Lexus RX300 (MCU15). Service manual — part 374
DI27W–07
Vehicle Brought to Workshop
Customer Problem Analysis
Check and Clear DTC (Pre check)
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom Confirmation
Symptom
does not occur
Symptom
occurs
DTC Check
DTC Chart
Malfunction code
Problem Symptoms Table
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
6
7
8
9
10
P. DI–727
P. DI–728
P. IN–22
P. DI–756
P. DI–728
P. DI–745
P. DI–752
Terminal of ECU
Symptom Simulation
DI–726
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
LEXUS NAVIGATION SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
The ECU of this system is connected to the multiplex communication system. Therefore, before starting trou-
bleshooting, make sure to check that there is no trouble in the multiplex communication system.
DI27X–06
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
DI–727
LEXUS RX300 (RM785E)
CUSTOMER PROBLEM ANALYSIS CHECK
NAVIGATION SYSTEM Check Sheet
Inspector’s name:
Customer’s Name
Date of Vehicle
Registration No.
Registration Year
Frame No.
Odometer Reading
/ /
km
Mile
Frequency Problem Occurs
/ /
j
Constant j Intermittent ( Times a day)
Brought in
j
Cursor movement is defective.
Date Problem First Occurred
Problem
Symptom
j
Cursor does not move.
j
GPS mark does not appear.
j
Map is not displayed.
j
Screen is dark.
j
Screen is white.
j
Color is not uniform.
j
Screen is in disorder.
j
Can not operate with panel switches.
j
Can not operate with touch switches.
j
Others ( )
j
Others ( )
j
Others ( )
Navigation
malfunction
Display
malfunction
Control
Switch
malfunction
Navigation ECU
Multi Display
Radio receiver assembly
DTC Check
Parts name
1st time malfunction code.
2nd time malfunction code.
DI7OR–03
I17101
Navigation system normal operation
to 2. SYSTEM CHECK MODE SCREEN
to 4. DISPLAY
CHECK MODE SCREEN
to 3. NAVIGATION
CHECK MODE SCREEN
Diagnosis start–up. (refer to next page)
HINT:
When Diagnosis Sys-
tem mode is started,
system check is per-
formed at first and the
check result is dis-
played.
DI–728
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
PRE–CHECK
1.
DIAGNOSIS SYSTEM MODE
HINT:
Diagnosis System Mode is operated as follows.
I19230
LHD:
RHD:
I17110
Concealed
touch
switch
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
DI–729
LEXUS RX300 (RM785E)
(a)
DIAGNOSIS START–UP
To start the diagnosis menu, there are 2 ways: using a
diagnosis check wire and using a switch.
(b)
START–UP BY SWITCH OPERATION
(1)
Vehicle speed is 0 km/h (0 mph).
(2)
Parking brake switch is pressed.
(3)
Press the Display switch to display the Screen Ad-
justment screen.
(4)
Repeatedly touch the upper and lower bottom parts
of the left end of the screen 3 times.
(c)
FINISHING DIAGNOSIS SYSTEM MODE
Turn the ignition switch from ACC to OFF to finish the
mode. If it is started by switch operation.
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