Lexus RX300 (MCU15). Service manual - part 342

DI2BJ–11

I19270

Driver Door ECU

Door Lock Assembly
D Door Courtesy Switch
D Door Unlock Detection Switch
DDoor Lock Motor

Power Window Motor
D Jam Protection Limit Switch
D Jam Protection Pulse Switch

Courtesy Light

DI–600

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

PARTS LOCATION

DI2BK–12

I07350

D12

DRIVER DOOR ECU

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–601

LEXUS RX300   (RM785E)

TERMINALS OF ECU

Symbols (Terminals No.)

Wiring Color

Condition

STD Voltage (V)

UP ↔ GND 

R ↔ W B

Ignition switch ON and driver’s window switch OFF

Below 1.0

UP ↔ GND 

(D12–1 ↔ D12–25)

R ↔ W–B

Ignition switch ON and driver’s window switch UP

10 – 14

A– ↔ GND 

L Y ↔ W B

Door lock switch OFF or LOCK

Below 1.0

A  ↔ GND 

(D12–2 ↔ D12–25)

L–Y ↔ W–B

Door lock switch UNLOCK

10 – 14

SIG ↔ GND 

(D12–5 ↔ D12–25)

R–L ↔ W–B

Ignition switch ON

10 – 14

KL ↔ GND 

P ↔ W B

Door key lock and unlock switch OFF or UNLOCK

10 – 14

KL ↔ GND 

(D12–6 ↔ D12–25)

P ↔ W–B

Door key lock and unlock switch LOCK

Below 1.0

LMT ↔ SGND 

LG ↔ LG R

Driver’s door window fully–closed position

10 – 14

LMT ↔ SGND 

(D12–8 ↔ D12–12)

LG ↔ LG–R

Driver’s door window except fully–closed position

Below 1.0

A+ ↔ GND 

L R ↔ W B

Door lock switch OFF or UNLOCK

Below 1.0

A+ ↔ GND 

(D12–13 ↔ D12–25)

L–R ↔ W–B

Door lock witch LOCK

10 – 14

BDR ↔ GND 

(D12–14 ↔ D12–25)

L–B ↔ W–B

Constant

10 – 14

DN ↔ GND 

G ↔ W B

Ignition switch ON and driver’s window switch OFF

Below 1.0

DN ↔ GND 

(D12–15 ↔ D12–25)

G ↔ W–B

Ignition switch ON and driver’s window switch DOWN

10 – 14

LSW ↔ GND 

GR ↔ W B

Driver’s door is locked

10 – 14

LSW ↔ GND 

(D12–16 ↔ D12–25)

GR ↔ W–B

Driver’s door is unlocked

Below 1.0

CTY ↔ GND 

R W ↔ W B

Driver’s door is closed

10 – 14

CTY ↔ GND 

(D12–17 ↔ D12–25)

R–W ↔ W–B

Driver’s door is open

Below 1.0

CPUB ↔ GND 

(D12–18 ↔ D12–25)

G–B 

*1

 ↔ W–B

  W–L 

*2

Constant

10 – 14

KUL ↔ GND 

P L ↔ GR R

Door key lock and unlock switch OFF or LOCK

10 – 14

KUL ↔ GND 

(D12–19 ↔ D12–25)

P–L ↔ GR–R

Door key lock and unlock switch UNLOCK

Below 1.0

During the driver’s door power window is operate.

Pulse generation

PLS ↔ SGND 

(D12 20 ↔ D12 12)

LG–B ↔ W–B

Driver’s door power window not operate with switch ON

Below 1.0

(D12–20 ↔ D12–12)

Driver’s door power window not operate with switch OFF

10 – 14

CTYB ↔ CYL 

L B ↔ G W

Driver’s door closed

Below 1.0

CTYB ↔ CYL 

(D12–21 ↔ D12–4)

L–B ↔ G–W

Driver’s door open

10 – 14

*: Power window master switch
*1: LHD   *2: RHD

DI2BL–03

DI–602

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

PROBLEM SYMPTOMS TABLE

POWER WINDOW CONTROL SYSTEM

Symptom

Suspect Area

See page

All the power windows does not operate.

1. Driver door ECU with master switch

–

Power window does not operate.

1. Driver door ECU with master switch

–

Auto up (or down) function does not operate.

1. Driver door ECU with master 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. Driver door ECU with master switch

DI–616

DI–618

–

OTHERS

Symptom

Suspect Area

See page

Parts of the door does not function.

1. Power source circuit

2. Driver door ECU with master switch

DI–603

DI2BM–13

I19264

SIG

IC2

25

BDR

CPUB

GND

W–B

18

12

9

14

5

D14

J/C

Instrument Panel J/B

Driver Door ECU

D14

D14

D14

1G

10

IC1

J5

A

L–B (*1)

L–B (*1)

(*1)

4

Short Pin

ECU–B

Engine Room J/B

*1: LHD
*2: RHD

IE (*1)
IG (*2)

12

IL1

(*2)

W–B

A

J9

(*1)

(*2)

2A

W

Battery

FL DOOR

1

2I

2

2A

1

5

(*1)

W–L (*2)

W–R

R–L

W

F11 FL Block

ALT

3

P FR DOOR

L–B (*2)

IL1

1

L–B (*2)

1H

6

G–B (*1)

W–L (*2)

G–B (*1)

IL1

9

IC1

9

(*2)

(*1)

IL1

4

IC1

4

(*2)

R–L

1D

1

IG1

B–Y

AM1

GAUGE

1C

7

4

AM1

2

W–L

1C

6

2

1

1A

1

1D

12

W

Ignition 
SW

L–B (*2)

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–603

LEXUS RX300   (RM785E)

CIRCUIT INSPECTION

Power source circuit

CIRCUIT DESCRIPTION

This circuit provides power to operate the driver door ECU.

WIRING DIAGRAM