Subaru Legacy III (2000-2003 year). Service manual — part 911
AB-70
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
U: DTC 61
DIAGNOSIS:
• Seat belt pretensioner (RH) circuit is open, shorted or shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness 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 side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:
6
5
PRETENSIONER RH
1
2
AIRBAG CONTROL MODULE
AB18
AB26
AB26
AB18
1 2
1 2 3 4 5 6
7 8 9 10 11 12
AB-00301
AB-71
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK SEAT BELT PRETENSIONER.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect the connector (AB26) from the
seat belt pretensioner (RH). <Ref. to SB-7,
Front Seat Belt.>
3) Connect the connector (1F) in test harness
F to (AB26).
4) Connect the airbag resistor to connector
(3F) in test harness F.
5) Connect the battery ground cable and turn
the ignition switch ON.
Does the airbag warning light operate prop-
erly?
Operates properly.
Replace seat belt
pretensioner (RH).
<Ref. to SB-7,
Front Seat Belt.>
2
CHECK SIDE AIRBAG HARNESS (RH).
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect the airbag resistor from the test
harness.
3) Disconnect the connector (AB25) from
(AB24).
4) Disconnect the connectors (AB17) and
(AB18) from the airbag control module.
<Ref. to AB-17, Airbag Control Module.>
5) Connect the connector (1I) in test harness
I2 to connector (AB18).
6) Measure the resistance between connector
(3I) in test harness I2 and connector (3F) in
test harness F.
Connector & terminal
(3I) No. 8 — (3F) No. 4:
(3I) No. 6 — (3F) No. 3:
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.>
3
CHECK SIDE AIRBAG HARNESS (RH).
Measure the resistance of the connector (3I) in
test harness I2.
Connector & terminal
(3I) No. 6 — No. 8:
Does the measured value exceed the specified
value?
1 M
Ω
Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>
4
CHECK SIDE AIRBAG HARNESS (RH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.
Connector & terminal
(3I) No. 6 — Chassis ground:
(3I) No. 8 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
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.>
AB-72
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
V: DTC 62
DIAGNOSIS:
• Seat belt pretensioner (LH) circuit is open, shorted or shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness 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 side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:
AB-00302
1
2
PRETENSIONER LH
1
2
AIRBAG CONTROL MODULE
AB17
AB21
AB21
AB17
1 2
1 2 3 4 5 6
7 8 9 10 11 12
AB-73
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK SEAT BELT PRETENSIONER.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect the connector (AB21) from the
seatbelt pretensioner (LH). <Ref. to SB-7,
Front Seat Belt.>
3) Connect the connector (1F) in test harness
F to (AB21).
4) Connect the airbag resistor to the connec-
tor (3F) in test harness F.
5) Connect the battery ground cable and turn
the ignition switch ON.
Does the airbag warning light operate prop-
erly?
Operates properly.
Replace seat belt
pretensioner (LH).
<Ref. to SB-7,
Front Seat Belt.>
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 the airbag resistor from the test
harness.
3) Disconnect the connector (AB20) from
(AB19).
4) Disconnect the connectors (AB17) and
(AB18) from the airbag control module.
<Ref. to AB-17, Airbag Control Module.>
5) Connect the connector (1I) in test harness
I2 to the connector (AB17).
6) Measure the resistance between connector
(3I) in test harness I2 and the connector
(3F) in test harness F.
Connector & terminal
(3I) No. 11 — (3F) No. 4:
(3I) No. 13 — (3F) No. 3:
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.>
3
CHECK SIDE AIRBAG HARNESS (LH).
Measure the resistance of the connector (3I) in
test harness I2.
Connector & terminal
(3I) No. 11 — No. 13:
Does the measured value exceed the specified
value?
1 M
Ω
Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>
4
CHECK SIDE AIRBAG HARNESS (LH).
Measure the resistance between the connec-
tor (3I) in test harness I2 and the chassis
ground.
Connector & terminal
(3I) No. 11 — Chassis ground:
(3I) No. 13 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
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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