Diagnosis; Operational Flowchart - Pioneer DEH-4000UB/XS/EW5 Service Manual

5

5. DIAGNOSIS

5.1 OPERATIONAL FLOWCHART

Power ON
Vcc = 5 V
Pin 16
bsens
Pin 18
bsens = L
asens
Pin 75
asens = L
DSENS
Pin 19
DSENS = L
ASENBO H
Pin 40
SWVDD H
Pin 49
Source keys
operative
Source ON
SYSPW H
Pin 48
Completes power-on operation.(After that, proceed to each source operation.)
5
6
Starts communication with Grille microcomputer.
300 ms
300 ms
In case of the above signal, the communication
with Grille microcomputer may fail.
If the time interval is not 300 msec, the oscillator
may be defective.
DEH-4000UB/XS/EW5
6
7
7
8
A
B
C
D
E
F
23
8