2004 SUBARU FORESTER airbag off

AB-73
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SIDE AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB11) from side
airbag module (RH), and connect the connec-
tor (1F) in test harness F to (AB11).
3) Connect the airbag resistor to connector
(3F) in test harness F.
4) Connect the battery ground cable, and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the front
seat with side air-
bag module (RH).
Front Seat.>Go to step 2.
2 CHECK SIDE AIRBAG HARNESS (RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB26) from the
seat belt pretensioner (RH). Front Seat Belt.>
3) For the vehicle with lap seat belt preten-
sioner, disconnect the connector (AB25) from
lap pretensioner.
4) Disconnect the airbag resistor from test
harness F.
5) Disconnect the connector (AB8) from air
bag control module. Control Module.>
6) Connect the connector (1R) in test harness
R to connector (AB8).
7) Measure the resistance between connector
(3R) in test harness R and connector (3F) in
test harness F.
Connector & terminal
(3R) No. 18 — (3F) No. 3:
(3R) No. 20 — (3F) No. 4: Is the resistance less than 10
Ω?Go to step 3.Replace the side
airbag harness
with body harness.
3 CHECK SIDE AIRBAG HARNESS (RH).
Measure the resistance of the connector (3R)
in test harness R.
Connector & terminal
(3R) No. 18 — (3R) No. 20: Is the resistance more than 1
MΩ?Go to step 4.Replace the side
airbag harness
with body harness.
4 CHECK SIDE AIRBAG HARNESS (RH).
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 18 — Chassis ground:
(3R) No. 20 — Chassis ground: Is the resistance more than 1
MΩ?Replace the airbag
control module.
Airbag Control
Module.>Replace the side
airbag harness
with body harness.

AB-74
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
M: DTC 42
DIAGNOSIS:
 Side airbag harness (LH) is faulty.
 Side airbag module (LH) is faulty.
 Airbag control module is faulty.
CAUTION:
 Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from battery, and wait more than 20 seconds before starting to work.
 After replacing the airbag module, seat belt pretensioner, roll connector, control module or sensor,
reconnect each part and confirm that the airbag 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:
AB-00628
AIRBAG CONTROL MODULEAB7
SIDE AIRBAG
SENSOR LH
INFLATOR
(SIDE LH)
AB1012
6 5AB9
12 10
9 7
3
4
1
2
AB10
3412
AB9
12
AB7
123456
789101112

AB-75
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SIDE AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB9) from side
airbag module (LH), and connect the connec-
tor (1F) in test harness F to (AB9).
3) Connect the airbag resistor to connector
(3F) in test harness F.
4) Connect the battery ground cable, and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the front
seat with side air-
bag module (LH).
Front Seat.>Go to step 2.
2 CHECK SIDE AIRBAG HARNESS (LH).
1) Turn ignition switch to OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Disconnect the connector (AB19) from the
seat belt pretensioner (LH). Front Seat Belt.>
3) Disconnect the airbag resistor from the test
harness.
4) Disconnect the connector (AB7) from the
airbag control module. Control Module.>
5) Connect the connector (1R) in test harness
R to connector (AB7).
6) Measure the resistance between connector
(3R) in test harness R and connector (3F) in
test harness F.
Connector & terminal
(3R) No. 12 — (3F) No. 4:
(3R) No. 10 — (3F) No. 3: Is the resistance less than 10
Ω?Go to step 3.Replace the side
airbag harness
with body harness.
3 CHECK SIDE AIRBAG HARNESS (LH).
Measure the resistance of the connector (3R)
in test harness R.
Connector & terminal
(3R) No. 12 — (3R) No. 10: Is the resistance more than 1
MΩ?Go to step 4.Replace the side
airbag harness
with body harness.
4 CHECK SIDE AIRBAG HARNESS (LH).
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 10 — Chassis ground:
(3R) No. 12 — Chassis ground: Is the resistance more than 1
MΩ?Replace the airbag
control module.
Airbag Control
Module.>Replace the side
airbag harness
with body harness.

AB-76
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
N: DTC 45
DIAGNOSIS:
 Side airbag harness (RH) is shorted to power supply.
 Side airbag module (RH) is faulty.
 Airbag control module is faulty.
CAUTION:
 Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from battery, and wait more than 20 seconds before starting to work.
 After replacing the airbag module, seat belt pretensioner, roll connector, control module or sensor,
reconnect each part and confirm that the airbag 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:
AB-00627
AIRBAG CONTROL MODULEAB8
SIDE AIRBAG
SENSOR RH
INFLATOR
(SIDE RH)
AB111 2
12AB12
12
109
7
3
4
1
2
AB8
123456
789101112
AB12
3412
AB11
12

AB-77
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SIDE AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB11) from side
airbag module (RH), and connect the connec-
tor (1F) in test harness F to (AB11).
3) Connect the airbag resistor to connector
(3F) in test harness F.
4) Connect the battery ground cable, and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the front
seat with side air-
bag module (RH).
Front Seat.>Go to step 2.
2 CHECK SIDE AIRBAG HARNESS (RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB20) from the
seat belt pretensioner (RH). Front Seat Belt.>
3) For the vehicle with lap seat belt preten-
sioner, disconnect the connector (AB25) from
lap pretensioner.
4) Disconnect the airbag resistor from the test
harness.
5) Disconnect the connector (AB8) from the
airbag control module. Control Module.>
6) Connect the connector (1R) in test harness
R to connector (AB8).
7) Connect the battery ground cable, and turn
the ignition switch to ON.
8) Measure the voltage between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 18 (+) — Chassis ground (
−):
(3R) No. 20 (+) — Chassis ground (
−): Is the voltage less than 1 V? Replace the airbag
control module.
Airbag Control
Module.>Replace the side
airbag harness
with body harness.

AB-78
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
O: DTC 46
DIAGNOSIS:
 Side airbag harness (LH) is shorted to power supply.
 Side airbag module (LH) is faulty.
 Airbag control module is faulty.
CAUTION:
 Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from battery, and wait more than 20 seconds before starting to work.
 After replacing the airbag module, seat belt pretensioner, roll connector, control module or sensor,
reconnect each part and confirm that the airbag 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:
AB-00628
AIRBAG CONTROL MODULEAB7
SIDE AIRBAG
SENSOR LH
INFLATOR
(SIDE LH)
AB1012
6 5AB9
12 10
9 7
3
4
1
2
AB10
3412
AB9
12
AB7
123456
789101112

AB-79
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SIDE AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB9) from side
airbag module (LH), and connect the connec-
tor (1F) in test harness F to (AB9).
3) Connect the airbag resistor to connector
(3F) in test harness F.
4) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the front
seat with side air-
bag module (LH).
Front Seat.>Go to step 2.
2 CHECK SIDE AIRBAG HARNESS (LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB19) from the
seat belt pretensioner (LH). Front Seat Belt.>
3) Disconnect the airbag resistor from the test
harness.
4) Disconnect the connector (AB7) from the
airbag control module. Control Module.>
5) Connect the connector (1R) in test harness
R to connector (AB7).
6) Connect the battery ground cable, and turn
the ignition switch to ON.
7) Measure the voltage between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 10 (+) — Chassis ground (
−):
(3R) No. 12 (+) — Chassis ground (
−): Is the voltage less than 1 V? Replace the airbag
control module.
Airbag Control
Module.>Replace the side
airbag harness
with body harness.

AB-80
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
P: DTC 51
DIAGNOSIS:
 Side airbag sensor (RH) is faulty.
 Side airbag harness is faulty.
 Airbag control module is faulty.
CAUTION:
 Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from battery, and wait more than 20 seconds before starting to work.
 After replacing the airbag module, seat belt pretensioner, roll connector, control module or sensor,
reconnect each part and confirm that the airbag 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:
AB-00627
AIRBAG CONTROL MODULEAB8
SIDE AIRBAG
SENSOR RH
INFLATOR
(SIDE RH)
AB111 2
12AB12
12
109
7
3
4
1
2
AB8
123456
789101112
AB12
3412
AB11
12