Subaru Legacy 2004 Service Manual page 4062

Diagnostics Chart for Immobilizer Indicator Light
IMMOBILIZER (DIAGNOSTICS)
Step
1 CHECK POWER SUPPLY CIRCUIT.
1) Disconnect the harness connector from key
warning switch.
2) Turn the ignition switch to "ACC" or "LOCK"
(with key inserted).
3) Measure the voltage between key warning
switch harness connector terminal and chassis
ground.
Connector & terminal
(B350) No. 3 (+) — Chassis ground (
2 CHECK KEY WARNING SWITCH.
1) Insert the ignition key to ignition switch.
(OFF or ACC)
2) Measure the resistance between key warn-
ing switch terminals.
Connector & terminal
No. 3 — No. 4:
3 CHECK KEY WARNING SWITCH.
1) Remove the ignition key from ignition
switch.
2) Measure the resistance between key warn-
ing switch terminals.
Connector & terminal
No. 3 — No. 4:
4 CHECK HARNESS BETWEEN KEY WARN-
ING SWITCH AND BODY INTEGRATED
UNIT.
1) Disconnect the harness connector from key
warning switch.
2) Disconnect the harness connector from
body integrated unit.
3) Measure the resistance between key warn-
ing switch harness connector terminal and
body integrated unit harness connector termi-
nal.
Connector & terminal
(B350) No. 4 — (B281) No. 7:
Check
Is the voltage more than 10 V? Go to step 2.
#
):
Is the resistance less than 1
"?
Is the resistance more than 1
M"?
Is the resistance less than 10
"?
IM(diag)-14
Yes
Check the harness
for open or short
circuit between
key warning switch
and fuse.
Go to step 3. Replace the key
warning switch.
Go to step 4. Replace the key
warning switch.
Replace the body Repair the har-
integrated unit ness between key
<Ref. to SL-46, warning switch
Body Integrated and body inte-
Unit.> and replace grated unit.
the all ignition keys
(including tran-
sponder). Execute
the registration
procedure next.
Refer to "REGIS-
TRATION MAN-
UAL FOR
IMMOBILIZER".
No