Subaru Legacy III (2000-2003 year). Service manual — part 900
AB-26
AIRBAG SYSTEM (DIAGNOSTICS)
AIRBAG WARNING LIGHT FAILURE
B: AIRBAG WARNING LIGHT REMAINS OFF.
DIAGNOSIS:
• Fuse No. 5 (in fuse box) is blown.
• Body harness circuit is open.
• Airbag warning light is faulty.
• Airbag main harness is faulty.
• Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module, and sensor, reconnect each
part and confirm that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the airbag module connector of the driver
and passenger seats for safety reasons.
WIRING DIAGRAM:
IGNITION RELAY
AB-00356
3
B
A
TTER
Y
AIRBAG
INDICATOR
LIGHT
AIRBAG
CIRCUIT
i10
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
AB6
1 2 3
4 5 6
7 8 9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26 27 28
AIRBAG CONTROL MODULE
AB6
B31
AB1
1
C3
i1
B36
I1
A:
B:
i10
i11
C:
i12
B31
1 2
3 4 5
6 7 8 9 10 11 12
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
B36
B4 B5 B6
A4 A5 A6
C5 C6
F6
D4 D5 D6
F1
H1
C4
G6
G1
C2
K1
M1 M2
K6
L1
D1 D2
A1 A2
B1 B2
I6
J6
L2
I1
J1
H6
M4 M5 M6
L4 L5 L6
N5 N6
O4 O5 O6
N4
P4 P5
N2
O1 O2
P1 P2
N3
O3
P3
P6
A3
B3
C3
E4 E5 E6
E1 E2
*
*
: 4-CYLINDER
: 6-CYLINDER LHD
: 6-CYLINDER RHD : C11
: B8
: A5
i11
1 2 3 4
5 6 7
8 9 10 11 12 13 14 15 16
AB-27
AIRBAG SYSTEM (DIAGNOSTICS)
AIRBAG WARNING LIGHT FAILURE
Step
Value
Yes
No
1
CHECK COMBINATION METER.
Turn the ignition switch ON, and confirm that
warning lights equipped in the combination
meter are turned on.
Do warning lights not for the airbag turn on?
Warning lights not for the air-
bag turn ON.
Repair combina-
tion meter power
supply. <Ref. to
IDI-4, Combina-
tion Meter Sys-
tem.>
2
CHECK FUSE NO. 5 (IN MAIN FUSE BOX).
Remove fuse No. 5 and perform visual inspec-
tion.
Is fuse No. 5 (in main fuse box) blown?
Fuse No. 5 is not blown.
Replace fuse No.
5. If fuse No. 5
blows again, go to
step 3.
3
CHECK AIRBAG WARNING LIGHT CIRCUIT
(IN COMBINATION METER).
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect the connector (AB1) from
(B31).
3) Connect the battery ground cable and turn
the ignition switch ON.
Is the airbag warning light turned on?
Airbag warning light turns ON. Go to step 4.
Replace airbag
warning light bulb
or combination
meter printed cir-
cuit. <Ref. to IDI-
14, Combination
Meter Assembly.>
Or repair the body
harness.
4
CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Connect the connector (AB1) to (B31).
3) Disconnect the connector (AB6) from the
airbag control module. <Ref. to AB-17, Air-
bag Control Module.>
4) Connect the battery ground cable and turn
the ignition switch ON.
Is the airbag warning light turned on?
Airbag warning light turns ON. Replace the airbag
control module.
<Ref. to AB-17,
Airbag Control
Module.>
Replace airbag
main harness.
<Ref. to AB-17,
Airbag Control
Module.>
AB-28
AIRBAG SYSTEM (DIAGNOSTICS)
LIST OF DIAGNOSTIC TROUBLE CODE (DTC)
11.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC
Memory
function
Contents of diagnosis
Index No.
11
Provided.
• Airbag main harness circuit is open, shorted or shorted to
ground.
• Airbag module harness (driver) circuit is open, shorted or
shorted to ground.
• Roll connector circuit is open, shorted or shorted to ground.
• Airbag control module is faulty.
• Driver's airbag module is faulty.
<Ref. to AB-30, DTC 11, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
12
Provided.
• Airbag main harness circuit is open, shorted or shorted to
ground.
• Airbag module harness (passenger) circuit is open, shorted
or shorted to ground.
• Airbag control module is faulty.
• Passenger's airbag module is faulty.
<Ref. to AB-34, DTC 12, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
15
Provided.
• Airbag main harness circuit (driver) is shorted to power sup-
ply.
• Airbag module harness (driver) is shorted to power supply.
• Roll connector is shorted to power supply.
• Airbag control module is faulty.
• Driver's airbag module is faulty.
<Ref. to AB-36, DTC 15, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
16
Provided.
• Airbag main harness circuit (passenger) is shorted to power
supply.
• Airbag module harness (passenger) is shorted to power sup-
ply.
• Airbag control module is faulty.
• Passenger's airbag module is faulty.
<Ref. to AB-38, DTC 16, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
21
Provided.
Airbag control module is faulty.
<Ref. to AB-40, DTC 21, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
22
Provided.
Front airbag module and seat belt pretensioner (LH/RH) are
inflated.
<Ref. to AB-41, DTC 22, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
23
Not pro-
vided.
(AB6), (AB17) and (AB18) are not connected properly to airbag
control module.
<Ref. to AB-42, DTC 23, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
24
Not pro-
vided.
• Airbag control module is faulty.
• Airbag main harness circuit is open.
• Fuse No. 11 (in joint box) is blown.
• Body harness circuit is open.
<Ref. to AB-44, DTC 24, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
25
Provided.
• Airbag control module is faulty.
• Airbag main harness circuit is open.
• Fuse No. 6 (in joint box) is blown.
• Body harness circuit is open.
<Ref. to AB-46, DTC 25, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
31
Provided.
• Front sub-sensor harness (RH) circuit is shorted.
• Front sub-sensor harness (RH) circuit is open.
• Front sub-sensor (RH) is faulty.
• Airbag control module is faulty.
<Ref. to AB-48, DTC 31, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
32
Provided.
• Front sub-sensor harness (LH) circuit is shorted.
• Front sub-sensor harness (LH) circuit is open.
• Front sub-sensor (LH) is faulty.
• Airbag control module is faulty.
<Ref. to AB-52, DTC 32, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
41
Provided.
• Side airbag harness (RH) is faulty.
• Side airbag module (RH) is faulty.
• Airbag control module is faulty.
<Ref. to AB-56, DTC 41, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
AB-29
AIRBAG SYSTEM (DIAGNOSTICS)
LIST OF DIAGNOSTIC TROUBLE CODE (DTC)
42
Provided.
• Side airbag harness (LH) is faulty.
• Side airbag module (LH) is faulty.
• Airbag control module is faulty.
<Ref. to AB-58, DTC 42, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
45
Provided.
• Side airbag harness (RH) is shorted to power supply.
• Airbag control module is faulty.
<Ref. to AB-60, DTC 45, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
46
Provided.
• Side airbag harness (LH) is shorted to power supply.
• Airbag control module is faulty.
<Ref. to AB-62, DTC 46, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
51
Provided.
• Side airbag sensor (RH) is faulty.
• Side airbag harness (RH) is faulty.
• Airbag control module is faulty.
<Ref. to AB-64, DTC 51, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
52
Provided.
• Side airbag sensor (LH) is faulty.
• Side airbag harness (LH) is faulty.
• Airbag control module is faulty.
<Ref. to AB-66, DTC 52, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
53
Provided.
Side airbag sensor (RH) is faulty.
<Ref. to AB-68, DTC 53, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
54
Provided.
Side airbag sensor (LH) is faulty.
<Ref. to AB-68, DTC 54, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
55
Provided.
Side airbag module is inflated.
<Ref. to AB-68, DTC 55, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
61
Provided.
• Seat belt pretensioner (RH) circuit is open, shorted or
shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness is faulty.
<Ref. to AB-70, DTC 61, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
62
Provided.
• Seat belt pretensioner (LH) circuit is open, shorted or
shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness is faulty.
<Ref. to AB-72, DTC 62, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
65
Provided.
• Seat belt pretensioner (RH) circuit is shorted to power sup-
ply.
• Pretensioner is faulty.
• Pretensioner harness is faulty.
• Airbag control module is faulty.
<Ref. to AB-74, DTC 65, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
66
Provided.
• Seat belt pretensioner (LH) circuit is shorted to power sup-
ply.
• Pretensioner is faulty.
• Pretensioner harness is faulty.
• Airbag control module is faulty.
<Ref. to AB-76, DTC 66, Diagnostic
Chart with Diagnostic Trouble Code
(DTC).>
DTC
Memory
function
Contents of diagnosis
Index No.
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