Lexus RX300 (MCU15). Manual - part 347

DI2ES–08

Customer Problem Analysis

Vehicle Brought to Workshop

Problem Symptom Confirmation

Symptom Simulation

Symptom does not
occur

Circuit Inspection

Identification of Problem

Repair

Confirmation Test

End

Titles inside

are titles of pages in this

manual, with the page number indicated in
the bottom portion. See the indicated pages
for detailed explanations.

1

2

3

6

5

8

P. IN–22

P. DI–678

P. DI–621

P. DI–625

Symptom
occur

Step 6, 8 : Diagnostic steps permitting the use of the 
                 hand–held tester.

7

Multiplex communication system inspection *

4

Problem Symptoms Table

P. DI–624

*: Confirm that there is no trouble by
basic inspection and DTC check

DI–620

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

PASSENGER DOOR CONTROL SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:
This ECU is connected to the multiplex communication system. Therefore, be sure to check that there is no
troubles in the multiplex communication system before performing the troubleshooting.

DI2ET–03

PASSENGER DOOR CONTROL SYSTEM Check Sheet

Inspector’s name:

Customer’s Name

Date Vehicle

Registration No.

Registration Year

Frame No.

Odometer Reading

             /               /

km
Mile

Weather Conditions
When Problem
Occurred

Date Problem First Occurred

Frequency Problem Occurs

Weather

                              /                                /

"" Once only

Brought in

Malfunction
System

Outdoor Temperature

"" Fine    "" Cloudy     ""Rainy     ""Snowy
"" Various/ Others

"" Hot       ""Warm       "" Cool
"" Cold (Approx.     °F (     °C))

"" Constant        "" Sometimes (    times per     day, month)

"" Power Window Control System

"" Power Mirror Control System

"" Power Door Lock Control System

"" Theft Deterrent System

"" Others

"" Jam Protection System

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–621

LEXUS RX300   (RM785E)

CUSTOMER PROBLEM ANALYSIS CHECK

DI2FS–09

I19271

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

Passenger Door ECU

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

Courtesy Light

DI–622

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

PARTS LOCATION

DI2EV–10

I07350

F17

PASSENGER DOOR ECU

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–623

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 

(F17–1 ↔ F17–25)

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 

(F17–2 ↔ F17–25)

L–Y ↔ W–B

Door lock switch UNLOCK

10 – 14

SIG ↔ GND 

(F17–5 ↔ F17–25)

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 

(F17–6 ↔ F17–25)

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 

(F17–8 ↔ F17–12)

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 

(F17–13 ↔ F17–25)

L–R ↔ W–B

Door lock witch LOCK

10 – 14

BDR ↔ GND 

(F17–14 ↔ F17–25)

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 

(F17–15 ↔ F17–25)

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 

(F17–16 ↔ F17–25)

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 

(F17–17 ↔ F17–25)

R–W ↔ W–B

Driver’s door is open

Below 1.0

CPUB ↔ GND 

(F17–18 ↔ F17–25)

W–L ↔ W–B

Constant

10 – 14

KUL ↔ GND 

P L ↔ W B

Door key lock and unlock switch OFF or LOCK

10 – 14

KUL ↔ GND 

(F17–19 ↔ F17–25)

P–L ↔ W–B

Door key lock and unlock switch UNLOCK

Below 1.0

During the driver’s door power window is operate.

Pulse generation

PLS ↔ SGND 

(F17 20 ↔ F17 12)

LG–B ↔ LG–R

Driver’s door power window not operate with switch ON

Below 1.0

(F17–20 ↔ F17–12)

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 

(F17–21 ↔ F17–4)

L–B ↔ G–W

Driver’s door open

10 – 14