Lexus RX300 (MCU15). Service manual - part 348

DI2EW–03

DI–624

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

PROBLEM SYMPTOMS TABLE

POWER WINDOW CONTROL SYSTEM

Symptom

Suspect Area

See page

Power window does not operate.

1. Passenger door ECU with power window switch

–

Auto up (or down) function does not operate.

1. Passenger door ECU with power window switch

–

Jam protection function and auto up (or down) function does not

operate.

1. Jam protection limit switch circuit

2. Jam protection pulse switch circuit

3. Passenger door ECU with power window switch

DI–638

DI–640

–

OTHERS

Symptom

Suspect Area

See page

Parts of the door does not function.

1. Power source circuit

2. Passenger door ECU

DI–625

DI2EX–09

I19266

Passenger Door 
ECU

SIG

18

5

W–R

BDR

CPUB

GND

5

Short Pin

C

ECU–B

14

25

IL1

L–B (*2)

1

Ignition 
SW

3

ALT

9

IC2

F17

W–B

J20
J/C

IG1

F17

9

F17

W–L

1D

Instrument Panel J/B

F17

3

F11 FL Block

W

L–B (*2)

C

L–B (*2)

(*1)

IC1

9

(*2)

L–B (*1)

IL1

1

1D

10

R–L

IL1

4

(*1)

IC1

4

(*2)

R–L

W–L

1D

2

GAUGE

B–Y

IG (*1)
IE (*2)

P FR DOOR

1C

7

4

AM1

2

W–L

1C

6

2

1

1A

1

1D

12

IC1

IL1

12

12

(*2)

(*1)

W–B

J5

J9

A

A

(*2)

(*1)

*1: LHD
*2: RHD

FL DOOR

L–B
(*2)

Battery

W

W–R

Engine Room J/B

2I

1

2A

4

2A

2

L–B (*1)

AM1

J/C

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–625

LEXUS RX300   (RM785E)

CIRCUIT INSPECTION

Power source circuit

CIRCUIT DESCRIPTION

This circuit provides power to operate the passenger door ECU.

WIRING DIAGRAM

DI–626

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

Check ECU–B, GAUGE and P FR DOOR fuse.

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

NG

Replace the failure fuse.

OK

2

Check voltage between terminals BDR,CPUB, SIG and GND of passenger 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 passenger 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–624).

NG

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–627

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.