Subaru LEGACY 2004 Service Manual page 793

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
X: DTC B0500 KEYLESS UART COM. MALFUNCTION
DTC DETECTING CONDITION:
UART between keyless control unit and body integrated unit is open or shorted, connector is not connected
securely, the terminal has poor caulking.
TROUBLE SYMPTOM:
Door lock does not operate with keyless.
WIRING DIAGRAM:
i96
1 2 3 4
5 6 7 8
REF.TO POWER SUPPLY ROUTING
M/B FUSE No.28
A: i84
A9 YG
INTEGRATED
UNIT
A:
1 2 3 4
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29
LAN(diag)-77
FB-10
(P)
i83
ILLMINATION & BACK-UP
JOINT CONNECTOR
i82
KEYLESS ENTRY
CONTROL MODULE
LR 4
YG 3
7
BY
i96
GROUND JOINT
CONNECTOR
i97
E
GB-3
i84
5 6 7 8
30 31 32 33 34 35
LAN SYSTEM (DIAGNOSTICS)
i97
i82
i83
1 2 3 4 5 6
7 8 9 10 11 12
LAN00039