sensor SUBARU LEGACY 1996 Service Repair Manual

Trouble code/Contents of troubles Memory function Contents of diagnosis Page
Airbag warning light remains on. Not provided.1) Airbag warning light is faulty.
2) Airbag control module to airbag warning light
harness circuit is shorted or open.
3) Grounding circuit is faulty.
4) Airbag control module is faulty.
5) (AB1) and (B39) are not connected properly.33
Airbag warning light remains off. Not provided.1) Fuse No. 15 is blown.
2) Body harness circuit is open.
3) Airbag warning light is faulty.
4) Airbag main harness is faulty.
5) Airbag control module is faulty.36
Warning light indicates trouble code,
then normal code. (Flashing trouble
code.)Provided. Airbag system component parts are faulty. 38
Warning light indicates trouble code,
then normal code. (Flashing normal
code.)Not provided.1) Airbag connector is faulty.
2) Fuse No. 16 is blown.
3) Airbag main harness is faulty.
4) Airbag control module is faulty.
5) Body harness is faulty.41
[NOTE] Dr: Driver side Ps: Passenger side
2. HOW TO READ TROUBLE CODES
The AIRBAG warning light flashes a code corresponding to
the faulty parts.
The long segment (1.2 sec on) indicates a“ten”, and the
short segment (0.3 sec on) indicates a“one”.
B5M0117A
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4. Diagnostics Chart for On-board Diagnostic System

E: DIAGNOSTICS PROCEDURE
1. AIRBAG WARNING LIGHT STAYS ON AFTER 8
SECONDS.
1) Perform on-board diagnostic.
2) Are trouble codes 4, 12, 13, 22, 34, 41, 42 or 43 indi-
cated?
Record trouble codes. If“YES”proceed to step 4). If“NO”
proceed to step 3).
3) Proceed with diagnostics and repair according to
trouble code indicated then perform step 15).
4) If codes 4, 22, 34, 42 are indicated, proceed to step 5).
If codes 4, 22, 34, 42 are not indicated, proceed to step
10).
5) If codes 12, 13, 41, 43 are indicated, proceed to step 6).
If codes 12, 13, 41, 43 are not indicated, proceed to step
11).
G5M0589
G5M0429
6) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Disconnect passenger side
airbag module connector (AB9) to (AB10). [W3A2].> Connect test harness C connector (1C) to (AB9).
Connect airbag resistor to test harness C connector (3C).
Remove lower cover panel and connect test harness C
connector (1C) to (AB8) with airbag
resistor attached to test harness C connector (3C).
Connect battery ground cable and turn ignition switch
“ON”. Does airbag warning light go“OFF”after 8 seconds
and remain off for more than 30 seconds?
See“NOTE:”.
If“YES”proceed to step 7).
If“NO”proceed to step 3).
G5M0429
7) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Connect passenger side air-
bag module connector (AB9) to (AB10). Connect battery
ground cable and turn ignition switch“ON”. Does airbag
warning light go“OFF”after 8 seconds and remain off for
more than 30 seconds?
See“NOTE:”.
If“YES”proceed to step 8).
If“NO”proceed to step 13).
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4. Diagnostics Chart for On-board Diagnostic System

G5M0430
8) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Connect connector (AB8) to
(AB3). Remove driver side airbag module and connect test
harness C connector (1C) to (AB7).
Connect airbag resistor to test harness C connector (3C).
Connect battery ground cable and turn ignition switch
“ON”. Does airbag warning light go“OFF”after 8 seconds
and remain off for more than 30 seconds?
See“NOTE:”.
If“YES”proceed to step 9).
If“NO”proceed to step 14).
9) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Replace with a new driver side
airbag module. Proceed to step
15).
G5M0429
10) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Remove lower cover panel
and connect test harness C connector (1C) to (AB8) to 5-4 [W1A0].> with airbag resistor attached to test har-
ness C connector (3C).
Connect battery ground cable and turn ignition switch
“ON”. Does airbag warning light go“OFF”after 8 seconds
and remain off for more than 30 seconds?
See“NOTE:”.
If“YES”proceed to step 8).
If“NO”proceed to step 3).
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4. Diagnostics Chart for On-board Diagnostic System

G5M0589
11) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Disconnect passenger side
airbag module connector (AB9) to (AB10). [W3A2].>
Connect test harness C connector (1C) to (AB9). Connect
airbag resistor to test harness C connector (3C).
Connect battery ground cable and turn ignition switch
“ON”. Does airbag warning light go“OFF”after 8 seconds
and remain off for more than 30 seconds?
See“NOTE:”.
If“YES”proceed to step 12).
If“NO”proceed to step 3).
12) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Replace with a new passen-
ger side airbag module then pro-
ceed to step 15).
13) Turn ignition switch“OFF”, disconnect battery ground
cable and wait 20 seconds. Replace with a new passenger
side airbag module then proceed
to step 7).
14) Turn ignition switch“OFF”, disconnect battery ground
cable, and wait 20 seconds. Replace with a new combina-
tion switch, and install driver side
airbag module .
Connect battery ground cable and turn ignition switch
“ON”. Does airbag warning light go“OFF”after 8 seconds
and remain off for more than 30 seconds?
See“NOTE:”.
If“YES”proceed to step 16).
If“NO”proceed to step 9).
15) Connect battery ground cable and turn ignition switch
“ON”. Does airbag warning light go“OFF”after 8 seconds
and remain off for more than 30 seconds? See“NOTE:”.
If“YES”proceed to step 16).
If“NO”proceed to step 1).
16) Perform clear memory procedure. [T4C0].>
If memory cannot be cleared, another trouble code exists.
Return to step 1).
If memory can be cleared, proceed to step 17).
17) END
NOTE:
Always remember to secure the green double locks
before turning the ignition switch“ON”.
In some cases the airbag warning light will go“OFF”
after 8 seconds but will turn“ON”again within 30 seconds.
In this case continue diagnostics with the basic diagnostics
procedures or trouble code procedures.
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4. Diagnostics Chart for On-board Diagnostic System

5. Diagnostics Chart with Trouble Code

A: TROUBLE CODE 04
DIAGNOSIS:
Airbag main harness circuit is shorted.
Airbag module harness (Passenger) circuit is shorted.
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) terminal.
: Connector & terminal
(5B) No. 6 — (5B) No. 7:
Is resistance more than 10 kΩ?
: Replace airbag control module.
: Replace airbag main harness.
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5. Diagnostics Chart with Trouble Code

B: TROUBLE CODE 11
DIAGNOSIS:
Airbag control module is faulty.
Airbag main harness circuit is open.
Fuse No. 8 is blown.
Body harness circuit is open.
1. Airbag control module inspection
2. Airbag main harness inspection
3. Fuse No. 8 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. 2 (+)—Chassis ground ():
Is voltage more than 10 V?
: Replace airbag control module.
: Go to step2.


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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. AIR BAG
CONTROL MODULE INSPECTION”previously outlined.
2) Turn ignition switch“OFF”, disconnect battery ground
terminal and then wait at least 20 seconds.
B5M0119B
3) Disconnect body harness connector (B31) from connec-
tor (AB1) at front lower pillar, and connect connector (AB1)
to test harness A connector (2A).
4) Measure resistance between test harness A connector
(5A) terminal and test harness B2 connector (5B) terminal.
: Connector & terminal
(5A) No. 1—(5B) No. 2:
Is resistance less than 10Ω?
: Go to step 5).
: Replace airbag main harness.
5) Measure resistance between (5A) and (5B) connector
terminals and chassis ground.
: Connector & terminal
(5A) No. 1 (+)—Chassis ground ():
Is resistance more than 10 kΩ?
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 2 (+)—Chassis ground ():
Is resistance more than 10 kΩ?
: Go to step3.
: Replace airbag main harness.
G5M0444
3. FUSE No. 8 INSPECTION
1) Turn ignition switch“OFF”, and remove airbag fuse pro-
tector.
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5. Diagnostics Chart with Trouble Code

G5M0445
2) Remove and visually check fuse No. 8.
: Is fuse No. 8 blown?
: Replace fuse No. 8 if fuse No. 8 blows again,
repair body harness.
: Repair body harness.
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5. Diagnostics Chart with Trouble Code

C: TROUBLE CODE 12
DIAGNOSIS:
Airbag main harness circuit is open.
Airbag module harness (Driver) circuit is open.
Roll connector 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.
G5M0446
1. AIRBAG MAIN HARNESS INSPECTION
1) Remove lower cover panel , and
connect connector (AB8) below steering column 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. 14—(3C) No. 4:
Is resistance less than 10Ω?
: Go to next.
: Replace airbag main harness.
: Connector & terminal
(5B) No. 1—(3C) No. 3:
Is resistance less than 10Ω?
: Replace airbag control module.
: Replace airbag main harness.
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5. Diagnostics Chart with Trouble Code

D: TROUBLE CODE 13
DIAGNOSIS:
Airbag main harness circuit is shorted.
Airbag module harness (Driver) is shorted.
Roll connector circuit is shorted.
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) terminal.
: Connector & terminal
(5B) No. 1—(5B) No. 14:
Is resistance more than 10 kΩ?
: Replace airbag control module.
: Replace airbag main harness.
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5. Diagnostics Chart with Trouble Code