Subaru 2009 IMPREZA Service Manual page 3327

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
5 CHECK ANTENNA CIRCUIT.
Measure the voltage between harness connec-
tor and chassis ground.
Connector & terminal
(B280) No. 25 (+) — Chassis ground (–):
6 CHECK BODY INTEGRATED UNIT FUNC-
TION.
1) Turn the ignition switch to OFF.
2) Connect the harness connector to body
integrated unit.
3) Insert the key into the ignition switch, then
measure changes in voltage between the
antenna harness connectors.
Connector & terminal
(B280) No. 25 (+) — No. 26 (–):
7 CHECK IGNITION KEY (TRANSPONDER).
1) Remove the key from ignition switch.
2) Start the engine using other key which is
already registered.
Check
Is the voltage 0 V?
Is the voltage –30 — 30 V?
(Approx. 0.1 second after
inserting the key) Is the voltage
0 V? (Approx. 1 second after
inserting the key)
Does the engine start?
IM(diag)-17
IMMOBILIZER (DIAGNOSTICS)
Yes No
Go to step 6. Because the bat-
tery voltage or igni-
tion switch "ON"
circuit is shorted,
repair the harness
between the body
integrated unit and
antenna.
Go to step 7. Replace the body
integrated unit
<Ref. to SL-50,
Body Integrated
Unit.> Replace all
ignition keys
(including the tran-
sponder). Execute
the registration
procedure next.
Refer to the "PC
application help for
Subaru Select
Monitor".
Replace the igni- Replace the body
tion key (including integrated unit
the transponder). <Ref. to SL-50,
Execute the regis- Body Integrated
tration procedure Unit.> Replace all
next. Refer to the ignition keys
"PC application (including the tran-
help for Subaru sponder). Execute
Select Monitor". the registration
procedure next.
Refer to the "PC
application help for
Subaru Select
Monitor".