1999 SUBARU FORESTER Service Repair Manual

5V8 : INSPECTION OF AIRBAG MAIN HAR-
NESS
1) Connect connectors (AB1) and (B31). Discon-
nect connector (AB6) from airbag control module
, and connect it to test har-
ness I or I2 connector (1I).
2) Measure resistance between each test harness
I or I2 connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 9 (+) Ð Chassis ground (þ):
S5M0271B
:Is resistance less than 10W?
: Go to step5V9.
: Replace airbag main harness. 5-5 [W4A0].>
5V9 : INSPECTION OF AIRBAG MAIN HAR-
NESS
Measure resistance between each test harness I
or I2 connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 10 (+) Ð Chassis ground (þ):
S5M0272B
:Is resistance less than 10W?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
W: AIRBAG WARNING LIGHT
REMAINS OFF.
DIAGNOSIS:
IFuse No. 5 (in main fuse box) is blown.
IBody harness circuit is open.
IAirbag warning light is faulty.
IAirbag main harness 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.
5W1 : FUSE NO. 5 (IN MAIN FUSE BOX)
INSPECTION
Remove and visually check fuse No. 5 (In main
fuse box).
S5M0273A
:Is fuse No. 5 blown?
: Replace fuse No. 5. If fuse No. 5 blows
again, Go to step5W2.
: Go to step5W2.
5W2 : BODY HARNESS INSPECTION
Turn ignition switch ªONº (engine off) to make sure
other warning lights (in combination meter) illumi-
nate.
:Do all the warning lights (in combina-
tion meter) except airbag warning
light come on?
: Go to step5W3.
: Repair body harness.
58
5-5[T5V8]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5W3 : AIRBAG WARNING LIGHT MODULE
(IN COMBINATION METER) INSPEC-
TION
1) Turn ignition switch ªOFFº, disconnect battery
ground cable and then wait at least 20 seconds.
2) Disconnect body harness connector (B31) from
connector (AB1) located at front pillar lower (driver
side).
B5M0122B
3) Connect battery ground cable and turn ignition
switch ªONº (engine off) to make sure airbag warn-
ing light illuminates.
S5M0283A
:Does the airbag warning light come
on?
: Go to step5W4.
: Replace airbag warning light bulb to 6-2 [W8B0].> or combination meter
printed circuit.5W4 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Turn ignition switch ªOFFº, disconnect battery
ground cable and then wait at least 20 seconds.
2) Connect body harness connector (B31) and
connector (AB1).
3) Disconnect connector (AB6) from airbag control
module.
4) Connect battery ground cable and turn ignition
switch ªONº to make sure airbag warning light illu-
minates.
:Does the airbag warning light come
on?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
59
[T5W4]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

X: WARNING LIGHT INDICATES
TROUBLE CODE, THEN NORMAL
CODE. (FLASHING TROUBLE
CODE.)
DIAGNOSIS:
Airbag system component parts are faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable, and then wait at least 20
seconds.5X1 : AIRBAG COMPONENT PARTS
APPEARANCE INSPECTION
1) Conduct on-board diagnostic and call up
trouble codes stored in memory. [T4B0].>
2) Select trouble code required to check airbag
component parts from those listed in table and
reproduce symptom.
Trouble codes Check parts Index. No.
11IRoll connector
IAirbag module (Driver)
IAirbag main harness
IAirbag control module



12IAirbag module (Passenger)
IAirbag main harness
IAirbag control module


15IAirbag module (Driver)
IRoll connector
IAirbag main harness
IAirbag control module



16IAirbag main harness
IAirbag module (Passenger)
IAirbag control module


21 Airbag control module
22 Airbag control module
25IFuse No. 6
IAirbag main harness
IAirbag control module
IBody harness



26 Side airbag module (LH) in front seat
31IAirbag main harness
IFront sub sensor and front sub sensor harness (RH)

32IAirbag main harness
IFront sub sensor and front sub sensor harness (LH)

41 Side airbag module (RH) in front seat
42 Side airbag module (LH) in front seat
45IAirbag control module
ISide airbag module (RH) in front seat

46IAirbag control module
ISide airbag module (LH) in front seat

51ISide airbag sensor (RH)
IAirbag control module

52ISide airbag sensor (LH)
IAirbag control module

53 Side airbag sensor (RH)
54 Side airbag sensor (LH)
55 Side airbag module in front seat
60
5-5[T5X0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

3) Conduct appearance inspection on parts
selected.
NOTE:
Also check connector terminals, wiring harness,
case, etc. for damage.
:Is there anything unusual about the
appearance of airbag component
parts?
: Replace faulty airbag component parts.
: Go to step5X2.
5X2 : AIRBAG COMPONENT PARTS
VIBRATION INSPECTION
1) Gently shake check parts (to determine faults.).
2) To check airbag module or roll connector, turn
and tilt steering wheel.
CAUTION:
Do not shake or vibrate airbag control module.
:Does the component malfunction
again when shaking?
: Replace faulty airbag component parts.
: Go to step5X3.
5X3 : SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on airbag compo-
nents.
NOTE:
Also check wiring harnesses as water may leak
along them and get airbag component parts wet.
G5M0461
:Does water leak into the passenger
compartment when showering
vehicle?
: Replace faulty airbag component parts.
: Perform clear memory. [T4C0].>
Y: WARNING LIGHT INDICATES
TROUBLE CODE, THEN NORMAL
CODE. (FLASHING NORMAL CODE.)
DIAGNOSIS:
IAirbag connector is faulty.
IFuse No. 11 (in joint box) is blown.
IAirbag main harness is faulty.
IAirbag control module is faulty.
IBody harness is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable, and then wait at least 20
seconds.
5Y1 : AIRBAG CONNECTOR APPEARANCE
INSPECTION
Conduct appearance inspection on airbag connec-
tors (AB1) through (AB28).
NOTE:
Check terminals, case and wiring harnesses for
damage.
:Is there anything unusual about the
appearance of connectors (AB1)
through (AB28)?
: Replace faulty airbag component parts.
: Go to step5Y2.
5Y2 : AIRBAG CONNECTOR VIBRATION
INSPECTION
Conduct vibration inspection on airbag connectors
(AB1) through (AB28).
NOTE:
Gently shake each airbag connector.
:Do the connectors (AB1) through
(AB28) malfunction again when shak-
ing?
: Replace faulty airbag component parts.
: Go to step5Y3.
61
[T5Y2]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5Y3 : SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on airbag compo-
nents.
NOTE:
If leaks are noted, also check wiring harnesses as
water may leak along them and wet airbag connec-
tors.
G5M0461
:Does water leak into the passenger
compartment when showering
vehicle?
: Replace faulty airbag component parts.
: Go to step5Y4.
5Y4 : FUSE NO. 11 (IN JOINT BOX), AIR-
BAG MAIN HARNESS, AIRBAG CON-
TROL MODULE, BODY HARNESS
APPEARANCE INSPECTION
Conduct appearance inspection on fuse No. 11
, airbag main harness 5-5 [W4A0].>, airbag control module [W6A0].> and body harness.
NOTE:
Also check connectors, terminals, wiring harness
and case for damage.
:Is there anything unusual about the
appearance of fuse No. 11, airbag
main harness, airbag control module
or body harness?
: Replace faulty airbag component parts.
: Go to step5Y5.5Y5 : FUSE NO. 11 (IN JOINT BOX), AIR-
BAG MAIN HARNESS, BODY HAR-
NESS VIBRATION INSPECTION
Conduct vibration inspection on fuse No. 11, airbag
main harness and body harness.
CAUTION:
Do not shake or vibrate airbag control module.
NOTE:
Gently shake each part.
:Do fuse No. 11, airbag main harness
or body harness malfunction again
when shaking?
: Replace faulty airbag component parts.
: Go to step5Y6.
5Y6 : SHOWERING INSPECTION TO BODY
Spray water on vehicle body.
CAUTION:
Do not directly spray water on each part.
NOTE:
If leaks are noted, check wiring harnesses as water
may leak along them and get parts wet.
G5M0461
:Does water leak into the passenger
compartment when showering
vehicle?
: Replace faulty airbag component parts.
: Go to step5Y7.
62
5-5[T5Y3]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5Y7 : WARNING LIGHT ILLUMINATION
CHECK
Turn ignition switch ªONº (engine off) and observe
airbag warning light.
:Does the airbag warning light come
on for about 7 seconds, then go out
and stay out?
: Perform clear memory. [T4C0].>
: Go to ªDIAGNOSTICS PROCEDUREº.

63
[T5Y7]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

MEMO:
64
5-5DIAGNOSTICS

1. Combination Meter
A: DIAGNOSTICS PROCEDURE
If speedometer does not operate, or operates
abnormally, check combination meter circuit.
CAUTION:
Make sure that trouble code of vehicle speed
sensor system appears in electrical system on-
board diagnosis.
1A1 : CHECK POWER SUPPLY FOR COM-
BINATION METER.
1) Remove combination meter. [W8A0].>
2) Turn ignition switch to ON.
3) Measure voltage between combination meter
connector and chassis ground.
Connector & terminal
(i10) No. 1 (+) Ð Chassis ground (þ):
S6M0430A
:Is the voltage more than 10 V?
: Go to step1A2.
: Repair harness and connector.
NOTE:
In this case, repair the following:
IOpen circuit in harness between combination
meter and battery.
IPoor contact in coupling connectors (i10) and
combination meter connector. WORD [W3C0].>1A2 : CHECK POWER SUPPLY FOR COM-
BINATION METER.
Measure voltage between combination meter con-
nector and chassis ground.
Connector & terminal
(i10) No. 2 (+) Ð Chassis ground (þ):
S6M0431A
:Is the voltage more than 10 V?
: Go to step1A3.
: Repair harness and connector.
NOTE:
In this case, repair the following:
IOpen circuit in harness between combination
meter and battery.
IPoor contact in coupling connectors (i10) and
combination meter connector. WORD [W3C0].>
1A3 : CHECK GROUND CIRCUIT OF COM-
BINATION METER.
1) Turn ignition switch to OFF.
2) Measure resistance of harness between com-
bination meter connector and chassis ground.
Connector & terminal
(i10) No. 3 (+) Ð Chassis ground (þ):
S6M0432A
:Is the resistance less than 10W?
: Go to step1A4.
: Repair harness and connector.
2
6-2[T1A0]DIAGNOSTICS
1. Combination Meter