Diagnosis; Operational Flowchart - Pioneer DEH-20UB Service Manual

5

5. DIAGNOSIS

5.1 OPERATIONAL FLOWCHART

Power ON
VDD = 3.3 V
Pin 8
BSENS
Pin 36
BSENS = L
ASENS
Pin 35
ASENS = L
Starts
communication
with Grille
microcomputer.
SWVDD <- H
Pin 1
Source keys
operative
Source ON
SYSPW <- H
Pin 15
Completes power-on operation.
(After that, proceed to each source operation)
5
6
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-20UB/XS/UC
6
7
7
8
A
B
C
D
E
F
21
8