Troubleshooting - Pioneer AVIC-F900BT/XS/RE Service Manual

5

5.6 TROUBLESHOOTING

- FLOWCHART
No Power
Key illimination is
lighted?
YES
NAVI5V is OK?
YES
NAVI3V from the
NAVI unit is OK?
YES
Key illumination is
lighted more than 20
seconds?
YES
LCD backlight is OK?
YES
No Display
(White or Gray screen)
NAVI unit failure.
5
6
Check the following signal in the
NO
AV unit.
(BSEN/ASEN/ILM, 8 V Power
supply)
Check the Power supply (D/D
NO
converter) block and Control signal
(48pin NAVICON) of the System
(No output)
u-com in the AV unit.
NAVI unit failure.
(NAVI3V is supplied from NAVI
NO
unit and also NAVI3V is
(No output) generated from NAVI5V)
Initial communication error
between NAVI and AV unit.
NO
- Confirm communication line
between 2 unit. (*1)
Key illimination
- Change the NAVI unit
go off after 20
seconds.
Power supply
NO
block for "LCD Panel
unit" is OK?
YES
LCD Panel unit failure.
AVIC-F900BT/XS/EW5
6
7
(*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
NO
LCD unit failure.
7
8
A
B
C
D
E
F
65
8