Diagnosis; Operational Flowchart - Pioneer DEH-23UB/XSUC Service Manual

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5. DIAGNOSIS

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3 7 63 1515 0

5.1 OPERATIONAL FLOWCHART

A
Power ON
Vcc = 1.2 V
PVcc = 3.3 V
BSENS
B
ASENS
C
DSENS
TE
L 13942296513
communication
with Grille
microcomputer.
D
SWVDD <- H
Source keys
operative
E
Source ON
SYSPW <- H
www
F
Completes power-on operation.
(After that, proceed to each source operation)
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Pin 5
Pin 1
Pin 141
BSENS = L
Pin 143
ASENS = L
Pin 140
DSENS = L
Starts
Pin 128
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.
Pin 7
x ao
y
. i
DEH-23UB/XSUC
2
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3
8
Q Q
3 6 7 1 3
300 ms
300 ms
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.
3
4
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
m
co
4
9 9
2 8 9 9