Subaru forester 2004 Service Manual page 13

Diagnostics Chart for Immobilizer Warning Light
Step
1 CHECK IMMOBILIZER WARNING LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
IMM ECM.
3) Connect a resistor (750 Ω) between IMM
ECM harness connector terminal No. 9 and
chassis ground.
2 CHECK IMM ECM GROUND CIRCUIT.
Measure the resistance between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 2, No. 3 — Chassis ground:
3 CHECK IMM ECM IGNITION CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 12 (+) — Chassis ground(
4 CHECK IMM ECM POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 10, No. 11 (+) — Chassis
−
ground( ):
5 CHECK COMBINATION METER CIRCUIT.
1) Remove the combination meter. <Ref. to
IDI-10, Combination Meter Assembly.>
2) Measure the voltage between combination
meter harness connector terminal and chassis
ground.
Connector & terminal
(i10) No. 8 (+) — Chassis ground (
6 CHECK COMBINATION METER CIRCUIT.
Measure the resistance between IMM ECM
harness connector terminal and combination
meter harness connector terminal.
Connector & terminal
LHD model
(B141) No. 9 — (i12) No. 4:
RHD model
(B141) No. 9 — (i11) No. 5:
Check
Does the immobilizer warning
light illuminate?
Is the resistance less than 10
Ω?
Is the voltage more than 10 V? Go to step 4.
−
):
Is the voltage more than 10 V? Replace the IMM
Is the voltage more than 10 V? Go to step 6.
−
):
Is the resistance less than 10
Ω?
IM-11
IMMOBILIZER (DIAGNOSTIC)
Yes
Go to step 2. Go to step 5.
Go to step 3. Repair the open
circuit of IMMECM
ground circuit.
Check the harness
for open or short
between IMM
ECM and ignition
switch.
Check the harness
ECM <Ref. to SL- for open or short
37, Immobilizer between IMM
Control Module.> ECM and fuse.
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).
Check the harness
for open or short
between combina-
tion meter and
fuse.
Faulty LED. Repair the har-
Replace the com- ness or connector.
bination meter
printed circuit.
<Ref. to IDI-11,
DISASSEMBLY,
Combination
Meter Assembly.>
No