Subaru Legacy 2005 Service Manual page 4126

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
Step
1 CHECK BODY INTEGRATED MODULE
POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
body integrated module.
3) Measure the voltage between body inte-
grated module harness connector terminal and
chassis ground.
Connector & terminal
(B280) No. 7 (+) — Chassis ground (
(B281) No. 2 (+) — Chassis ground (
2 CHECK BODY INTEGRATED MODULE
POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF)
2) Measure the voltage between body inte-
grated module harness connector terminal and
chassis ground.
Connector & terminal
(i84) No. 1 (+) — Chassis ground (
3 CHECK BODY INTEGRATED MODULE
GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between body inte-
grated module harness connector terminal and
chassis ground.
Connector & terminal
(B280) No. 22 — Chassis ground:
(B281) No. 8, No. 9 — Chassis ground:
4 CHECK HARNESS BETWEEN BODY INTE-
GRATED MODULE AND ECM.
1) Disconnect the harness connector from
body integrated module and ECM.
2) Measure the resistance between body inte-
grated module harness connector terminal and
ECM connector terminal.
Connector & terminal
2.0 L non-turbo model and 2.5 L KS, KA
model
(B280) No. 18 — (B135) No. 25:
2.0 L turbo model, 3.0 L model and 2.5 L
EC, K4, EK model
(B280) No. 18 — (B137) No. 19:
5 CHECK HARNESS BETWEEN BODY INTE-
GRATED MODULE AND ECM.
Measure the resistance between body inte-
grated module harness connector terminal and
ECM harness connector terminal.
Connector & terminal
2.0 L non-turbo model and 2.5 L KS, KA
model
(B280) No. 28 — (B135) No. 33:
2.0 L turbo model, 3.0 L model and 2.5 L
EC, K4, EK model
(B280) No. 28 — (B137) No. 27:
Check
Is the voltage more than 10 V? Go to step 2.
−
):
−
):
Is the voltage more than 10 V? Go to step 3.
−
):
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
IM(diag)-22
Yes
Check the harness
for open or short
circuit between
body integrated
module and fuse.
Check the harness
for open or short
circuit between
body integrated
module and igni-
tion switch.
Go to step 4. Repair the open
circuit of body inte-
grated module
ground circuit.
Go to step 5. Repair the open
circuit of harness
between body inte-
grated module and
ECM.
Go to step 6. Repair the open
circuit of harness
between body inte-
grated module and
ECM.
No