1999 SUBARU FORESTER Service Repair Manual

J: TROUBLE CODE 25
DIAGNOSIS:
IAirbag control module is faulty.
IAirbag main harness circuit is open.
IFuse No. 6 (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).
5J1 : AIRBAG CONTROL MODULE
INSPECTION
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. 6 (+) Ð Chassis ground (þ):
S5M0253B
:Is voltage more than 10 V?
: Replace airbag control module. 5-5 [W6A0].>
: Go to step5J2.5J2 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Go to following procedure after performing
diagnostics on airbag system as per diagnosis pro-
cedure under ª5J1 AIRBAG CONTROL MODULE
INSPECTIONº previously
outlined.
2) Turn ignition switch ªOFFº, disconnect battery
ground terminal and then wait at least 20 seconds.
3) Disconnect body harness connector (B31) from
connector (AB1) 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) terminal and test harness I or I2
connector (2I) terminal.
Connector & terminal
(5A) No. 1 Ð (2I) No. 6:
S5M0254B
:Is resistance less than 10W?
: Go to step5J3.
: Replace airbag main harness. 5-5 [W4A0].>
26
5-5[T5J0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5J3 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between (5A) connector termi-
nal and chassis ground.
Connector & terminal
(5A) No. 1 (+) Ð Chassis ground (þ):
S5M0255A
:Is resistance more than 10 kW?
: Go to step5J4.
: Replace airbag main harness. 5-5 [W4A0].>
5J4 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between (2I) connector termi-
nal and chassis ground.
Connector & terminal
(2I) No. 6 (+) Ð Chassis ground (þ):
S5M0256B
:Is resistance more than 10 kW?
: Go to step5J5.
: Replace airbag main harness. 5-5 [W4A0].>5J5 : FUSE NO. 6 (IN JOINT BOX) INSPEC-
TION
1) Turn ignition switch ªOFFº.
2) Remove and visually check fuse No. 6 (in joint
box).
S5M0257A
:Is fuse No. 6 blown?
: Replace fuse No. 6 if fuse No. 6 blows
again, repair body harness.
: Repair body harness.
27
[T5J5]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

K: TROUBLE CODE 31
DIAGNOSIS:
IFront sub sensor harness (RH) circuit is shorted.
IFront sub sensor harness (RH) circuit is open.
IFront sub sensor (RH) is faulty.
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.
5K1 : FRONT SUB SENSOR (RH) AND
FRONT SUB SENSOR HARNESS
(RH) INSPECTION
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 (3I) terminal.
Connector & terminal
(3I) No. 2 Ð No. 4:
B5M0554B
:Is the resistance between 750Wand
1k
W?
: Go to step5K2.
: Go to step5K4.5K2 : FRONT SUB SENSOR (RH) AND
FRONT SUB SENSOR HARNESS
(RH) INSPECTION
Measure resistance across test harness I or I2
connector (3I) terminal and chassis ground.
Connector & terminal
(3I) No. 2 (+) Ð Chassis ground (þ):
B5M0555B
:Is the resistance more than 10 kW?
: Go to step5K3.
: Go to step5K4.
5K3 : FRONT SUB SENSOR (RH) AND
FRONT SUB SENSOR HARNESS
(RH) INSPECTION
Measure resistance across test harness I or I2
connector (3I) terminal and chassis ground.
Connector & terminal
(3I) No. 4 (+) Ð Chassis ground (þ):
B5M0556B
:Is the resistance more than 10 kW?
: Replace airbag control module. 5-5 [W6A0].>
: Go to step5K4.
28
5-5[T5K0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5K4 : FRONT SUB SENSOR (RH) INSPEC-
TION
1) Connect test harness H connector (2H) and
front sub sensor (RH).
2) Measure resistance between test harness H
connector (3H) terminal.
Connector & terminal
(3H) No. 3 Ð No. 4:
B5M0566A
:Is the resistance between 750Wand
1k
W?
: Go to step5K5.
: Replace front sub sensor (RH). 5-5 [W9A0].>
5K5 : FRONT SUB SENSOR (RH) INSPEC-
TION
Measure resistance across test harness H connec-
tor (3H) terminal and chassis ground.
Connector & terminal
(3H) No. 3 (+) Ð Chassis ground (þ):
B5M0567A
:Is the resistance less than 10 kW?
: Go to step5K6.
: Replace front sub sensor (RH). 5-5 [W9A0].>5K6 : FRONT SUB SENSOR (RH) INSPEC-
TION
Measure resistance across test harness H connec-
tor (3H) terminal and chassis ground.
Connector & terminal
(3H) No. 4 (+) Ð Chassis ground (þ):
B5M0568A
:Is the resistance less than 10 kW?
: Go to step5K7.
: Replace front sub sensor (RH). 5-5 [W9A0].>
29
[T5K6]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5K7 : FRONT SUB SENSOR HARNESS
(RH) INSPECTION
1) Connect test harness I or I2 connector (1I) and
connector (AB6).
2) Disconnect connector (AB16) from front sub
sensor (RH) and then test
harness H connector (1H) and connector (AB16).
3) Measure resistance between test harness I or
I2 connector (3I) terminal and test harness H con-
nector (3H) terminal.
Connector & terminal
(3I) No. 2 Ð (3H) No. 5:
S5M0352A
:Is the resistance less than 10W?
: Go to step5K8.
: Replace front sub sensor harness (RH)
and airbag main
harness. 5K8 : FRONT SUB SENSOR HARNESS
(RH) INSPECTION
Measure resistance between test harness I or I2
connector (3I) terminal and test harness H connec-
tor (3H) terminal.
Connector & terminal
(3I) No. 4 Ð (3H) No. 6:
S5M0353A
:Is the resistance less than 10W?
: Go to step5K9.
: Replace front sub sensor harness (RH)
and airbag main
harness.
30
5-5[T5K7]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5K9 : FRONT SUB SENSOR HARNESS
(RH) INSPECTION
1) Connect test harness I or I2 connector (1I) and
connector (AB6).
2) Disconnect connector (AB16) from front sub
sensor (RH) and then test
harness H connector (1H) and connector (AB16).
3) Measure resistance between test harness I or
I2 connector (3I) terminal and test harness H con-
nector (3H) terminal.
Connector & terminal
(3I) No. 2 Ð (3H) No. 6:
S5M0419A
:Is the resistance more than 1 MW?
: Go to step5K10.
: Replace front sub sensor harness (RH)
and airbag main
harness. 5K10 : FRONT SUB SENSOR HARNESS
(RH) INSPECTION
Measure resistance between test harness I or I2
connector (3I) terminal and test harness H connec-
tor (3H) terminal.
Connector & terminal
(3I) No. 4 Ð (3H) No. 5:
S5M0420A
:Is the resistance more than 1 MW?
: Go to step5K11.
: Replace front sub sensor harness (RH)
and airbag main
harness.
5K11 : FRONT SUB SENSOR HARNESS
(RH) INSPECTION
Measure resistance across test harness I or I2
connector (3I) terminal and chassis ground.
Connector & terminal
(3I) No. 2 (+) Ð Chassis ground (þ):
S5M0354A
:Is the resistance more than 10 kW?
: Go to step5K12.
: Replace front sub sensor harness (RH)
and airbag main
harness.
31
[T5K11]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5K12 : FRONT SUB SENSOR HARNESS
(RH) INSPECTION
Measure resistance across test harness I or I2
connector (3I) terminal and chassis ground.
Connector & terminal
(3I) No. 4 (+) Ð Chassis ground (þ):
S5M0355A
:Is the resistance more than 10 kW?
: Go to step5K13.
: Replace front sub sensor harness (RH)
and airbag main
harness.
5K13 : CHECK POOR CONTACT IN CON-
NECTORS (AB14) AND (AB15).
Check connectors (AB14) and (AB15).
:Is there poor contact in connectors
(AB14) and (AB15)?
: Repair poor contact in connectors
(AB14) and (AB15).
: Replace front sub sensor harness (RH)
and airbag main
harness.
L: TROUBLE CODE 32
DIAGNOSIS:
IFront sub sensor harness (LH) circuit is shorted.
IFront sub sensor harness (LH) circuit is open.
IFront sub sensor (LH) is faulty.
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.
5L1 : FRONT SUB SENSOR (LH) AND
FRONT SUB SENSOR HARNESS (LH)
INSPECTION
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 (3I) terminal.
Connector & terminal
(3I) No. 1 Ð No. 3:
B5M0557B
:Is the resistance between 750Wand
1k
W?
: Go to step5L2.
: Go to step5L4.
32
5-5[T5K12]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5L2 : FRONT SUB SENSOR (LH) AND
FRONT SUB SENSOR HARNESS (LH)
INSPECTION
Measure resistance across test harness I or I2
connector (3I) terminal and chassis ground.
Connector & terminal
(3I) No. 1 (+) Ð Chassis ground (þ):
B5M0558B
:Is the resistance more than 10 kW?
: Go to step5L3.
: Go to step5L4.
5L3 : FRONT SUB SENSOR (LH) AND
FRONT SUB SENSOR HARNESS (LH)
INSPECTION
Measure resistance across test harness I or I2
connector (3I) terminal and chassis ground.
Connector & terminal
(3I) No. 3 (+) Ð Chassis ground (þ):
B5M0559B
:Is the resistance more than 10 kW?
: Replace airbag control module. 5-5 [W6A0].>
: Go to step5L4.5L4 : FRONT SUB SENSOR (LH) INSPEC-
TION
1) Connect test harness H connector (2H) and
front sub sensor (LH).
2) Measure resistance between test harness H
connector (3H) terminal.
Connector & terminal
(3H) No. 3 Ð No. 4:
B5M0566A
:Is the resistance between 750Wand
1k
W?
: Go to step5L5.
: Replace front sub sensor (LH). 5-5 [W9A0].>
5L5 : FRONT SUB SENSOR (LH) INSPEC-
TION
Measure resistance across test harness H connec-
tor (3H) terminal and chassis ground.
Connector & terminal
(3H) No. 3 (+) Ð Chassis ground (þ):
B5M0567A
:Is the resistance less than 10 kW?
: Go to step5L6.
: Replace front sub sensor (LH). 5-5 [W9A0].>
33
[T5L5]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code