2004 SUBARU FORESTER sensor
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AB-62
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
I: DTC 25
DIAGNOSIS:
Airbag control module is faulty.
Airbag main harness circuit is open.
Fuse No. 6 (in joint box) is blown.
Body harness circuit is open.
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.
1. LHD MODEL
WIRING DIAGRAM:
AB-00624
AB3
AIRBAG CONTROL MODULEAB3
B31
AB1
AB1
2
5
BATTERY
IG SW
NO.6
B31
12
34561
23 45 61234567891011121314151617
1819202122232425262728
Page 198 of 2870
AB-66
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
J: DTC 31
DIAGNOSIS:
Front sub-sensor harness circuit (RH) is shorted, open or shorted to power supply.
Airbag main harness circuit is shorted, open or shorted to power supply.
Front sub-sensor (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.
WIRING DIAGRAM:
AB-00747
AB3
AB13
AB14
AB15
AB3
LHD
RHD
LHD
RHD
LHD
FRONT SUB SENSOR RH
209
21
RHD
LHDRHD
AB13AB15
1212
AIRBAG CONTROL MODULE
1
2
1234567891011121314151617
1819202122232425262728
Page 199 of 2870
AB-67
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK FRONT SUB-SENSOR (RH) AND
AIRBAG HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R.
3) Measure the resistance of the connector
(3R) in test harness R.
Connector & terminal
(3R) No. 7 — (3R) No. 9: Is the resistance 750 Ω and 1
KΩ? Replace the airbag
control module.
Module.>Go to step 2.
2 CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (RH).
1) Disconnect the connector (AB15) from the
front sub-sensor.
2) Connect the connector (IH) in test harness
H to connector (AB15).
3) Measure the resistance between connector
(3R) in test harness R and connector (3H) in
test harness H.
Connector & terminal
(3R) No. 7 — (3H) No. 5:
(3R) No. 9 — (3H) No. 6: Is the resistance less than 10
Ω?Go to step 3.LHD model:
Replace the airbag
main harness and
front sub-sensor
harness with body
harness.
RHD model:
Go to step 4.
3 CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (RH).
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 7 — Chassis ground:
(3R) No. 9 — Chassis ground: Is the resistance more than 1
MΩ?Go to step 8.LHD model:
Replace the airbag
main harness and
front sub-sensor
harness with body
harness.
RHD model:
Go to step 4.
4 CHECK AIRBAG MAIN HARNESS
1) Disconnect the connector (AB13) from
(AB14), and connect the connector (1L) in test
harness L to connector (AB13).
2) Measure the resistance between connector
(3R) in test harness R and connector (3L) in
test harness L.
Connector & terminal
(3R) No. 7 — (3L) No. 4:
(3R) No. 9 — (3L) No. 3: Is the resistance less than 10
Ω?Go to step 5.Replace the airbag
main harness with
body harness.
5 CHECK AIRBAG MAIN HARNESS
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 7 — Chassis ground:
(3R) No. 9 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 6.Replace the airbag
main harness with
body harness.
6 CHECK FRONT SUB-SENSOR HARNESS
(RH).
1) Connect the connector (2L) in test harness
F to the connector (AB14).
2) Measure the resistance between connector
(3H) in test harness H and connector (3L) in
the test harness L.
Connector & terminal
(3L) No. 5 — (3H) No. 5:
(3L) No. 6 — (3H) No. 6: Is the resistance less than 10
Ω?Go to step 7.Replace the front
sub-sensor har-
ness (RH) with
body harness.
Page 200 of 2870
AB-68
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7 CHECK FRONT SUB-SENSOR HARNESS
(RH).
Measure the resistance between connector
(3L) in test harness L and the chassis ground.
Connector & terminal
(3L) No. 5 — Chassis ground:
(3L) No. 6 — Chassis ground: Is the resistance more than 1
MΩ?Go to step 8.Replace the front
sub-sensor har-
ness (RH) with
body harness.
8 CHECK FRONT SUB-SENSOR (RH).
1) Connect the connector (2H) in test harness
H to front sub-sensor (RH).
2) Measure the resistance of the connector
(3H) in test harness H.
Connector & terminal
(3H) No. 3 — No. 4: Is the resistance 750 Ω and 1
KΩ?Go to step 9.Replace the front
sub-sensor (RH).
sor.>
9 CHECK FRONT SUB-SENSOR (RH).
Measure the resistance between connector
(3H) in test harness H and the chassis ground.
Connector & terminal
(3H) No. 3 — Chassis ground:
(3H) No. 4 — Chassis ground:Is the resistance more than 1
MΩ?Finish the diagno-
sis.Replace the front
sub-sensor (RH).
sor.> Step Check Yes No
Page 201 of 2870
AB-69
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
K: DTC 32
DIAGNOSIS:
Front sub-sensor harness circuit (LH) is shorted.is shorted, open or shorted to power supply.
Airbag main harness circuit is shorted, open or shorted to power supply.
Front sub-sensor (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.
WIRING DIAGRAM:
AB-00748
AB3
AB13
AB14
AB18
AB3
RHD
LHD
RHD
LHD
RHD
1526
1 2
21
LHD
RHDLHD
AB13AB18
1212
AIRBAG CONTROL MODULE
FRONT SUB SENSOR LH
1234567891011121314151617
1819202122232425262728
Page 202 of 2870
AB-70
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK FRONT SUB-SENSOR (LH) AND
AIRBAG HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB3) from the
airbag control module, and connect connector
(1R) in the test harness R to connector (AB3).
3) Measure the resistance of the connector
(3R) in the test harness R.
Connector & terminal
(3R) No. 6 — (3R) No. 8: Is the resistance 750 Ω and 1
KΩ?Replace the airbag
control module.
Module.>Go to step 2.
2 CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (LH).
1) Disconnect the connector (AB18) from the
front sub-sensor.
2) Connect the connector (1H) in test harness
H to connector (AB18).
3) Measure the resistance between connector
(3R) in test harness R and connector (3H) in
test harness H.
Connector & terminal
(3R) No. 6 — (3H) No. 5:
(3R) No. 8 — (3H) No. 6: Is the resistance less than 10
Ω?Go to step 3.LHD model:
Go to step 4.
RHD model:
Replace the airbag
main harness and
front sub-sensor
harness with body
harness.
3 CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (LH).
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 6 — Chassis ground:
(3R) No. 8 — Chassis ground: Is the resistance more than 1
MΩ?Go to step 8.LHD model:
Go to step 4.
RHD model:
Replace the airbag
main harness and
front sub-sensor
harness with body
harness.
4 CHECK AIRBAG MAIN HARNESS
1) Disconnect the connector (AB13) from
(AB14), and connect the connector (1L) in test
harness L to connector (AB13).
2) Measure the resistance between connector
(3R) in test harness R and connector (3L) in
test harness L.
Connector & terminal
(3R) No. 6 — (3L) No. 4:
(3R) No. 8 — (3L) No. 3: Is the resistance less than 10
Ω?Go to step 5.Replace the airbag
main harness with
body harness.
5 CHECK AIRBAG MAIN HARNESS
Measure the resistance between connector
(3R) in test harness R and the chassis ground.
Connector & terminal
(3R) No. 6 — Chassis ground:
(3R) No. 8 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 6.Replace the airbag
main harness with
body harness.
6 CHECK FRONT SUB-SENSOR HARNESS
(LH).
1) Connect the connector (2L) in test harness
L to the connector (AB14).
2) Measure the resistance between connector
(3H) in test harness H and connector (3L) in
the test harness L.
Connector & terminal
(3L) No. 5 — (3H) No. 5:
(3L) No. 6 — (3H) No. 6: Is the resistance less than 10
Ω?Go to step 7.Replace the front
sub-sensor har-
ness (LH) with
body harness.
Page 203 of 2870
AB-71
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7 CHECK FRONT SUB-SENSOR HARNESS
(LH).
Measure the resistance between connector
(3L) in test harness L and the chassis ground.
Connector & terminal
(3L) No. 5 — Chassis ground:
(3L) No. 6 — Chassis ground: Is the resistance more than 1
MΩ?Go to step 8.Replace the front
sub-sensor har-
ness (LH) with
body harness.
8 CHECK FRONT SUB-SENSOR (LH).
1) Connect the connector (2H) in test harness
H to front sub-sensor (LH).
2) Measure the resistance of the connector
(3H) in test harness H.
Connector & terminal
(3H) No. 3 — (3H) No. 4: Is the resistance 750 Ω and 1
KΩGo to step 9.Replace the front
sub-sensor (LH).
sor.>
9 CHECK FRONT SUB-SENSOR (LH).
Measure the resistance between connector
(3H) in test harness H and the chassis ground.
Connector & terminal
(3H) No. 3 — Chassis ground:
(3H) No. 4 — Chassis ground:Is the resistance more than 1
MΩ?Finish the diagno-
sis.Replace the front
sub-sensor (LH).
sor.> Step Check Yes No
Page 204 of 2870
AB-72
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
L: DTC 41
DIAGNOSIS:
Side airbag harness (RH) is faulty.
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