sensor SUBARU LEGACY 1996 Service Repair Manual

G5M0291
1. Precaution
1) If any of the airbag system parts such as sensors, air-
bag module, airbag control module and harness are dam-
aged or deformed, replace with new genuine parts.
G5M0292
2) When servicing, be sure to turn the ignition switch off,
disconnect the negative () battery terminal then the posi-
tive (+) terminal in advance, and wait for more than 20
seconds before starting work.
G5M0293
3) When checking the system, be sure to use a digital cir-
cuit tester. Use of an analog circuit tester may cause the
airbag to activate erroneously. Do not directly apply the
tester probe to any connector terminal of the airbag. When
checking, use a test harness.
G5M0294
4
5-5SERVICE PROCEDURE
1. Precaution

G5M0311
3. FRONT SENSOR
Inspection standard:
Check the front section (Refer to shaded area of vehicle
in figure) for damage, regardless of whether or not airbag
is deployed.
Check whether or not the designated trouble code is
output during self-diagnosis. (Refer to“Diagnostics”Sec-
tion.)
Replacement standard:
Bracket is deformed.
Housing is cracked or deformed.
The label (that identifies the manufacturing number) is
peeled or deteriorated.
Harness circuit is broken, lead wire is exposed, corru-
gated tube is cracked, etc.
Front sensor determined as faulty as a result of Diag-
nostics.
Airbag is deployed.
Front sensor dropped to the floor/ground.
4. MAIN HARNESS
Inspection standard:
A vehicle damaged in a collision (regardless of whether
or not airbag is deployed).
The designated trouble code is output during self-diag-
nosis. (Refer to“Diagnostics”Section.)
Replacement standard:
Harness circuit is broken, lead wire is exposed, corru-
gated tube is cracked, etc.
Connector is scratched or cracked.
The designated trouble code is output during self-diag-
nosis.
5. AIRBAG CONTROL MODULE
Inspection standard:
A vehicle damaged in a collision (regardless of whether
or not airbag is deployed).
The designated trouble code is output during self-diag-
nosis. (Refer to“Diagnostics”Section.)
Replacement standard:
Control module is cracked or deformed.
Mounting bracket is cracked or deformed.
Connector is scratched or cracked.
Control module dropped to the floor/ground.
Control module determined as faulty during diagnostics.
Airbag is deployed.
7
5-5SERVICE PROCEDURE
2. Inspection and Replacement Standards

B5M0098
2) Remove four bolts and then carefully remove airbag
module.
3) Refer to“CAUTION”for handling of a removed airbag
module.
B: INSTALLATION
Installation is in reverse order of removal procedures.
Observe the following: Make sure that ignition switch is off.
CAUTION:
Do not allow harness and connectors to interfere or
get caught with other parts.
G5M0291
4. Front Sensor
CAUTION:
If the front end of the vehicle body is damaged by a
collision, be sure to check the left and right front
sensors, even if the airbag was not inflated. If any dam-
age to the sensor or any deformation of the sensor
mount is found, replace with a new genuine part.
G5M0310
When painting or performing sheet metal work on
the front part of vehicle body, including the front wheel
apron, front fender and front side frame, take utmost
care not to apply dryer heat, painting mist, or the flame
of the welding burner directly to the front sensors and
wire harness of the airbag system.
A: REMOVAL
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait for at
least 20 seconds before starting work.
13
5-5SERVICE PROCEDURE
3. Airbag Module - 4. Front Sensor

B5M0098
2) Remove four bolts and then carefully remove airbag
module.
3) Refer to“CAUTION”for handling of a removed airbag
module.
B: INSTALLATION
Installation is in reverse order of removal procedures.
Observe the following: Make sure that ignition switch is off.
CAUTION:
Do not allow harness and connectors to interfere or
get caught with other parts.
G5M0291
4. Front Sensor
CAUTION:
If the front end of the vehicle body is damaged by a
collision, be sure to check the left and right front
sensors, even if the airbag was not inflated. If any dam-
age to the sensor or any deformation of the sensor
mount is found, replace with a new genuine part.
G5M0310
When painting or performing sheet metal work on
the front part of vehicle body, including the front wheel
apron, front fender and front side frame, take utmost
care not to apply dryer heat, painting mist, or the flame
of the welding burner directly to the front sensors and
wire harness of the airbag system.
A: REMOVAL
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait for at
least 20 seconds before starting work.
13
5-5SERVICE PROCEDURE
3. Airbag Module - 4. Front Sensor

G5M0312
3) Remove lower cover.
Disconnect airbag connector (AB3) and (AB8) below steer-
ing column.
CAUTION:
Do not reconnect airbag connector at steering column
until front sensors are securely re-installed.
G5M0313
4) Remove console box. Discon-
nect 2-pin blue connector (AB4) (right side front sensor)
and 2-pin orange connector (AB5) (left side front sensor)
from airbag control module.
G5M0314
5) Roll up floor mat and side sill cover. [W5A10].> Remove front sensor harness from clip and pro-
tector.
6) Remove front wheels.
7) Remove front mud guard.
G5M0315
8) Remove wiring harness clips.
G5M0316
9) Remove grommet.
14
5-5SERVICE PROCEDURE
4. Front Sensor

B5M0102
10) Remove front sensor.
B: INSTALLATION
Installation is in reverse order of removal procedures.
5. Main Harness
A: REMOVAL
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait for at
least 20 seconds before starting work.
G5M0312
3) Remove lower cover.
Disconnect airbag connector (AB3) and (AB8) below steer-
ing column.
CAUTION:
Do not reconnect airbag connector at steering column
until main harness are securely re-installed.
G5M0313
4) Remove console box. Discon-
nect 12-pin yellow connector (AB6) from airbag control
module.
15
5-5SERVICE PROCEDURE
4. Front Sensor - 5. Main Harness

B5M0102
10) Remove front sensor.
B: INSTALLATION
Installation is in reverse order of removal procedures.
5. Main Harness
A: REMOVAL
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait for at
least 20 seconds before starting work.
G5M0312
3) Remove lower cover.
Disconnect airbag connector (AB3) and (AB8) below steer-
ing column.
CAUTION:
Do not reconnect airbag connector at steering column
until main harness are securely re-installed.
G5M0313
4) Remove console box. Discon-
nect 12-pin yellow connector (AB6) from airbag control
module.
15
5-5SERVICE PROCEDURE
4. Front Sensor - 5. Main Harness

G5M0291
1. Precaution
1) If any of the airbag system parts such as sensors, air-
bag module, airbag control module and harness are dam-
aged or deformed, replace with new genuine parts.
G5M0292
2) When servicing, be sure to turn the ignition switch off,
disconnect the negative () battery terminal then the posi-
tive (+) terminal in advance, and wait for more than 20
seconds before starting work.
G5M0293
3) When checking the system, be sure to use a digital cir-
cuit tester. Use of an analog circuit tester may cause the
airbag to activate erroneously. Do not directly apply the
tester probe to any connector terminal of the airbag. When
checking, use a test harness.
G5M0294
4
5-5bSERVICE PROCEDURE
1. Precaution

G5M0311
3. FRONT SENSOR
Inspection standard:
Check the front section (Refer to shaded area of vehicle
in figure) for damage, regardless of whether or not airbag
is deployed.
Check whether or not the designated trouble code is
output during self-diagnosis. (Refer to“Diagnostics”Sec-
tion.)
Replacement standard:
Bracket is deformed.
Housing is cracked or deformed.
The label (that identifies the manufacturing number) is
peeled or deteriorated.
Harness circuit is broken, lead wire is exposed, corru-
gated tube is cracked, etc.
Front sensor determined as faulty as a result of Diag-
nostics.
Airbag is deployed.
Front sensor dropped to the floor/ground.
4. MAIN HARNESS
Inspection standard:
A vehicle damaged in a collision (regardless of whether
or not airbag is deployed).
The designated trouble code is output during self-diag-
nosis. (Refer to“Diagnostics”Section.)
Replacement standard:
Harness circuit is broken, lead wire is exposed, corru-
gated tube is cracked, etc.
Connector is scratched or cracked.
The designated trouble code is output during self-diag-
nosis.
5. AIRBAG CONTROL MODULE
Inspection standard:
A vehicle damaged in a collision (regardless of whether
or not airbag is deployed).
The designated trouble code is output during self-diag-
nosis. (Refer to“Diagnostics”Section.)
Replacement standard:
Control module is cracked or deformed.
Mounting bracket is cracked or deformed.
Connector is scratched or cracked.
Control module dropped to the floor/ground.
Control module determined as faulty during diagnostics.
Airbag is deployed.
7
5-5bSERVICE PROCEDURE
2. Inspection and Replacement Standards

B6M0557A
2) Disconnect mass air flow sensor connector.
3) Remove four clips securing air cleaner upper cover.
B6M0558
4) Loosen the clamp screw and separate air cleaner upper
cover from air intake duct.
5) Remove air cleaner element.
B6M0559A
6) Remove #3 spark plug cord by pulling boot, not cord
itself.
B6M0560
7) Remove spark plug with the spark plug socket.
8) Installation is in the reverse order of removal.
Tightening torque (Spark plug):
20.6±2.9 N⋅m (2.10±0.30 kg-m, 15.19±2.14 ft-lb)
26
6-1SERVICE PROCEDURE
3. Spark Plug