Lexus RX300 (MCU15). Service manual — part 354

DI2FC–06

I08137

Rear Left Door ECU

SIG

14

4

BDR

CPUB

GND

2

E

J3

1

2I

1H

G–B

D

2

1

7

J4

1C

1A

6

5

1

W

2A

3

4

BA1

IA2

BA1

ECU–B

9

10

Ignition Switch

3

2

1

1G

6

25

15

J/C

R14

Instrument Panel J/B

Battery

Engine Room J/B

G–B

G–B

W–R

Short Pin

W

1H

D RR DOOR *1
P RR DOOR *2

AM1

R14

L–Y

L–Y

L–Y

BA1

IA1

1

3

R14

9

BA1

R–L

R–L

R–L

B–Y

W–L

Instrument Panel J/B

Instrument Panel J/B

1H

1C

GAUGE

R14

W–B

13

W–B

BJ

W

ALT

F11
FL
Block

(*1)

W–L

(*2)

2

1

*1: LHD
*2: RHD

DI–648

–

DIAGNOSTICS

REAR LEFT DOOR CONTROL SYSTEM

LEXUS RX300 (RM785E)

CIRCUIT INSPECTION

Power source circuit

CIRCUIT DESCRIPTION

This circuit provides power to operate the rear left door ECU.

WIRING DIAGRAM

–

DIAGNOSTICS

REAR LEFT DOOR CONTROL SYSTEM

DI–649

LEXUS RX300 (RM785E)

INSPECTION PROCEDURE

1

Check ECU–B, GAUGE and D RR DOOR fuse.

CHECK:
Check continuity of ECU–B,GAUGE and D RR DDOR fuse.
OK:
Continuity

NG

Replace the failure fuse.

OK

2

Check voltage between terminals BDR,CPUB, SIG and GND of rear left 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 rear left 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–647).

NG

DI–650

–

DIAGNOSTICS

REAR LEFT DOOR CONTROL SYSTEM

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.

I03215

D9 Door Lock Motor
and Door Unlock
Detection Switch

Rear Left Door ECU

LSWE

A–

A+

LSW

17

13

1

19

2

3

6

4

GR–R

L–B

L–R

GR

R14

R14

R14

R14

–

DIAGNOSTICS

REAR LEFT DOOR CONTROL SYSTEM

DI–651

LEXUS RX300 (RM785E)

Door lock motor circuit

WIRING DIAGRAM

DI2FD–06