Subaru B9 TRIBECA WX 2007, Manual

Page: 546 / 861

IM(diag)-13
Diagnostics Chart for Security Indicator Light
IMMOBILIZER (DIAGNOSTICS)
Step Check Yes No
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 (–):
Is the voltage 10 V or more? Go to step 2 . Check the harness
for open or short
circuit between key
warning switch and
fuse.
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:
Is the resistance less than 1
Ω
? Go to step 3 . Replace the key
warning switch.
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:
Is the resistance 1 M
Ω
or
more?
Go to step 4 . Replace the key
warning switch.
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 — (B281) No. 7:
Is the resistance less than 10
Ω
?
Replace the body
integrated unit
<Ref. to SL-51,
Body Integrated
Unit.> and replace
all the ignition keys
(including tran-
sponder). Execute
the registration
procedure next.
Refer to the “REG-
ISTRATION MAN-
UAL FOR
IMMOBILIZER”. Repair the harness
between key warn-
ing switch and
body integrated
unit.
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