Subaru Legacy 2004 Service Manual page 2563

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
AE:DTC P0957 BACKUP LIGHT RELAY CIRCUIT LOW
DTC DETECTING CONDITION:
Short circuit of back-up light relay output circuit
TROUBLE SYMPTOM:
Back-up light does not illuminate in "R" range.
WIRING DIAGRAM:
SBF-1 SBF-9
E
IGNITION
RELAY
BACKUP LIGHT CIRCUIT
B55 TCM
5AT(diag)-104
B356
B55
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24
B356
1 2
3
4
AT-01631