Subaru Legacy IV (2008 year). Service manual — part 1012
AB(diag)-36
Airbag Warning Light Failure
AIRBAG SYSTEM (DIAGNOSTICS)
B: AIRBAG WARNING LIGHT REMAINS OFF
DETECTING CONDITION:
• Fuse No. 5 (in fuse box) is blown out.
• 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 to OFF, disconnect the
ground cable from the battery, and wait 20 seconds or more before starting to work.
• When replacing the airbag module, seat belt pretensioner, roll connector, control module and sen-
sor, reconnect each part and check that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the airbag module connectors of the driver’s
and passenger’s seats for safety.
• When inspecting the airbag rear harness, disconnect the side airbag module connector, curtain
airbag module connector and seat belt pretensioner connector for safety reasons.
WIRING DIAGRAM:
AB6
B31
AB1
No.5
11
A3
AB6
AB1
i10
B36
i1
i1
3
14
1 2
3 4
5 6 7 8 9 10
16
11
15
14
13
12
17
19
18
23
25
24
20
22
21
26
28
27
2
1
3 4
6 7 8 9 10
22
21
20
19
18
17
16
15
14
13
12
11
5
*
*
: WITHOUT MID MODEL : A13
: WITH MID MODEL
: B14
i10
A:
i11
B:
1 2 3
4 5 6
7 8 9 10 11 12 13 14
i11
B:
A:
AB-01760
18 19 20
21 22 23 24 25 26 27 28
1 2 3
5 6 7 8
10
9
4
11 12 13 14
16 17
15
29 30
1 2
3 4
5 6 7 8 9 10
E
E
26
25
IGNITION SWITCH
AIRB
A
G
W
ARNING
LIGHT
REVERSE
CIRCUIT
COMBINATION METER
BATTERY
AIRBAG CONTROL MODULE
AB(diag)-37
Airbag Warning Light Failure
AIRBAG SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK COMBINATION METER.
Turn the ignition switch to ON, and confirm that
warning lights of combination meter illuminate.
Do warning lights except for air-
bag illuminate?
Go to step 2.
Check the combi-
nation meter.
2
CHECK DTC.
Read the DTC. <Ref. to AB(diag)-24, READ
DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
Is DTC displayed?
Perform the diag-
nosis according to
DTC.
Go to step 3.
3
CHECK FUSE NO. 5 (IN MAIN FUSE BOX).
Remove the fuse No. 5 and perform visual
inspection.
Is fuse No. 5 (in the main fuse
box) blown out?
Replace the fuse
No. 5. If the fuse
No. 5 is blown out
again, go to step 4.
Go to step 4.
4
CHECK AIRBAG WARNING LIGHT CIRCUIT
(IN COMBINATION METER).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connectors (AB1) and
(B31).
3) Connect the battery ground terminal and
turn the ignition switch to ON.
Does airbag warning light illu-
minate?
Go to step 5.
Check the combi-
nation meter.
5
CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Connect the connector (AB1) and (B31).
3) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
4) Connect the battery ground terminal and
turn the ignition switch to ON.
Does airbag warning light illu-
minate?
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Replace the airbag
main harness
along with bulk-
head harness.
AB(diag)-38
List of Diagnostic Trouble Code (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
13.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC
Display
Content of diagnosis
Reference
11
Driver’s Airbag failure
• Airbag main harness circuit is open, shorted or
shorted to ground.
• Airbag module harness (Driver’s side) 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(diag)-46,
DTC 11 DRIVER’S AIR-
BAG FAILURE, Diag-
nostic Chart with Trouble
Code.>
12
Passenger’s Airbag failure
• Airbag main harness circuit is open, shorted or
shorted to ground.
• Airbag module harness (Passenger’s side) circuit is
open, shorted or shorted to ground.
• Airbag control module is faulty.
• Passenger’s airbag module is faulty.
<Ref. to AB(diag)-49,
DTC 12 PASSENGER’S
AIRBAG FAILURE,
Diagnostic Chart with
Trouble Code.>
15
Driver’s Airbag failure
• Airbag main harness circuit (Driver’s side) is
shorted to power supply.
• Airbag module harness circuit (Driver’s side) 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(diag)-51,
DTC 15 DRIVER’S AIR-
BAG FAILURE, Diag-
nostic Chart with Trouble
Code.>
16
Passenger’s Airbag failure
• Airbag main harness circuit (Passenger’s side) is
shorted to power supply.
• Airbag module harness circuit (Passenger’s side) is
shorted to power supply.
• Airbag control module is faulty.
• Passenger’s airbag module is faulty.
<Ref. to AB(diag)-54,
DTC 16 PASSENGER’S
AIRBAG FAILURE,
Diagnostic Chart with
Trouble Code.>
21
Airbag ECU failure
Airbag control module is faulty.
<Ref. to AB(diag)-56,
DTC 21 AIRBAG ECM
FAILURE, Diagnostic
Chart with Trouble
Code.>
22
Front Airbag: Firing output
Front airbag module and seat belt pretensioner (LH/
RH) are inflated.
<Ref. to AB(diag)-57,
DTC 22 FRONT AIR-
BAG FIRING OUTPUT,
Diagnostic Chart with
Trouble Code.>
26
Passenger's Airbag indicator failure
• Passenger’s airbag indicator is faulty.
• Airbag control module is faulty.
• Airbag main harness circuit is open, shorted or
shorted to ground.
• Body harness circuit is open.
<Ref. to AB(diag)-58,
DTC 26 PASSENGER’S
AIRBAG INDICATOR
FAILURE, Diagnostic
Chart with Trouble
Code.>
27
ODS Communication error
• Occupant detection control module communication
is faulty.
• Airbag rear harness circuit is open, shorted,
shorted to ground or shorted to power supply.
• Occupant detection harness is faulty.
• Airbag control module is faulty.
• Occupant detection system is faulty.
<Ref. to AB(diag)-60,
DTC 27 ODS COMMU-
NICATION ERROR,
Diagnostic Chart with
Trouble Code.>
AB(diag)-39
List of Diagnostic Trouble Code (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
29
ODS failure
• Occupant detection sensor is faulty.
• Occupant detection control module is faulty.
• Occupant detection harness is faulty.
• Fuse No. 25 (in joint box) is blown.
Refer to “Occupant
Detection System” for
details on DTC 29. <Ref.
to OD(diag)-26, DTC 29
ODS FAILURE, Diag-
nostic Procedure with
Diagnostic Trouble Code
(DTC).>
2A
ODS Calibration error
System calibration (Rezeroing) of the occupant detec-
tion system was not ended normally.
Refer to “Occupant
Detection System” for
details on DTC 2A. <Ref.
to OD(diag)-23, DTC 2A
ODS CALIBRATION
ERROR, Diagnostic Pro-
cedure with Diagnostic
Trouble Code (DTC).>
2B
ODS System wrong parts
• Wrong airbag control module was installed.
• Wrong occupant detection system was installed.
• Occupant detection system is faulty.
Refer to “Occupant
Detection System” for
details on DTC 2B. <Ref.
to OD(diag)-23, DTC 2B
ODS SYSTEM WRONG
PARTS, Diagnostic Pro-
cedure with Diagnostic
Trouble Code (DTC).>
2C
Belt tension Sensor failure
• Passenger’s seat belt tension sensor is faulty.
• Occupant detection system is faulty.
• Airbag rear harness circuit is open, shorted,
shorted to ground or shorted to power supply.
• Occupant detection harness is faulty.
Refer to “Occupant
Detection System” for
details on DTC 2C. <Ref.
to OD(diag)-24, DTC 2C
BELT TENSION SEN-
SOR FAILURE, Diag-
nostic Procedure with
Diagnostic Trouble Code
(DTC).>
33
FrontSubSensor RH failure
Front sub sensor (RH) is faulty.
<Ref. to AB(diag)-61,
DTC 33 FRONT SUB
SENSOR RH FAILURE,
Diagnostic Chart with
Trouble Code.>
34
FrontSubSensor LH failure
Front sub sensor (LH) is faulty.
<Ref. to AB(diag)-61,
DTC 34 FRONT SUB
SENSOR LH FAILURE,
Diagnostic Chart with
Trouble Code.>
37
Buckle Switch RH failure
• Passenger’s buckle switch circuit is open, shorted
or shorted to ground.
• Occupant detection system is faulty.
• Occupant detection harness is faulty.
Refer to “Occupant
Detection System” for
details on DTC 37. <Ref.
to OD(diag)-27, DTC 37
BUCKLE SWITCH RH
FAILURE, Diagnostic
Procedure with Diagnos-
tic Trouble Code (DTC).>
39
Seatbelt Warning failure
• Airbag control module is faulty.
• Body integrated unit is faulty.
• Harness circuits between body integrated unit and
airbag control module are open, shorted or shorted to
ground.
<Ref. to AB(diag)-62,
DTC 39 SEAT BELT
WARNING FAILURE,
Diagnostic Chart with
Trouble Code.>
DTC
Display
Content of diagnosis
Reference
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