Subaru Legacy 2003 Service Manual page 2300

The POWER indicator light flashes the code corresponding to the faulty part.
The long segment (1.2 sec on) indicates a "ten", and the short segment (0.2 sec on) signifies a "one".
Normal code
DTC 11
DTC 11 and 23
Unit: Seconds
2. WITH SUBARU SELECT MONITOR
Refer to Subaru Select Monitor for information
about how to obtain and understand trouble codes.
<Ref. to AT-21, OPERATION, Subaru Select Mon-
itor.>
READ DIAGNOSTIC TROUBLE CODE (DTC)
0.25
ON
OFF
0.3 0.2
1.2
ON
OFF
0.3 0.2
1.2
ON
OFF
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
1.5
0.3
1.5 1.2
AT-25
0.3 0.2 0.3 0.2 0.3 0.2
1.2
AT-00342