Subaru Legacy 2005 Service Manual page 4123

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANTENNA CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
antenna. <Ref. to SL-48, Immobilizer
Antenna.>
3) Measure the resistance of antenna circuit.
Connector & terminal
(B351) No. 1 — No. 2:
2 CHECK ANTENNA CIRCUIT.
1) Disconnect the harness connector from
body integrated module.
2) Measure the resistance between harness
connector and chassis ground.
Connector & terminal
(B281) No. 21 — Chassis ground:
3 CHECK ANTENNA CIRCUIT.
Measure the resistance between harness con-
nector and chassis ground.
Connector & terminal
(B281) No. 20 — Chassis ground:
4 CHECK ANTENNA CIRCUIT.
1) Turn the ignition switch to ON. (Engine
OFF)
2) Measure the voltage between harness con-
nector and chassis ground.
Connector & terminal
(B281) No. 21 (+) — Chassis ground (
5 CHECK ANTENNA CIRCUIT.
Measure the voltage between harness connec-
tor and chassis ground.
Connector & terminal
(B281) No. 20 (+) — Chassis ground (
6 CHECK BODY INTEGRATED MODULE
FUNCTION.
1) Turn the ignition switch to OFF.
2) Connect the harness connector to body
integrated module.
3) Insert the key to ignition switch, and mea-
sure the changes in voltage between antenna
harness connectors.
Connector & terminal
(B281) No. 20 (+) — Chassis ground (
Check
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
Is the voltage 0 V?
−
):
Is the voltage 0 V?
−
):
Is the voltage −30 to 30 V?
(Approx. 0.1 second after
inserting the key) Is the voltage
0 V? (Approx. 1 second after
inserting the key)
−
):
IM(diag)-19
IMMOBILIZER (DIAGNOSTICS)
Yes
Go to step 2. Replace the
antenna. <Ref. to
SL-48, Immobi-
lizer Antenna.>
Repair the har- Go to step 3.
ness.
Repair the har- Go to step 4.
ness.
Go to step 5. Repair the har-
ness.
Go to step 6. Repair the har-
ness between
body integrated
module and
antenna, because
there is short cir-
cuit with battery
voltage line or igni-
tion switch "ON"
line.
Go to step 7. Replace the body
integrated module
<Ref. to SL-44,
Body Integrated
Module.> and
replace all the igni-
tion keys (includ-
ing transponder).
Execute the regis-
tration procedure
next. Refer to
"IMMOBILIZER
TEACHING
OPERATION
MANUAL".
No