Subaru Legacy III (2000-2003 year). Service manual — part 909
AB-62
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
O: DTC 46
DIAGNOSIS:
• Side airbag harness (LH) is shorted to power supply.
• Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module, and sensor, reconnect each
part and confirm that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the driver's airbag module and passenger's
airbag module connectors for safety reasons.
• When inspecting the side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:
6
7
9
5
10
12
1
2
AIRBAG CONTROL MODULE
AB17
AB19
AB23
AB20
AB19
AB23
AB17
1 2
1
4
2
3
SIDE AIRBAG
SENSOR LH
INFLATOR
(SIDE LH)
3
4
1
2
1 2 3 4 5 6
7 8 9 10 11 12
AB-00300
AB-63
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK SIDE AIRBAG MODULE.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect connector (AB21) from the
seat belt pretensioner (LH). <Ref. to SE-7,
Front Seat.>
3) Disconnect connector (AB20) from (AB19),
and connect connector (1F) in test harness
F to (AB19).
4) Connect airbag resistor to connector (3F) in
test harness F.
5) Connect the battery ground cable and turn
the ignition switch ON.
Does air bag warning light operate prop-
erly?
Operates properly.
Replace front seat
with side airbag
module (LH).
<Ref. to SE-7,
Front Seat.>
2
CHECK SIDE AIRBAG HARNESS (LH).
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect airbag resistor from the test
harness.
3) Disconnect the connector (AB17) from the
airbag control module. <Ref. to AB-17, Air-
bag Control Module.>
4) Connect connector (1I) in test harness I2 to
connector (AB17).
5) Connect the battery ground cable, and turn
the ignition switch ON.
6) Measure the voltage between connector
(3I) in test harness I2 and the chassis
ground.
Connector & terminal
(3I) No. 10 (+) — Chassis ground (
−−−−
):
(3I) No. 12 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1 V
Replace the air-
bag control mod-
ule. <Ref. to AB-
17, Airbag Control
Module.>
Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>
AB-64
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
P: DTC 51
DIAGNOSIS:
• Side airbag sensor (RH) is faulty.
• Side airbag harness (RH) is faulty.
• Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module, and sensor, reconnect each
part and confirm that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the driver's airbag module and passenger's
airbag module connectors for safety reasons.
• When inspecting the side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:
10
9
7
12
2
1
1
2
AIRBAG CONTROL MODULE
AB18
AB24
AB28
AB25
AB24
AB28
AB18
1 2
1
4
2
3
SIDE AIRBAG
SENSOR RH
INFLATOR
(SIDE RH)
3
4
1
2
1 2 3 4 5 6
7 8 9 10 11 12
AB-00299
AB-65
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK SIDE AIRBAG HARNESS (RH).
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect connector (AB26) from the seat
belt pretensioner (RH). <Ref. to SB-7, Front
Seat Belt.>
3) Disconnect connector (AB25) from (AB24).
4) Disconnect connector (AB18) from the air-
bag control module. <Ref. to AB-17, Airbag
Control Module.>
5) Connect connector (1I) in test harness I2 to
the connector (AB18).
6) Disconnect connector (AB28) from the side
airbag sensor (RH), and connect connec-
tor (1G) in test harness G to connector
(AB28).
7) Measure the resistance between connector
(3I) in test harness I2 and connector (3G) in
test harness G.
Connector & terminal
(3I) No. 17 — (3G) No. 2:
(3I) No. 18 — (3G) No. 4:
(3I) No. 19 — (3G) No. 1:
(3I) No. 20 — (3G) No. 5:
Is the measured value less than the speci-
fied value?
10
Ω
Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>
2
CHECK SIDE AIRBAG HARNESS (RH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.
Connector & terminal
(3I) No. 17 — Chassis ground:
(3I) No. 18 — Chassis ground:
(3I) No. 19 — Chassis ground:
(3I) No. 20 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Replace side air-
bag sensor (RH).
<Ref. to AB-18,
Side Airbag Sen-
sor.> When sensor
replacement is not
OK, replace the
airbag control
module. <Ref. to
AB-17, Airbag
Control Module.>
Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>
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