Lexus RX300 (MCU15). Manual — part 333
DI1OD–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–565
P. DI–572
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–570
*: Confirm that there is no trouble by
basic inspection and DTC check
DI–564
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
BODY 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 trouble shooting.
DI1OE–04
BODY 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
"" Key Reminder System
Malfunction
System
Outdoor Temperature
"" Fine "" Cloudy ""Rainy ""Snowy
"" Various/ Others
"" Hot ""Warm "" Cool
"" Cold (Approx. °F ( °C))
"" Constant "" Sometimes ( times per day, month)
"" Headlight and Taillight System
"" Illuminated Entry System
"" Light Control System
"" Wiper and Washer System
"" Seat Belt Warning
"" Power Window Control System
"" Power Door Lock Control System
"" Theft Deterrent System
"" Wireless Door Lock Control System
"" Others
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–565
LEXUS RX300 (RM785E)
CUSTOMER PROBLEM ANALYSIS CHECK
DI3JL–02
I19136
Brake Fluid Level Warning Switch
Engine Hood Courtesy Switch
Combination Switch
D Light Control Switch
D Headlight Dimmer Switch
D Rear Wiper Switch
Key Unlock Warning Switch
Hazard Warning
Switch
Theft Deterrent
Indicator
Instrument Panel J/B
D RADIO No.2 Fuse
D RR WIP Fuse
D GAUGE Fuse
Parking Brake Switch
Buckle Switch
Wireless Door Lock Receiver
Vanity Light
Personal Light
Vanity Light
Front Interior Light
Rear Interior Light
Rear Wiper Motor
Back Door Lock Motor
Back Door Courtesy Switch
Europe:
Except Europe:
Center Cluster Integration Panel
D Theft Deterrent Indicator
DI–566
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
PARTS LOCATION
DI1OG–16
I07384
B5
B6
B7
B8
Body ECU
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–567
LEXUS RX300 (RM785E)
TERMINALS OF ECU
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
GND2 ↔ Body Ground
(B8–2 ↔ Body Ground)
W–B
Constant
Below 1.0
BSUB ↔ GND 1, 2
(B8–4 ↔ B5–9, B8–2)
L–B ↔ W–B
Constant
10 – 14
IG ↔ GND 1, 2
R L ↔ W B
Ignition switch ACC or OFF
Below 1.0
IG ↔ GND 1, 2
(B8–5 ↔ B5–9, B8–2)
R–L ↔ W–B
Ignition switch ON
10 – 14
FFGO ↔ GND1, 2
BR W ↔ W B
Fog light switch OFF
10 – 14
FFGO ↔ GND1, 2
(B8–6 ↔ B5–9, B8–2)
BR–W ↔ W–B
Fog light switch ON
Below 1.0
TRLY ↔ GND1, 2
G W ↔ W B
Ignition switch ON, light control switch OFF
10 – 14
TRLY ↔ GND1, 2
(B8–7 ↔ B5–9, B8–2)
G–W ↔ W–B
Ignition switch ON, light control switch TAIL
Below 1.0
HAZ ↔ GND1, 2
LG B ↔ W B
Hazard warning switch OFF
10 – 14
HAZ ↔ GND1, 2
(B8–11 ↔ B5–9, B8–2)
LG–B ↔ W–B
Hazard warning switch ON
Below 1.0
RFOG ↔ GND1, 2
G B ↔ W B
Rear fog light switch OFF
10 – 14
RFOG ↔ GND1, 2
(B8–13 ↔ B5–9, B8–2)
G–B ↔ W–B
Rear fog ligh switch ON
Below 1.0
SNOW ↔ GND1, 2
Y B ↔ W B
Pattern select switch SNOW
Below 1.0
SNOW ↔ GND1, 2
(B8–15 ↔ B5–9, B8–2)
Y–B ↔ W–B
Pattern select switch except SNOW, Ignition switch ON
10 – 14
IND ↔ GND1, 2
LG ↔ W B
Security indicator light lights up
3 – 6
IND ↔ GND1, 2
(B8–16 ↔ B5–9, B8–2)
LG ↔ W–B
Security indicator light does not light up
Below 1.0
ACC ↔ GND1, 2
GR ↔ W B
Ignition switch OFF
Below 1.0
ACC ↔ GND1, 2
(B8–18 ↔ B5–9, B8–2)
GR ↔ W–B
Ignition switch ACC
10 – 14
BCTY ↔ GND1, 2
W R ↔ W B
Back door courtesy switch OFF (closed)
10 – 14
BCTY ↔ GND1, 2
(B7–5 ↔ B5–9, B8–2)
W–R ↔ W–B
Back door courtesy switch ON (open)
Below 1.0
DBKL ↔ GND1, 2
G W ↔ W B
Driver’s seat belt buckle switch OFF (belt fastened)
10 – 14
DBKL ↔ GND1, 2
(B7–7 ↔ B5–9, B8–2)
G–W ↔ W–B
Driver’s seat belt buckle switch ON (belt unfastened)
Below 1.0
KSW ↔ GND1, 2
L ↔ W B
Ignition key inserted
Below 1.0
KSW ↔ GND1, 2
(B7–8 ↔ B5–9, B8–2)
L ↔ W–B
Ignition key not inserted
10 – 14
HR ↔ GND1, 2
L O ↔ W B
Ignition switch ON and blower motor not operate
10 – 14
HR ↔ GND1, 2
(B7–9 ↔ B5–9, B8–2)
L–O ↔ W–B
Ignition switch ON and blower motor operate
Below 1.0
ILE ↔ GND1, 2
R Y ↔ W B
Each door open
Below 2.0
ILE ↔ GND1, 2
(B7–10 ↔ B5–9, B8–2)
R–Y ↔ W–B
All door closed
10 – 14
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