AVIC-X910BT/XS/UC
75
5
6
7
8
5
6
7
8
C
D
F
A
B
E
5.6 TROUBLESHOOTING
No Power
Key illumination is
lighted?
Check the following signal in the
AV unit.
(BSEN/ASEN/ILM, 8 V Power
supply)
Key illumination is
lighted more than 20
seconds?
LCD backlight is OK?
NAVI5V is OK?
Check the Power supply (D/D
converter) block and Control signal
(48pin NAVICON) of the System
u-com in the AV unit.
LCD unit failure.
Power supply
block for "LCD Panel
unit" is OK?
LCD Panel unit failure.
NAVI unit failure.
NAVI3V from the
NAVI unit is OK?
NAVI unit failure.
(NAVI3V is supplied from NAVI
unit and also NAVI3V is
generated from NAVI5V)
NO
YES
NO
YES
NO
(No output)
YES
NO
Key illumination
go off after 20
seconds.
Initial communication error
between NAVI and AV unit.
- Confirm communication line
between 2 unit. (*1)
- Change the NAVI unit
(*1)
Normal operation after ACC ON
- RESETB: High
- OFFINFO: L -> H
- OFFANS: H -> L
- CTOSYS: UART
- SYSTOC: UART
- CPUWDT: L
- BATFAULT: L
Notes:
All siganl mentioned above are control
key signal from System u-com (AV
unit) to NAVI unit.
The "H" voltage is different depends on
the location.
- Port of system u-com: 5 V
- Connector of AV unit: 3 V
YES
No Display
(White or Gray screen)
YES
NO
(No output)
NO
YES
-
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4
2
9
8
TEL 13942296513
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9
2
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4
2
9
8
0
5
1
5
1
3
6
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3
Q
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
