Subaru LEGACY 2004 Service Manual page 754

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
F: DTC B0103 IGNITION POWER FAILURE
DTC DETECTING CONDITION:
IGN power supply circuit is open or shorted.
TROUBLE SYMPTOM:
Symptom that illuminating engine malfunction indicator light, "Er HC" high speed CAN error display may be
occurred.
WIRING DIAGRAM:
BATTERY
MAIN SBF-11
E
A:
B:
C:
B: B52
i84
B280
MICRO COMPUTER
B281
E E
REF.TO GND-03 REF.TO GND-02
LAN(diag)-38
IGNITION SWITCH
OFF ACC ON
W 1 B
Y 2 ACC
G 4 IG
B72
A: i5
BODY INTEGRATED UNIT
A: i84
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31 32 33 34 35
B: B280
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
C: B281
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16 17 18 19
22 23 24 25 26 27 28
20 21
B: B52
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
A: i5
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
B72
1 2 3
4 5 6
LAN00023