Subaru 2009 IMPREZA, Service Manual

Page: 3327 / 3619

IM(diag)-17
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
5 CHECK ANTENNA CIRCUIT.
Measure the voltage between harness connec-
tor and chassis ground.
Connector & terminal
(B280) No. 25 (+) — Chassis ground (–):
Is the voltage 0 V? 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.
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 (–):
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) 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”.
7 CHECK IGNITION KEY (TRANSPONDER).
1) Remove the key from ignition switch.
2) Start the engine using other key which is
already registered.
Does the engine start? Replace the igni-
tion key (including
the transponder).
Execute the regis-
tration procedure
next. Refer to the
“PC application
help for Subaru
Select Monitor”. 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”.
Step Check Yes No