2004 SUBARU FORESTER sensor

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-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-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-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

AB-81
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SIDE AIRBAG (RH) HARNESS.
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 connector (AB11) from side
airbag module (RH).
5) Disconnect the connector (AB8) from the
airbag control module. Control Module.>
6) Connect the connector (1R) in test harness
R to the connector (AB8).
7) Disconnect the connector (AB12) from the
side airbag sensor (RH), and connect the con-
nector (1G) in test harness G to connector
(AB12).
8) Measure the resistance between connector
(4R) in test harness R and connector (3G) in
test harness G.
Connector & terminal
(4R) No. 5 — (3G) No. 2:
(4R) No. 6 — (3G) No. 4:
(4R) No. 7 — (3G) No. 1:
(4R) No. 8 — (3G) No. 5: Is the resistance less than 10
Ω?Go to step 2.Replace the side
airbag harness
with body harness.
2 CHECK SIDE AIRBAG HARNESS.
Measure the resistance between connector
(4R) in test harness R and the chassis ground.
Connector & terminal
(4R) No. 5 — Chassis ground:
(4R) No. 6 — Chassis ground:
(4R) No. 7 — Chassis ground:
(4R) No. 8 — Chassis ground:Is the resistance more than 1
MΩ?Replace the side
airbag sensor
(RH). 19, Side Airbag
Sensor.> When
sensor replace-
ment is not OK,
replace the airbag
control module.
Airbag Control
Module.>Replace the side
airbag harness
with body harness.

AB-82
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Q: DTC 52
DIAGNOSIS:
 Side airbag sensor (LH) is faulty.
 Side airbag harness (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-83
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK SIDE AIRBAG (LH) HARNESS.
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 connector (AB9) from side
airbag module (LH).
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) Disconnect the connector (AB10) from the
side airbag sensor (LH), and connect the con-
nector (1G) in test harness G to connector
(AB10).
7) Measure the resistance between connector
(4R) in test harness R and connector (3G) in
test harness G.
Connector & terminal
(4R) No. 4 — (3G) No. 2:
(4R) No. 3 — (3G) No. 4:
(4R) No. 2 — (3G) No. 1:
(4R) No. 1 — (3G) No. 5:Is the resistance less than 10
Ω?Go to step 2.Replace the side
airbag harness
with body harness.
2 CHECK SIDE AIRBAG (LH) HARNESS.
Measure the resistance between connector
(4R) in test harness R and the chassis ground.
Connector & terminal
(4R) No. 4 — Chassis ground:
(4R) No. 3 — Chassis ground:
(4R) No. 2 — Chassis ground:
(4R) No. 1 — Chassis ground:Is the resistance more than 1
MΩ?Replace the side
airbag sensor
(LH). 19, Side Airbag
Sensor.> When
sensor replace-
ment is not OK,
replace the airbag
control module.
Airbag Control
Module.>Replace the side
airbag harness
with body harness.

AB-84
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
R: DTC 53
DIAGNOSIS:
 Side airbag sensor (RH) is faulty.
When Code 53 is displayed, the circuit within the side airbag sensor (RH) is faulty. Replace the side airbag
sensor (RH).

S: DTC 54
DIAGNOSIS:
 Side airbag sensor (LH) is faulty.
When Code 53 is displayed, the circuit within the side airbag sensor (LH) is faulty. Replace the side airbag
sensor (LH).

T: DTC 55
This code is displayed when the side airbag is operate.
When this code is displayed, the memory cannot be erased. Replace the following parts.
 Airbag control module.
 Front seat with side airbag module. (Operating side)
 Side airbag sensor. (Operating side)