Diagnosis; Operational Flowchart - Pioneer DVH-335UB/XNRC Service Manual

5

5. DIAGNOSIS

5.1 OPERATIONAL FLOWCHART

Power ON
VDD = 5 V
Pin 14, 60
BSENS
Pin 17
BSENS = L
ASENS
Pin 18
ASENS = L
DSENS
Pin 19
DSENS = L
Starts
communication
with Grille
microcomputer.
SWVDD <- H
Pin 5
Source keys
operative
Source ON
SYSPW <- H
Pin 50
Completes power-on operation.
(After that, proceed to each source operation)
5
6
500 ms
500 ms
In case of the above signal, the communication
with Grille microcomputer may fail.
If the time interval is not 500 msec, the oscillator
may be defective.
DVH-335UB/XNRC
6
7
7
8
A
B
C
D
E
F
23
8