when door opened, and goes off when door is closed.
OK:
Must be operated normally.

OK

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

NG

2

Check courtesy light (See page BE–48).

NG

Replace the courtesy light.

OK

3

Check courtesy switch (See page BE–48).

NG

Replace the courtesy switch.

OK

4

Check wireharness and connector between courtesy light and driver door ECU,
courtesy switch 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).

I03214

P7
Power Window Motor Front LH (*1)
P8
Power Window Motor Front RH (*2)

R

Driver Door ECU

G

UP

DN

PLS

LMT

SGND

1

15

20

8

12

LG–B

LG

LG–R

Power Window
Motor

Pulse Sensor

Limit SW

1 (*1)

2 (*2)

3

4

5

D12

D12

D12

D12

D12

2 (*1)

1 (*2)

*1: LHD
*2: RHD

DI–614

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

Power window motor circuit

WIRING DIAGRAM

DI2BS–12

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–615

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 power window motor using hand–held tester.

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

OK

Proceed to next circuit inspection shown on
problem symptoms table (See page DI–602).

NG

2

Check power window motor (See page BE–84).

NG

Replace the power window motor.

OK

3

Check wireharness and connector between power window 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–602).