Lexus RX300 (MCU15). Service manual — part 381
I15499
N2
N3
DI–754
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
NAVIGATION ECU
Symbols
Condition
STD Voltage (V)
Problem symptom when
open circuit is detected.
Symbols
(Terminals NO. )
Condition
STD Voltage (V)
Problem symptom when
short circuit is detected.
AUI+ ↔ GND
(N2–1 ↔ N2–17)
Radio switch ON
5 – 7 V
Driver’s side speaker does not
sound.
AUO+ ↔ GND
(N2–2 ↔ N2–17)
Radio switch ON
5 – 7 V
Driver’s side speaker does not
sound.
SPD ↔ GND
(N2–5 ↔ N2–17)
Ignition switch ON and driving
wheel rotated slowly
Repeatedly changes from below 1
to 9 V
Navigation operation is available
during, or a cursor on present site
does not move.
+B ↔ GND
(N2–9 ↔ N2–17)
Constant
10 – 14 V
The set route can not be memo-
rized. (The route disappears by
turning the ignition switch OFF.)
Fuse is blown.
AUI– ↔ GND
(N2–10 ↔ N2–17)
Radio switch ON
5 – 7 V
Driver’s side speaker does not
sound.
AUO– ↔ GND
(N2–11 ↔ N2–17)
Radio switch ON
5 – 7 V
Driver’s side speaker does not
sound.
REV ↔ GND
(N2–14 ↔ N2–17)
A/T shift position R
5 V
The direction of advance of the ve-
hicle is different from that of the
cursor.
GND ↔ Body ground
(N2–17 ↔ Body ground)
Constant
Below 1 V
Audio system is normal.
ACC ↔ GND
(N2–18 ↔ N2–17)
Ignition switch ACC or ON
10 – 14 V
Audio system does not sound.
VR ↔ VG
(N3–1 ↔ N3–6)
Constant
Continuity
Screen noise or other types of
noise occur.
(N3 1 ↔ N3 6)
Navigation system does not op-
eration.
R ↔ VG
(N3–2 ↔ N3–6)
Diagnosis display check screen is
white (Using an oscilloscope)
0.7 V ± 0.1 V*1
Screen color turns to blue.
I15531
GND
Oscilloscope
*1: wave1
D Measure terminal: SYNC ↔ GND1
D Measure set: 500 mV/DIV 10 µs/DIV
D Condition: Navigation display is displayed
I15532
GND
*2: wave2
D Measure terminal: R, G, B ↔ GND1
D Measure set: 200 mV/DIV 10 µs/DIV
D Condition: Navigation map is switched
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
DI–755
LEXUS RX300 (RM785E)
+B ↔ GND
(N3–3 ↔ N2–17)
Constant
10 – 14 V
The set route can not be memo-
rized. (The route disappears by
turning the ignition switch OFF.)
Fuse is blown.
B ↔ VG
(N3–3 ↔ N3–6)
Diagnosis display check screen is
white (Using an oscilloscope)
0.7 ± 0.1 V*2
Screen color turns to yellow.
TX1+ ↔ GND
(N3–5 ↔ N2–17)
Ignition switch ACC or ON
2 – 3 V
Navigation system does not oper-
ate.
VG ↔ GND
(N3–6 ↔ N2–17)
Constant
Continuity
Screen noise or other types of
noise occur.
(N3 6 ↔ N2 17)
Navigation system does not op-
eration.
G ↔ VG
(N3–7 ↔ N3–6)
Diagnosis display check screen is
white (Using an oscilloscope)
0.7 ± 0.1 V*2
Screen color turns to red–purple.
SYNC ↔ VG
(N3–8 ↔ N3–6)
Display ON
(Using an oscilloscope)
0.5 - 1.3 V*1
Screen is in disorder.
TX1– ↔ GND
(N3–10 ↔ N2–17)
Ignition switch ACC or ON
2 – 3 V
Navigation system does not oper-
ate.
DI282–07
DI–756
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
PROBLEM SYMPTOMS TABLE
Flow chart No.
Symptom
See page
1
Black screen (Nothing displayed)
DI–757
2
No sound with POWER switch pressed. (”Audio OFF” on audio screen)
DI–758
3
No navigation screen displayed when ”MAP”, ”Menu”, or ”DEST” switch pressed.
(Screen cannot be switched.)
DI–759
4
No corresponding screen displayed when ”Audio” or ”Information” switch pressed.
DI–762
5
No navigation displayed, ”Audio OFF” on audio screen and no audio sound.
DI–763
6
Screen cannot be dimmed in night time.
DI–765
7
Navigation screen not stabilized. (Synchronous error)
DI–767
8
Color on navigation screen is unusual (RGB signal error)
DI–768
9
Black screen appears when ”MAP”, ”Menu” or ”DEST” switch pressed.
DI–770
10
Sound of radio, cassette tape or CD only cannot be heard from speaker.
DI–771
11
No sound (radio, cassette tape, CD) can be heard from driver side door speaker
only.
DI–772
12
Map DISC cannot be inserted.
DI–774
13
MAP screen display does not appear.
(Disc Caution screen does not change.)
DI–776
14
Map is displayed in white or blue screen. (Switches and vehicle position mark is
displayed.)
DI–777
15
Touch switch does not function. (Navigation screen only)
DI–778
16
The screen cannot change to the night mode color.
DI–780
17
Vehicle position is deviated from correct point badly.
DI–781
18
GPS mark does not appear.
DI–784
19
No voice navigation.
DI–786
20
Vehicle position rotates without control. (Map rotates without control)
DI–787
21
Driving direction is opposite to moving direction of vehicle position mark.
DI–789
22
Radio reception poor.
DI–790
23
Cassette tape cannot be inserted.
DI–791
24
Cassette tape cannot be eject.
DI–792
25
CD cannot be inserted.
DI–794
26
CD cannot be eject.
DI–795
27
No AM. FM or CD screen is displayed.
DI–796
DI7OU–03
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DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
DI–757
LEXUS RX300 (RM785E)
CIRCUIT INSPECTION
1. Black screen (Nothing displayed)
INSPECTION PROCEDURE
1
Check the RADIO No. 2 and DOME fuse.
NG
Replace the fuse.
OK
2
Check multi display.
PREPARATION:
Disconnect the multi display connector.
CHECK:
Check voltage terminals +B.
OK:
+B: 10 – 14 V
CHECK:
Check voltage terminal ACC when turn ignition switch ACC or ON position.
OK:
ACC: 10 – 14 V
CHECK:
Check continuity terminal GND.
OK:
GND: Continuity
NG
Replace or repair wire harness or connector.
OK
Replace the multi display.
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