Subaru 2009 IMPREZA Service Manual page 3323

Diagnostics Chart for Security Indicator Light
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 in the ignition switch.
(OFF or ACC)
2) Measure the resistance between key warn-
ing switch connector 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 connector 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 terminal.
Connector & terminal
(B350) No. 4 — (B279) No. 2:
Check
Is the voltage 10 V or more?
Is the resistance less than 1 ? Go to step 3.
Is the resistance 1 M or
more?
Is the resistance less than 10 ? Replace the body
IM(diag)-13
IMMOBILIZER (DIAGNOSTICS)
Yes No
Go to step 2. Check the harness
for an open or
short between the
key warning switch
and fuse.
Replace the key
warning switch.
Go to step 4. Replace the key
warning switch.
Repair the harness
integrated unit between key warn-
<Ref. to SL-50, ing switch and
Body Integrated body integrated
Unit.> Replace all unit.
ignition keys
(including the tran-
sponder). Execute
the registration
procedure next.
Refer to the "PC
application help for
Subaru Select
Monitor".