Subaru LEGACY 2004 Service Manual page 708

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
Step
7 CHECK IGNITION KEY (TRANSPONDER).
1) Remove the key from ignition switch.
2) Start the engine using other keys that have
undergone the teaching operation, furnished
with vehicle.
Check
Does the engine start?
IM(diag)-20
Yes
Replace all the Replace the body
ignition keys integrated unit
(including tran- <Ref. to SL-46,
sponder). Execute Body Integrated
the registration Unit.> and replace
procedure next. the all ignition keys
Refer to "REGIS- (including tran-
TRATION MAN- sponder). Execute
UAL FOR the registration
IMMOBILIZER". procedure next.
Refer to "REGIS-
TRATION MAN-
UAL FOR
IMMOBILIZER".
No