replace disc SUBARU FORESTER 2004 Service Owner's Guide

AB-35
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
1. LHD MODEL
WIRING DIAGRAM:
Step Check Yes No
1 CHECK POOR CONTACT IN CONNECTORS
(AB1) AND (B31).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the side sill cover. (Driver’s side)
3) Confirm that firm contact is secured
between connectors (AB1) and (B31).Is the poor contact in connec-
tors (AB1) and (B31)?Repair the body
harness or replace
the airbag main
harness with body
harness.Go to step 2.
AB-00739
12
34561
2345678910123456789101112131415161718192021222324252627282930
B31 i11AB3
i10
B:
C: i10
i11
AIRBAG
WARNING
LIGHTCOMBINATION
METERB9
B8
B10
NO.14
i3B38 28
i2B37 19
5
AIRBAG CONTROL MODULEAB3
B31
AB1
3
3
AIRBAG
CIRCUIT
E
BATTERY
1234567891011121314151617
1819202122232425262728
IGNITION
SWITCH
B: C:

AB-36
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
2 CHECK AIRBAG WARNING LIGHT.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Connect the connector (1T) in test harness
T to body harness connector (B31).
3) Connect the connector (1M) in test harness
M to connector (2T) in test harness T.
4) Connect the battery ground cable and turn
the ignition switch to ON.
5) Connect the connectors, (3M) and (4M) in
test harness M.Is the airbag warning light
turned off?Go to step 4.Go to step 3.
3 CHECK BODY HARNESS.
Check the body harness.
N
OTE:
After problem has been eliminated, disconnect
the connectors (3M) and (4M).Is the anything unusual to body
harness? Repair the body
harness.Replace the com-
bination meter
printed circuit.
<Ref. to IDI-10,
Combination
Meter Assembly.>
4 CHECK POOR CONTACT.
Confirm that firm contact is secured between
the airbag control module and the connector
(AB3). <Ref. to AB-18, Airbag Control Mod-
ule.>Is the poor contact in connec-
tor (AB3)?Replace the airbag
main harness with
body harness or
replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Go to step 5.
5 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Connect the connector (AB1) to (B31).
3) Disconnect the connectors (AB2) and
(AB30).
4) Remove the glove box and disconnect the
connectors (AB4).
5) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R. <Ref. to AB-18,
Airbag Control Module.>
6) Connect the battery ground cable and turn
the ignition switch to ON.
7) Connect the connectors (5R) and (6R) in
test harness R.
N
OTE:
After problem has been eliminated, disconnect
the connectors (5R) and (6R).Is the airbag warning light
turned off?Go to step 6.Replace the airbag
main harness with
body harness.
6 CHECK GROUNDING CIRCUIT.
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.
3) Connect the connector (1R) in test harness
R to body harness connector (AB3).
4) Measure the resistance between connector
(2R) in test harness R and the chassis ground.
Connector & terminal
(2R) No. 10 — Chassis ground:
(2R) No. 11 — Chassis ground: Is the resistance less than 10
Ω?Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Repair the body-
grounding circuit. Step Check Yes No

AB-37
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
2. RHD MODEL
WIRING DIAGRAM:
Step Check Yes No
1 CHECK POOR CONTACT IN CONNECTORS
(AB1) AND (B31).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the side sill cover. (Driver’s side)
3) Confirm that firm contact is secured
between connectors (AB1) and (B31).Is the poor contact in connec-
tors (AB1) and (B31)?Repair the body
harness or replace
the airbag main
harness with body
harness.Go to step 2.
AB-00740
12
34561
2345678910123456789101112131415161718192021222324252627282930
B31 i11AB3
i10
B:
C: i10
i11
AIRBAG
WARNING
LIGHTCOMBINATION
METERB9
B8
B10
NO.14
i3B38 20
10
16
AIRBAG CONTROL MODULEAB3
B31
AB1
1
3
AIRBAG
CIRCUIT
E
BATTERY
1234567891011121314151617
1819202122232425262728
IGNITION
SWITCH

AB-38
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
2 CHECK AIRBAG WARNING LIGHT.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Connect the connector (1M) in test harness
M to body harness connector (B31).
3) Connect the battery ground cable and turn
the ignition switch to ON.
4) Connect the connectors, (3M) and (4M) in
test harness M.Is the airbag warning light
turned off?Go to step 4.Go to step 3.
3 CHECK BODY HARNESS.
Check the body harness.
N
OTE:
After problem has been eliminated, disconnect
the connectors (3M) and (4M).Is the anything unusual to body
harness?Repair the body
harness.Replace the com-
bination meter
printed circuit.
<Ref. to IDI-10,
Combination
Meter Assembly.>
4 CHECK POOR CONTACT.
Confirm that firm contact is secured between
the airbag control module and the connector
(AB3). <Ref. to AB-18, Airbag Control Mod-
ule.>Is the poor contact in connec-
tor (AB3)? Replace the airbag
main harness with
body harness or
replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Go to step 5.
5 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Connect the connector (AB1) to (B31).
3) Disconnect the connectors (AB21) and
(AB26).
4) Remove the glove box and disconnect the
connectors (AB4).
5) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R. <Ref. to AB-18,
Airbag Control Module.>
6) Connect the battery ground cable and turn
the ignition switch to ON.
7) Connect the connectors (5R) and (6R) in
test harness R.
N
OTE:
After problem has been eliminated, disconnect
the connectors (5R) and (6R).Is the airbag warning light
turned off? Go to step 6.Replace the airbag
main harness with
body harness.
6 CHECK GROUNDING CIRCUIT.
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.
3) Connect the connector (1R) in test harness
R to body harness connector (AB3).
4) Measure the resistance between connector
(2R) in test harness R and the chassis ground.
Connector & terminal
(2R) No. 10 — Chassis ground:
(2R) No. 11 — Chassis ground: Is the resistance less than 10
Ω?Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Repair the body-
grounding circuit. Step Check Yes No

AB-40
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
Step Check Yes No
1 CHECK COMBINATION METER.
Turn the ignition switch to ON, and confirm that
warning lights equipped in the combination
meter are turned on.Do the warning lights not for
airbag turn on?Go to step 2.Repair the combi-
nation meter
power supply.
<Ref. to IDI-3,
Combination
Meter System.>
2 CHECK FUSE NO. 14 (IN FUSE&RELAY
BOX).
Remove the fuse No. 14 and perform visual
inspection.Is the fuse No. 14 (in fuse &
relay box) blown out? Replace the fuse
No. 14. If fuse No.
14 blows again, go
to step 3. Go to step 3.
3 CHECK AIRBAG WARNING LIGHT CIRCUIT
(IN COMBINATION METER).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB1) from
(B31).
3) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on?Go to step 4.Replace the airbag
warning light bulb
or combination
meter printed cir-
cuit. <Ref. to IDI-
10, Combination
Meter Assembly.>
4 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Connect the connector (AB1) to (B31).
3) Disconnect the connector (AB3) from the
airbag control module. <Ref. to AB-18, Airbag
Control Module.>
4) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on?Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Replace the airbag
main harness with
body harness.

AB-42
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
Step Check Yes No
1 CHECK COMBINATION METER.
Turn the ignition switch to ON, and confirm that
warning lights equipped in the combination
meter are turned on.Do the warning lights not for
airbag turn on?Go to step 2.Repair the combi-
nation meter
power supply.
<Ref. to IDI-3,
Combination
Meter System.>
2 CHECK FUSE NO. 14 (IN FUSE&RELAY
BOX).
Remove the fuse No. 14 and perform visual
inspection.Is the fuse No. 14 (in fuse &
relay box) blown out?Replace the fuse
No. 14. If fuse No.
14 blows again, go
to step 3. Go to step 3.
3 CHECK AIRBAG WARNING LIGHT CIRCUIT
(IN COMBINATION METER).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the connector (AB1) from
(B31).
3) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on?Go to step 4.Replace the airbag
warning light bulb
or combination
meter printed cir-
cuit. <Ref. to IDI-
10, Combination
Meter Assembly.>
4 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Connect the connector (AB1) to (B31).
3) Disconnect the connector (AB3) from the
airbag control module. <Ref. to AB-18, Airbag
Control Module.>
4) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on?Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Replace the airbag
main harness with
body harness.

AB-47
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK DRIVERS AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the driver’s airbag module. <Ref.
to AB-14, Driver’s Airbag Module.>
3) Connect the connector (1N) in test harness
N to connector (AB2).
4) Connect the airbag resistor to connector
(2N) in test harness N.
5) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the
driver’s airbag
module. <Ref. to
AB-14, Driver’s
Airbag Module.>Go to step 2.
2 CHECK ROLL CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 second.
2) Disconnect the test harness N from the
connector (AB2).
3) Remove the instrument panel lower cover,
disconnect the connector (AB26) from (AB21)
and connect the connector (1F) in test harness
F to connector (AB21).
4) Connect the airbag resistor to connector
(3F) in test harness F.
5) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light turn
on normally?Replace the roll
connector. <Ref. to
AB-20, Roll Con-
nector.>Go to step 3.
3 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the ground cable, and wait more than 20 sec-
onds.
2) Disconnect the airbag resistor from the
connector (3F) in test harness F.
3) Remove the glove box, and disconnect con-
nectors (AB4) and passenger’s airbag module
(AB27). <Ref. to AB-15, Passenger’s Airbag
Module.>
4) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R. <Ref. to AB-18,
Airbag Control Module.>
5) Measure the resistance between connector
(2R) in test harness R and the connector (3F)
in test harness F.
Connector & terminal
(2R) No. 2 — (3F) No. 4:
(2R) No. 4 — (3F) No. 3: Is the resistance less than 10
Ω?Go to step 4.Replace the airbag
main harness with
body harness.
4 CHECK AIRBAG MAIN HARNESS.
Measure the resistance of the connector (2R)
in test harness R.
Connector & terminal
(2R) No. 2 — (2R) No. 4:
(2R) No. 4 — Chassis ground:
(2R) No. 2 — Chassis ground:Is the resistance more than 1
MΩ?Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Replace the airbag
main harness with
body harness.

AB-49
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK PASSENGERS AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the glove box.
3) Disconnect the passenger’s airbag connec-
tor (AB27) and (AB4).
4) Connect the connector (1P) in test harness
P to connector (AB4).
5) Connect the airbag resistor to connector
(2P), (3P) in test harness P.
6) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the pas-
senger airbag
module. <Ref. to
AB-15, Passen-
ger’s Airbag Mod-
ule.>Go to step 2.
2 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the airbag resistor from the
connector in test harness P.
3) Remove the instrument panel lower cover
and disconnect the connector (AB21) from
(AB26).
4) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R. <Ref. to AB-18,
Airbag Control Module.>
5) Measure the resistance between connector
(2R) in test harness R and the connector (2P)
in test harness P.
Connector & terminal
(2R) No. 3 — (2P) No. 3:
(2R) No. 5 — (2P) No. 4: Is the resistance less than 10
Ω?Go to step 3.Replace the airbag
main harness with
body harness.
3 CHECK AIRBAG MAIN HARNESS.
Measure the resistance of the connector (2R)
in test harness R.
Connector & terminal
(2R) No. 3 — (2R) No. 5:
(2R) No. 3 — Chassis ground:
(2R) No. 5 — Chassis ground:Is the resistance more than 1
MΩ?Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Replace the airbag
main harness with
body harness.

AB-51
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK DRIVERS AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the driver’s airbag module. <Ref.
to AB-14, Driver’s Airbag Module.>
3) Connect the connector (AB2) to connector
(1N) in test harness N.
4) Connect the airbag resistor to connector
(2N) in test harness N.
5) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the
driver’s airbag
module. <Ref. to
AB-14, Driver’s
Airbag Module.>Go to step 2.
2 CHECK ROLL CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the test harness N from the
connector (AB2).
3) Remove the instrument panel lower cover
and disconnect the connector (AB21) from
(AB26).
4) Connect the connector (1F) in test harness
F to connector (AB21).
5) Connect the airbag resistor to connector
(3F) in test harness F.
6) Connect the battery ground cable and turn
the ignition switch to ON.Is the airbag warning light
turned on normally?Replace the roll
connector. <Ref. to
AB-20, Roll Con-
nector.>Go to step 3.
3 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the airbag resistor from the
connector (3F) in test harness F.
3) Remove the glove box, and disconnect the
connectors (AB4) and passenger’s airbag
module (AB27).
4) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R. <Ref. to AB-18,
Airbag Control Module.>
5) Connect the battery ground cable and turn
the ignition switch to ON. (engine OFF)
6) Measure the voltage between connector
(2R) in test harness R and the chassis ground.
Connector & terminal
(2R) No. 2 (+) — Chassis ground (
−):
(2R) No. 4 (+) — Chassis ground (
−): Is the voltage less than 1 V? Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Replace the airbag
main harness with
body harness.

AB-53
AIRBAG SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK PASSENGERS AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the glove box.
3) Disconnect the passenger’s airbag connec-
tor (AB27) and (AB4).
4) Connect the connector (1P) in test harness
P to connector (AB4).
5) Connect the airbag resistor to connector
(2P), (3P) in test harness P.
6) Connect the battery ground cable and turn
the ignition switch to ON. Is the airbag warning light
turned on normally?Replace the pas-
senger airbag
module. <Ref. to
AB-15, Passen-
ger’s Airbag Mod-
ule.>Go to step 2.
2 CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Disconnect the airbag resistor from the
connector in test harness P.
3) Remove the instrument panel lower cover
and disconnect the connector (AB21) from
(AB26).
4) Disconnect the connector (AB3) from the
airbag control module, and connect the con-
nector (1R) in test harness R. <Ref. to AB-18,
Airbag Control Module.>
5) Connect the battery ground cable and turn
the ignition switch to ON.
6) Measure the voltage between connector
(2R) in test harness R and the chassis ground.
Connector & terminal
(2R) No. 3 (+) — Chassis ground (
−):
(2R) No. 5 (+) — Chassis ground (
−): Is the voltage less 1 V? Replace the airbag
control module.
<Ref. to AB-18,
Airbag Control
Module.>Replace the airbag
main harness with
body harness.