1999 SUBARU FORESTER Service Repair Manual

5B2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between test harness I or I2
connector (2I) and test harness F connector (3F)
terminals.
Connector & terminal
(2I) No. 4 Ð (3F) No. 4:
S5M0260B
:Is resistance less than 10W?
: Go to step5B3.
: Replace airbag main harness. 5-5 [W4A0].>
5B3 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Measure resistance between test harness I or
I2 connector (2I) terminal.
Connector & terminal
(2I) No. 1 Ð No. 4:
S5M0261B
:Is resistance more than 1 MW?
: Go to step5B4.
: Replace airbag main harness. 5-5 [W4A0].>5B4 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Measure resistance between test harness I or
I2 connector (2I) terminals and chassis ground.
Connector & terminal
(2I) No. 4 (+) Ð Chassis ground (þ):
S5M0276B
:Is resistance more than 1 MW?
: Go to step5B5.
: Replace airbag main harness. 5-5 [W4A0].>
5B5 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between test harness I or I2
connector (2I) terminals and chassis ground.
Connector & terminal
(2I) No. 1 (+) Ð Chassis ground (þ):
S5M0277B
:Is resistance more than 1 MW?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
18
5-5[T5B2]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

C: TROUBLE CODE 12
DIAGNOSIS:
IAirbag main harness circuit is open, shorted or
shorted to ground.
IAirbag module harness (Passenger) circuit is
open, shorted or shorted to ground.
IAirbag control module is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5C1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Remove glove box.
2) Disconnect connector (AB9) and (AB10) to 5-5 [W3A2].> and connect connector (AB9) to
test harness F connector (1F).
3) Disconnect connector (AB6) [W6A0].> from airbag control module, and connect
it to test harness I or I2 connector (1I) terminal.
4) Measure resistance between test harness I or
I2 connector (2I) and test harness F connector (3F)
terminals.
Connector & terminal
(2I) No. 2 Ð (3F) No. 3:
S5M0262B
:Is resistance less than 10W?
: Go to step5C2.
: Replace airbag main harness. 5-5 [W4A0].>5C2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between test harness I or I2
connector (2I) and test harness F connector (3F)
terminals.
Connector & terminal
(2I) No. 5 Ð (3F) No. 4:
S5M0263B
:Is resistance less than 10W?
: Go to step5C3.
: Replace airbag main harness. 5-5 [W4A0].>
5C3 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Measure resistance between test harness I or
I2 connector (2I) terminal.
Connector & terminal
(2I) No. 2 Ð No. 5:
S5M0252B
:Is resistance more than 10 kW?
: Go to step5C4.
: Replace airbag main harness. 5-5 [W4A0].>
19
[T5C3]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5C4 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Measure resistance between test harness I or
I2 connector (2I) terminals and chassis ground.
Connector & terminal
(2I) No. 2 (+) Ð Chassis ground (þ):
S5M0278B
:Is resistance more than 1 MW?
: Go to step5C5.
: Replace airbag main harness. 5-5 [W4A0].>
5C5 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between test harness I or I2
connector (2I) terminals and chassis ground.
Connector & terminal
(2I) No. 5 (+) Ð Chassis ground (þ):
S5M0279B
:Is resistance more than 1 MW?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
D: TROUBLE CODE 15
DIAGNOSIS:
IAirbag main harness circuit (Driver) is shorted to
power supply.
IAirbag module harness (Driver) is shorted to
power supply.
IRoll connector is shorted to power supply.
IAirbag control module is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal and then wait at least
20 seconds.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5D1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Connect battery ground cable and turn ignition
switch ªONº (engine off).
3) Measure voltage across each test harness I or
I2 connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 4 (+) Ð Chassis ground (þ):
S5M0280B
:Is voltage less than 1 V?
: Go to step5D2.
: Replace airbag main harness. 5-5 [W4A0].>
20
5-5[T5C4]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5D2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure voltage across each test harness I or I2
connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 1 (+) Ð Chassis ground (þ):
S5M0281B
:Is voltage less than 1 V?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
E: TROUBLE CODE 16
DIAGNOSIS:
IAirbag main harness circuit (Passenger) is
shorted to power supply.
IAirbag module harness (Passenger) is shorted
to power supply.
IAirbag control module is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal and then wait at least
20 seconds.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5E1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Connect battery ground cable and turn ignition
switch ªONº (engine off).
3) Measure voltage across each test harness I or
I2 connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 2 (+) Ð Chassis ground (þ):
S5M0274B
:Is voltage less than 1 V?
: Go to step5E2.
: Replace airbag main harness. 5-5 [W4A0].>
21
[T5E1]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5E2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure voltage across each test harness I or I2
connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 5 (+) Ð Chassis ground (þ):
S5M0275B
:Is voltage less than 1 V?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
F: TROUBLE CODE 21
DIAGNOSIS:
Airbag control module is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal, and then wait at least
20 seconds.
5F1 : CHECK IF TROUBLE CODE 21 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
21 indicated?
: Replace airbag control module. 5-5 [W6A0].>
: Perform clear memory. [T4C0].>
22
5-5[T5E2]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

G: TROUBLE CODE 22
DIAGNOSIS:
Front airbag module is inflated.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal, and then wait at least
20 seconds.
5G1 : CHECK IF TROUBLE CODE 22 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
22 indicated?
: Replace airbag control module 5-5 [W6A0].>, front sub sensor 5-5 [W9A0].> and front airbag module of
both sides.
: Perform clear memory. [T4C0].>
H: TROUBLE CODE 23
DIAGNOSIS:
(AB6), (AB17) and (AB18) are not connected prop-
erly to airbag control module.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
5H1 : CHECK POOR CONTACT IN CON-
NECTORS (AB6), (AB17) AND (AB18).
Check connectors (AB6), (AB17) and (AB18) con-
nected to airbag control module. [W6A0].>
:Is there poor contact in connectors
(AB6), (AB17) and (AB18)?
: Repair poor contact in connectors
(AB6), (AB17) and (AB18).
: Replace airbag control module. 5-5 [W6A0].>
23
[T5H1]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

I: TROUBLE CODE 24
DIAGNOSIS:
IAirbag control module is faulty.
IAirbag main harness circuit is open.
IFuse No. 11 (in joint box) is blown.
IBody harness circuit is open.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5I1 : AIRBAG CONTROL MODULE INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Connect battery ground cable and turn ignition
switch ªONº (engine off).
3) Measure voltage across connector (2I) terminal
and chassis ground.
Connector & terminal
(2I) No. 3 (+) Ð Chassis ground (þ):
S5M0264B
:Is voltage more than 10 V?
: Replace airbag control module. 5-5 [W6A0].>
: Go to step5I2.5I2 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Go to following procedure after performing
diagnostics on airbag system as per diagnosis pro-
cedure under ª5I1 AIRBAG CONTROL MODULE
INSPECTIONº previously out-
lined.
2) Turn ignition switch ªOFFº, disconnect battery
ground cable and then wait at least 20 seconds.
3) Disconnect connector (AB1) from body harness
connector (B31) located in front pillar lower (driver
side), and connect connector (AB1) to test harness
A connector (2A).
B5M0122B
4) Measure resistance between test harness A
connector (5A) and test harness I or I2 connector
(2I) terminals.
Connector & terminal
(5A) No. 9 Ð (2I) No. 3:
S5M0265B
:Is resistance less than 10W?
: Go to step5I3.
: Replace airbag main harness. 5-5 [W4A0].>
24
5-5[T5I0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5I3 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between each terminal of con-
nectors (5A) and chassis ground.
Connector & terminal
(5A) No. 9 (+) Ð Chassis ground (þ):
S5M0266A
:Is resistance more than 10 kW?
: Go to step5I4.
: Replace airbag main harness. 5-5 [W4A0].>
5I4 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between each terminal of con-
nectors (2I) and chassis ground.
Connector & terminal
(2I) No. 3 (+) Ð Chassis ground (þ):
S5M0267B
:Is resistance more than 10 kW?
: Go to step5I5.
: Replace airbag main harness. 5-5 [W4A0].>5I5 : FUSE NO. 11 (IN JOINT BOX) INSPEC-
TION
Make sure ignition switch is turned ªOFFº, then
remove and visually check fuse No. 11 (in joint
box).
S5M0257B
:Is fuse No. 11 blown?
: Replace fuse No. 11. If fuse No. 11
blows again, repair body harness.
: Repair body harness.
25
[T5I5]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code