Lexus RX300 (MCU15). Service manual - part 341

I19263

Body ECU

B7 PKB

R–B

19

P3
Parking Brake SW

J/B No. 5

1

R–W

2

5A

6

5A

DI–596

–

DIAGNOSTICS

BODY CONTROL SYSTEM

LEXUS RX300   (RM785E)

Parking brake switch circuit

WIRING DIAGRAM

DI1P5–05

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–597

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 parking brake switch using hand–held tester.

PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the parking brake switch using DATA LIST.

OK

Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).

NG

2

Check parking brake switch (See page BE–68).

NG

Replace the parking brake switch.

OK

3

Check wireharness and connector between parking brake switch and Body ECU.

NG

Repair or replace wireharness or connector.

OK

Proceed to next circuit inspection shown on
problem symptoms table
(See page DI–570).

DI2BH–12

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–599

P. DI–603

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–602

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

DI–598

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

LEXUS RX300   (RM785E)

DRIVER 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.

DI2BI–03

DRIVER 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 Door Lock Control System

"" Theft Deterrent System

"" Others

"" Jam Protection System

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–599

LEXUS RX300   (RM785E)

CUSTOMER PROBLEM ANALYSIS CHECK