ignition SUBARU FORESTER 1999 Service Owner's Manual

5P2 : SIDE AIRBAG HARNESS (LH)
INSPECTION
1) Turn ignition switch OFF, disconnect battery
ground cable and then wait at least 20 seconds.
2) Disconnect test harness F and airbag resistor.
3) Disconnect connector (AB17) from airbag con-
trol module and connect it to test harness I or I2
connector (1I).
4) Connect battery ground cable and turn ignition
switch ON. (engine off)
5) Measure voltage across connector (3I) terminal
and chassis ground.
Connector & terminal
(3I) No. 10 (+) Ð Chassis ground (±):
B5M0525B
:Is the voltage less than 1 V?
: Go to step5P3.
: Replace side airbag harness (LH). to 5-5 [W5A0].>5P3 : SIDE AIRBAG HARNESS (LH)
INSPECTION
Measure voltage across connector (3I) terminal
and chassis ground.
Connector & terminal
(3I) No. 12 (+) Ð Chassis ground (±):
B5M0526B
:Is the voltage less than 1 V?
: Replace airbag control module. 5-5 [W6A0].>
: Replace side airbag harness (LH). to 5-5 [W5A0].>
45
[T5P3]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

Q: TROUBLE CODE 51
DIAGNOSIS:
ISide airbag sensor (RH) is faulty.
ISide airbag harness (RH) is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
5Q1 : SIDE AIRBAG HARNESS (RH)
INSPECTION
1) Disconnect connector (AB24) and (AB25) at
below front seat on RH side.
2) Disconnect connector (AB18) from airbag con-
trol module and connect it to test harness I or I2
connector (1I).
3) Disconnect connector (AB28) from side airbag
sensor (RH) and connect it to test harness G con-
nector (1G).
4) Measure resistance between test harness I or
I2 connector (3I) terminal and test harness G con-
nector (3G) terminal.
Connector & terminal
(3I) No. 17 Ð (3G) No. 2:
B5M0527B
:Is the resistance less than 10W?
: Go to step5Q2.
: Replace side airbag harness (RH).
5Q2 : SIDE AIRBAG HARNESS (RH)
INSPECTION
Measure resistance between test harness I or I2
connector (3I) terminal and test harness G connec-
tor (3G) terminal.
Connector & terminal
(3I) No. 19 Ð (3G) No. 5:
B5M0528B
:Is the resistance less than 10W?
: Go to step5Q3.
: Replace side airbag harness (RH).

5Q3 : SIDE AIRBAG HARNESS (RH)
INSPECTION
Measure resistance between test harness I or I2
connector (3I) terminal and test harness G connec-
tor (3G) terminal.
Connector & terminal
(3I) No. 18 Ð (3G) No. 1:
S5M0345A
:Is the resistance less than 10W?
: Go to step5Q4.
: Replace side airbag harness (RH).

46
5-5[T5Q0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5Q12 : SIDE AIRBAG HARNESS (RH)
INSPECTION
Measure resistance between connector (3I) termi-
nal and chassis ground.
Connector & terminal
(3I) No. 20 (+) Ð Chassis ground (±):
B5M0779A
:Is the resistance more than 1 MW?
: Go to step5Q13.
: Replace side airbag harness (RH).

5Q13 : SIDE AIRBAG HARNESS (RH)
INSPECTION
Measure resistance between connector (3I) termi-
nal and chassis ground.
Connector & terminal
(3I) No. 17 (+) Ð Chassis ground (±):
B5M0531B
:Is the resistance more than 1 MW?
: Go to step5Q14.
: Replace side airbag harness (RH).
5Q14 : SIDE AIRBAG HARNESS (RH)
INSPECTION
Measure resistance between connector (3I) termi-
nal and chassis ground.
Connector & terminal
(3I) No. 19 (+) Ð Chassis ground (±):
B5M0532B
:Is the resistance more than 1 MW?
: Replace side airbag sensor (RH). to 5-5 [W7A0].> Go to step5Q15.
: Replace side airbag harness (RH).

5Q15 : SIDE AIRBAG HARNESS (RH)
INSPECTION
1) Connect connector (AB24) and (AB25).
2) Connect connector (AB18) and airbag control
module.
3) Connect connector (AB28) and side airbag sen-
sor.
4) Connect battery ground cable and then turn
ignition switch to ON (engine OFF).
:Does the airbag warning light go off
after about 7 seconds and remain off
for more than 30 seconds?
: Perform clear memory. [T4C0].>
: Replace airbag control module. 5-5 [W6A0].>
49
[T5Q15]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

R: TROUBLE CODE 52
DIAGNOSIS:
ISide airbag sensor (LH) is faulty.
ISide airbag harness (LH) is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
5R1 : SIDE AIRBAG HARNESS (LH)
INSPECTION
1) Disconnect connector (AB19) and (AB20) at
below front seat on LH side.
2) Disconnect connector (AB17) from airbag con-
trol module and connect it to test harness I or I2
connector (1I).
3) Disconnect connector (AB23) from side airbag
sensor (LH) and connect it to test harness G con-
nector (1G).
4) Measure resistance between test harness I or
I2 connector (3I) terminal and test harness G con-
nector (3G) terminal.
Connector & terminal
(3I) No. 14 Ð (3G) No. 5:
B5M0533B
:Is the resistance less than 10W?
: Go to step5R2.
: Replace side airbag harness (LH). to 5-5 [W5A0].>5R2 : SIDE AIRBAG HARNESS (LH)
INSPECTION
Measure resistance between test harness I or I2
connector (3I) terminal and test harness G connec-
tor (3G) terminal.
Connector & terminal
(3I) No. 16 Ð (3G) No. 2:
B5M0534B
:Is the resistance less than 10W?
: Go to step5R3.
: Replace side airbag harness (LH). to 5-5 [W5A0].>
5R3 : SIDE AIRBAG HARNESS (LH)
INSPECTION
Measure resistance between test harness I or I2
connector (3I) terminal and test harness G connec-
tor (3G) terminal.
Connector & terminal
(3I) No. 15 Ð (3G) No. 1:
S5M0347A
:Is the resistance less than 10W?
: Go to step5R4.
: Replace side airbag harness (LH). to 5-5 [W5A0].>
50
5-5[T5R0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5R12 : SIDE AIRBAG HARNESS (LH)
INSPECTION
Measure resistance between connector (3I) termi-
nal and chassis ground.
Connector & terminal
(3I) No. 5 (+) Ð Chassis ground (±):
B5M0781A
:Is the resistance more than 1 MW?
: Go to step5R13.
: Replace side airbag harness (LH). to 5-5 [W5A0].>
5R13 : SIDE AIRBAG HARNESS (LH)
INSPECTION
Measure resistance between connector (3I) termi-
nal and chassis ground.
Connector & terminal
(3I) No. 14 (+) Ð Chassis ground (±):
B5M0537B
:Is the resistance more than 1 MW?
: Go to step5R14.
: Replace side airbag harness (LH). to 5-5 [W5A0].>5R14 : SIDE AIRBAG HARNESS (LH)
INSPECTION
Measure resistance between connector (3I) termi-
nal and chassis ground.
Connector & terminal
(3I) No. 16 (+) Ð Chassis ground (±):
B5M0538B
:Is the resistance more than 1 MW?
: Replace side airbag sensor (LH). to 5-5 [W7A0].> Go to step5R15.
: Replace side airbag harness (LH). to 5-5 [W5A0].>
5R15 : SIDE AIRBAG HARNESS (LH)
INSPECTION
1) Connect connector (AB19) and (AB20).
2) Connect connector (AB17) and airbag control
module.
3) Connect connector (AB23) and side airbag sen-
sor.
4) Connect battery ground cable and then turn
ignition switch to ON (engine OFF).
:Does the airbag warning light go off
after about 7 seconds and remain off
for more than 30 seconds?
: Perform clear memory. [T4C0].>
: Replace airbag control module. 5-5 [W6A0].>
53
[T5R15]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

S: TROUBLE CODE 53
DIAGNOSIS:
Side airbag sensor (RH) is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal, and then wait at least
20 seconds.
5S1 : CHECK IF TROUBLE CODE 53 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
53 indicated?
: Replace side airbag sensor (RH). to 5-5 [W7A0].>
: Perform clear memory. [T4C0].>
T: TROUBLE CODE 54
DIAGNOSIS:
Side airbag sensor (LH) is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal, and then wait at least
20 seconds.
5T1 : CHECK IF TROUBLE CODE 54 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
54 indicated?
: Replace side airbag sensor (LH). to 5-5 [W7A0].>
: Perform clear memory. [T4C0].>
54
5-5[T5S0]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

U: TROUBLE CODE 55
DIAGNOSIS:
Side airbag module is inflated.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
5U1 : CHECK IF TROUBLE CODE 55 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
55 indicated?
: Replace front seat with side airbag mod-
ule (Operating side) [W100].>, side airbag sensor (Operating
side) and airbag
control module.
: Perform clear memory. [T4C0].>
V: AIRBAG WARNING LIGHT
REMAINS ON.
DIAGNOSIS:
IAirbag warning light is faulty.
IAirbag control module to airbag warning light
harness circuit is shorted or open.
IGrounding circuit is faulty.
IAirbag control module is faulty.
I(AB1) and (B31) are not connected properly.
I(AB6) is not connected properly 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.
5V1 : CHECK POOR CONTACT IN CON-
NECTORS (AB1) AND (B31).
1) Remove front pillar lower trim (Driver side).
2) Check poor contact in connectors (AB1) and
(B31).
B5M0122B
:Is there poor contact in double lock
of connectors (AB1) and (B31)?
: Repair poor contact in double lock of
connectors (AB1) and (B31).
: Go to step5V2.
55
[T5V1]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5V2 : INSPECTION OF AIRBAG WARNING
LIGHT
1) Turn ignition switch ªOFFº and connect body
harness connector (B31) to test connector A con-
nector (1A).
S5M0282A
2) Connect battery ground cable and turn ignition
switch ªONº, (engine off) and connect connectors
(3A) and (4A).
G5M0455
:Does the airbag warning light come
off?
: Go to step5V4.
: Go to step5V3.5V3 : INSPECTION OF BODY HARNESS
Check body harness.
NOTE:
After problem has been eliminated, disconnect
connectors (3A) and (4A).
S5M0283A
:Is there anything unusual to body
harness?
: Repair body harness.
: Replace airbag warning light bulb to 6-2 [W8B0].> or combination meter
printed circuit.
5V4 : CHECK POOR CONTACT IN CON-
NECTOR (AB6).
Check connector (AB6) connected to airbag con-
trol module.
:Is there poor contact in connector
(AB6)?
: Repair poor contact in connector (AB6).
: Go to step5V5.
56
5-5[T5V2]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5V5 : INSPECTION OF AIRBAG MAIN HAR-
NESS
1) Turn ignition switch ªOFFº, disconnect battery
ground cable and then wait at least 20 seconds,
and re-connect connectors (AB1) and (B31).
2) Remove instrument panel lower cover and dis-
connect (AB3) with (AB8) and (AB9) with (AB10),
then disconnect connector (AB6) from airbag con-
trol module, and connect it
to test harness I or I2 connector (1I).
3) Connect battery ground cable and turn ignition
switch ªONº, (engine off) and connect connectors
(4I) and (5I).
NOTE:
After problem has been eliminated, disconnect
connectors (4I) and (5I).
S5M0268B
:Does the airbag warning light come
off?
: Go to step5V6.
: Replace airbag main harness. 5-5 [W4A0].>5V6 : GROUNDING CIRCUIT INSPECTION
1) Turn ignition switch ªOFFº, disconnect battery
ground cable and then wait at least 20 seconds.
2) Disconnect connector (AB1) from body harness
connector (B31), and connect connector (B31) to
test harness A connector (1A).
3) Measure resistance between connector (5A)
terminal and chassis ground.
Connector & terminal
(5A) No. 17 (+) Ð Chassis ground (þ):
S5M0269A
:Is resistance less than 10W?
: Go to step5V7.
: Repair body grounding circuit.
5V7 : GROUNDING CIRCUIT INSPECTION
Measure resistance between connector (5A) termi-
nal and chassis ground.
Connector & terminal
(5A) No. 18 (+) Ð Chassis ground (þ):
S5M0270A
:Is resistance less than 10W?
: Go to step5V8.
: Repair body grounding circuit.
57
[T5V7]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

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