Troubleshooting - Pioneer AVIC-F910BT Service Manual

5

5.6 TROUBLESHOOTING

QQ
3 7 63 1515 0
- FLOWCHART
Key illumination is
NAVI5V is OK?
NAVI3V from the
NAVI unit is OK?
Key illumination is
lighted more than 20
TE
L 13942296513
LCD backlight is OK?
No Display
(White or Gray screen)
NAVI unit failure.
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No Power
NO
lighted?
YES
NO
(No output)
YES
NO
(No output)
YES
NO
seconds?
Key illumination
go off after 20
YES
seconds.
NO
YES
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y
i
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Check the following signal in the
AV unit.
(BSEN/ASEN/ILM, 8 V Power
supply)
Check the Power supply (D/D
converter) block and Control signal
(48pin NAVICON) of the System
u-com in the AV unit.
NAVI unit failure.
(NAVI3V is supplied from NAVI
unit and also NAVI3V is
generated from NAVI5V)
Initial communication error
between NAVI and AV unit.
- Confirm communication line
between 2 unit. (*1)
- Change the NAVI unit
Q Q
3 6 7 1 3
Power supply
block for "LCD Panel
unit" is OK?
YES
LCD Panel unit failure.
u163
.
AVIC-X910BT/XS/UC
7
2 9 9 4 2 8
(*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
1 5 0 5 8 2 9 9 4
NO
LCD unit failure.
m
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
75
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