1996 SUBARU LEGACY sensor

F: TROUBLE CODE 21
DIAGNOSIS:
Airbag control module is faulty.
1. Check if trouble code 21 is indicated.
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground
terminal, and then wait at least 20 seconds. 5-5b [W5A0].>
1. CHECK IF TROUBLE CODE 21 IS INDICATED.
Confirm flashing trouble code according to 5-5b [T4A0]
“BASIC DIAGNOSTICS PROCEDURE”.
: Is airbag warning light trouble code 21 indi-
cated?
: Replace airbag control module.
: Clear memory.
24
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

G: TROUBLE CODE 22
DIAGNOSIS:
Airbag main harness circuit is open.
Airbag module harness (Passenger) circuit is open.
Airbag control module is faulty.
1. Airbag main harness inspection
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground
cable and then wait at least 20 seconds.
B5M0120A
1. AIRBAG MAIN HARNESS INSPECTION
1) Remove front pillar lower trim (Passenger side). to 5-3 [W5A1].>, disconnect connector (AB9) and (AB10)
and connect connector (AB9) to test harness C connector
(1C).
G5M0559
2) Disconnect connector (AB6)
from airbag control module, and connect it to test harness
B2 connector (8B) terminal.
3) Measure resistance between test harness B2 connec-
tor (5B) and test harness C connector (3C) terminals.
: Connector & terminal
(5B) No. 6—(3C) No. 4:
Is resistance less than 10Ω?
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 7—(3C) No. 3:
Is resistance less than 10Ω?
: Replace airbag control module.
: Replace airbag main harness.
25
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

H: TROUBLE CODE 31
DIAGNOSIS:
Airbag control module is faulty.
Airbag main harness circuit is open.
Fuse No. 16 is blown.
Body harness circuit is open.
1. Airbag control module inspection
2. Airbag main harness inspection
3. Fuse No. 16 inspection
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, 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).
G5M0559
1. AIRBAG CONTROL MODULE INSPECTION
1) Disconnect connector (AB6) from airbag control module
, and connect it to test harness B2
connector (8B).
2) Connect battery ground cable and turn ignition switch
“ON”(engine off).
3) Measure voltage across connector (5B) terminal and
chassis ground.
: Connector & terminal
(5B) No. 5 (+)—Chassis ground ():
Is voltage more than 10 V?
: Replace airbag control module.
: Go to step2.


26
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

2. AIRBAG MAIN HARNESS INSPECTION
1) Go to step 2) below after performing diagnostics on air-
bag system as per diagnosis procedure under“1. AIRBAG
CONTROL MODULE INSPECTION”previously outlined.
2) Turn ignition switch“OFF”, disconnect battery ground
cable and then wait at least 20 seconds.
B5M0119B
3) Disconnect connector (AB1) from body harness con-
nector (B31) at front lower pillar (driver side), and connect
connector (AB1) to test harness A connector (2A).
4) Measure resistance between test harness A connector
(5A) and test harness B2 connector (5B) terminals.
: Connector & terminal
(5A) No. 9—(5B) No. 5:
Is resistance less than 10Ω?
: Go to step 5).
: Replace airbag main harness.
5) Measure resistance between each terminal of connec-
tors (5A) and (5B) and chassis ground.
: Connector & terminal
(5A) No. 9 (+)—Chassis ground ():
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 5 (+)—Chassis ground ():
Is resistance more than 10 kΩ?
: Go to step3.
: Replace airbag main harness.
G5M0453
3. FUSE No. 16 INSPECTION
Make sure ignition switch is turned“OFF”, then remove and
visually check fuse No. 16.
: Is fuse No. 16 blown?
: Replace fuse No. 16. If fuse No. 16 blows again,
repair body harness.
: Repair body harness.
27
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

I: TROUBLE CODE 33
DIAGNOSIS:
Airbag module is inflated.
1. Check if trouble code 33 is indicated.
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground
terminal, and then wait at least 20 seconds. 5-5b [W5A0].>
1. CHECK IF TROUBLE CODE 33 IS INDICATED.
Confirm flashing trouble code according to 5-5b [T4A0]
“BASIC DIAGNOSTICS PROCEDURE”.
: Is airbag warning light trouble code 33 indi-
cated?
: Replace airbag control module.
: Clear memory.
28
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

J: TROUBLE CODE 34
DIAGNOSIS:
Airbag main harness circuit (Passenger) is shorted to
power supply.
Airbag module harness (Passenger) is shorted to power
supply.
Airbag control module is faulty.
1. Airbag main harness inspection
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, disconnect battery ground ter-
minal and then wait at least 20 seconds.
After 20 seconds elapse, remove instrument panel
lower cover, and disconnect (AB3) and (AB8), (AB9)
and (AB10).
G5M0559
1. AIRBAG MAIN HARNESS INSPECTION
1) Disconnect connector (AB6) from airbag control module
, and connect it to test harness B2
connector (8B).
2) Connect battery ground cable and turn ignition switch
“ON”(engine off).
3) Measure voltage across each test harness B2 connec-
tor (5B) terminal and chassis ground.
: Connector & terminal
(5B) No. 6 (+)—Chassis ground ():
Is voltage less than 1 V?
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 7 (+)—Chassis ground ():
Is voltage less than 1 V?
: Replace airbag control module.
: Replace airbag main harness.
29
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

K: TROUBLE CODE 41
DIAGNOSIS:
Airbag main harness circuit (Driver) is shorted to ground.
Airbag module harness (Driver) is shorted to ground.
Roll connector circuit is shorted to ground.
Airbag control module is faulty.
1. Airbag main harness inspection
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, 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).
G5M0559
1. AIRBAG MAIN HARNESS INSPECTION
1) Disconnect connector (AB6) from airbag control module
, and connect it to test harness B2
connector (8B).
2) Measure resistance between test harness B2 connec-
tor (5B) terminals and chassis ground.
: Connector & terminal
(5B) No. 1 (+)—Chassis ground ():
Is resistance more than 200Ω?
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 14 (+)—Chassis ground ():
Is resistance more than 200Ω?
: Replace airbag control module.
: Replace airbag main harness.
30
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code

L: TROUBLE CODE 42
DIAGNOSIS:
Airbag main harness circuit (Passenger) is shorted to
ground.
Airbag module harness circuit (Passenger) is shorted to
ground.
Airbag control module is faulty.
1. Airbag main harness inspection
CAUTION:
Before performing diagnostics on airbag system, turn
ignition switch“OFF”, 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).
G5M0559
1. AIRBAG MAIN HARNESS INSPECTION
1) Disconnect connector (AB6) from airbag control module
, and connect it to test harness B2
connector (8B).
2) Measure resistance between test harness B2 connec-
tor (5B) terminals and chassis ground.
: Connector & terminal
(5B) No. 6 (+)—Chassis ground ():
Is resistance more than 200Ω?
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 7 (+)—Chassis ground ():
Is resistance more than 200Ω?
: Replace airbag control module.
: Replace airbag main harness.
31
5-5bSUPPLEMENTAL RESTRAINT SYSTEM (ELECTRIC SENSOR TYPE)
5. Diagnostics Chart with Trouble Code