Lexus RX300 (MCU15). Service manual - part 343

DI–604

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

Check ECU–B, GAUGE and FR DOOR fuse.

CHECK:
Check continuity of ECU–B,GAUGE and FR DOOR fuse.
OK:
Continuity

NG

Replace the failure fuse.

OK

2

Check voltage between terminals BDR,CPUB, SIG and GND of driver door ECU
connector.

PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals SIG, and GND.
OK:

Voltage: 10 – 14V

PREPARATION:
(a)

Turn ignition switch OFF.

(b)

Disconnect the driver door ECU connector.

CHECK:
Measure voltage between terminals BDR, CPUB and GND.
OK:

Voltage: 10 – 14V

OK

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

NG

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–605

LEXUS RX300   (RM785E)

3

Check wireharness and connector between ECU and body ground.

NG

Repair or replace wireharness or connector.

OK

Check and repair wireharness and connector
between ECU and battery.

I19265

Driver Door ECU

LSWE

A–

A+

LSW

24

2

16

L–R

6

19

KL

KUL

13

L–Y

GR–R

GR

P

P–L

4 (*1)

D7 (*1)
D8 (*2)
Door Lock Motor LH

Door Lock Motor

Door Unlock
Detection Switch

Door Key Lock and 
Unlock Switch

D12

D12

D12

D12

D12

D12

2 (*2)

3 (*1)

1 (*2)

7 (*1)

6 (*2)

8 (*1)

5 (*2)

2 (*1)

3 (*2)

1 (*1)

4 (*2)

*1: LHD
*2: RHD

DI–606

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

Door lock motor circuit

WIRING DIAGRAM

DI2BO–06

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–607

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).