1999 SUBARU LEGACY Service Repair Manual

G: STEERING WHEEL
1. INSPECTION STANDARD
A vehicle damaged in a collision (regardless of
whether or not airbag is deployed).
2. REPLACEMENT STANDARD
ICheck steering wheel insert for cracks or defor-
mities.
ICheck to ensure that new airbag module is prop-
erly installed in steering wheel.
IAfter installing airbag module, check to ensure
that it is free of interference with steering wheel
and that clearance between the two is equal at all
points.
B5M0095
H: STEERING COLUMN ASSEMBLY
1. INSPECTION STANDARD
A vehicle damaged in a collision (regardless of
whether or not airbag is deployed).
2. REPLACEMENT STANDARD
ICheck steering wheel free play in axial and
radial directions.
Specifications:
Axial free play A
Less than
±6 mm (0.24 in)
Radial free play L
Less than
±7 mm (0.28 in)
B5M0096A
ICheck to ensure that clearance between cap-
sule (A) (at steering column) and cutout portion of
column bracket (B) on steering column upper side
is within specifications.
Clearance between capsule and cutout por-
tion of column bracket: L
Less than 0.5 mm (0.020 in)
B5M0097C
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[W2H2]5-5SERVICE PROCEDURE
2. Inspection and Replacement Standards

I: FRONT SUB SENSOR
1. INSPECTION STANDARD
ICheck the front section (Refer to shaded area of
vehicle in figure) for damage, regardless of
whether or not airbag is deployed.
G5M0311
IThe designated trouble code is output during
self-diagnosis.
2. REPLACEMENT STANDARD
IBracket is deformed.
IHousing is cracked or deformed.
IThe label (that identifies the manufacturing num-
ber) is peeled or deteriorated.
IHarness circuit is broken, lead wire is exposed,
corrugated tube is cracked, etc.
IFront sub sensor determined as faulty as a
result of Diagnostics.
IAirbag is deployed.
IFront sub sensor dropped to the floor/ground.
J: SIDE AIRBAG SENSOR
1. INSPECTION STANDARD
ICheck the side section (Refer to shaded area of
vehicle in figure) for damage, regardless of
whether or not airbag is deployed.
B5M0514
IThe designated trouble code is output during
self-diagnosis.
2. REPLACEMENT STANDARD
IBracket is deformed.
IHousing is cracked or deformed.
IThe label (that identifies the manufacturing num-
ber) is peeled or deteriorated.
IHarness circuit is broken, lead wire is exposed,
corrugated tube is cracked, etc.
ISide airbag sensor determined as faulty as a
result of Diagnostics.
IAirbag is deployed.
ISide airbag sensor dropped to the floor/ground.
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5-5[W2I1]SERVICE PROCEDURE
2. Inspection and Replacement Standards

3. Airbag Module
A: REMOVAL AND INSTALLATION
CAUTION:
IThe airbag module (driver, passenger and
side) must not be disassembled. The airbag
module cannot be used again once inflated.
G5M0299
IWhen removing and installing the airbag
module (driver, passenger and side), the opera-
tor should stand, as much as possible, on the
side of the airbag module.
G5M0300
IAfter removal, the airbag module (driver,
passenger and side) should be kept away from
heat and light sources, and stored on a clean,
flat surface to prevent from any damage to its
lower structure.
G5M0301
IDo not check airbag module (driver, passen-
ger and side) continuity with airbag removed
from the vehicle body.
G5M0302
IReplace airbag module (driver, passenger
and side) with a new one, should any of the
following conditions develop:
IPad surface is scratched or cracked.
IConnector harness is damaged.
IInflator side structure of module is
cracked or deformed.
IModule is excessively stained with water,
oil, etc.
IModule was accidentally dropped.
IThe front seat assembly is damaged or
deformed.
IThe removed front seat with the airbag mod-
ule must be kept on its back. At this time, keep
the module side at least 200 mm (7.87 in) away
from walls or other objects.
B5M0515A
IWhen storing a removed airbag module
(driver and passenger), be sure to place it in
parallel with floor with the pad facing up. Do
not place it against a wall, or place anything on
the pad; otherwise, a dangerous condition may
be created if the module malfunctions.
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[W3A0]5-5SERVICE PROCEDURE
3. Airbag Module

G5M0604
1. DRIVER'S AIRBAG MODULE
1) Set front wheels in straight ahead position.
2) Turn ignition switch off.
3) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.
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5-5[W3A1]SERVICE PROCEDURE
3. Airbag Module

4) Using TORXTBIT T30, remove two TORXT
bolts.
H5M0662A
5) Disconnect airbag connector on back of airbag
module.
H5M0664
6) Refer toªCAUTIONºfor handling of a removed
airbag module.
7) Installation is in the reverse order of removal.
CAUTION:
Do not allow harness and connectors to inter-
fere or get caught with other parts.
2. PASSENGER'S AIRBAG MODULE
1) Remove instrument panel. [W1A0].>
2) Remove four bolts and then carefully remove
airbag module.
B5M0098
3) Refer toªCAUTIONºfor handling of a removed
airbag module.
4) Installation is in the reverse order of removal.CAUTION:
Do not allow harness and connectors to inter-
fere or get caught with other parts.
3. SIDE AIRBAG MODULE
The side airbag module cannot be detached from
the front seat assembly. When replacing side air-
bag module, replace front seat assembly. 5-3 [W100].>
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[W3A3]5-5SERVICE PROCEDURE
3. Airbag Module

4. Main Harness
A: REMOVAL AND INSTALLATION
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.
3) Remove lower cover.
Disconnect airbag connector (AB3) and (AB8)
below steering column.
CAUTION:
Do not reconnect airbag connector at steering
column until main harness are securely re-in-
stalled.
G5M0312
4) Remove console box.
5) Disconnect connector from airbag control mod-
ule.
6) Disconnect body harness connector (B31) from
connector (AB1).
NOTE:
The following procedures for removal are for ªLHD
modelº. The procedures for ªRHD modelº are sym-
metrically opposite.
B5M0103B
7) Remove front side sill cover and then discon-
nect airbag connector (AB9) and (AB10). 5-5 [M2F2].>
B5M0029A
8) Roll up floor mat and side sill lower cover of
both side and then remove main harness.
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5-5[W4A0]SERVICE PROCEDURE
4. Main Harness

9) Disconnect front sub sensor connector (A), side
airbag sensor connector (B) (side airbag equipped
model) and then remove protector (C).
10) Detach clips and then remove airbag main
harness.
B5M0516A
11) Installation is in the reverse order of removal.
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[W4A0]5-5SERVICE PROCEDURE
4. Main Harness

5. Airbag Control Module
A: REMOVAL AND INSTALLATION
CAUTION:
IDo not disassemble the airbag control mod-
ule.
G5M0322
IIf the airbag control module is deformed, or
if water damage is suspected, replace the air-
bag control module with a new genuine part.
G5M0323
IAfter removal, keep the airbag control mod-
ule on a dry, clean surface away from heat and
light sources, and moisture and dust.
G5M0324
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.3) Remove lower cover.
Disconnect airbag connector (AB3) and (AB8)
below steering column.
CAUTION:
Do not reconnect airbag connector at steering
column until airbag control module is securely
re-installed.
G5M0312
4) Remove console box.
5) Disconnect connector from airbag control mod-
ule.
6) Using TORX
TBIT T40 (Tamper resistant type),
remove two TORXTbolts. Discard the old TORXT
bolts.
CAUTION:
Use new TORX
Tbolts during re-assembly.
B5M0105
7) Installation is in the reverse order of removal.
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5-5[W5A0]SERVICE PROCEDURE
5. Airbag Control Module