Subaru Legacy IV (2008 year). Service manual — part 1024
AB(diag)-84
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AE:DTC 72 PASSENGER’S AIRBAG FAILURE
DTC DETECTING CONDITION:
• 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.
• Passenger’s airbag module 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.
NOTE:
Prior to starting work, prepare two airbag resistors (98299PA040).
WIRING DIAGRAM:
Step
Check
Yes
No
1
CHECK POOR CONTACT IN CONNECTORS.
Check for poor contact of the connectors
between the airbag control module and the pas-
senger’s airbag module.
Is there poor contact?
Replace the airbag
main harness
along with body
harness.
Go to step 2.
2
CHECK PASSENGER’S AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Remove the instrument panel side cover on
the passenger’s side and disconnect the con-
nector (AB10) from (AB9).
3) Connect the connector (1P) in the test har-
ness P to connector (AB9).
4) Connect the airbag resistor to the connec-
tors (2P) and (3P) of test harness P.
5) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the airbag warning light
illuminate for 6 seconds and go
off?
Replace the pas-
senger’s airbag
module. <Ref. to
AB-15, Passen-
ger’s Airbag Mod-
ule.>
Go to step 3.
AB6
AB9
AB10
3
4
3
4
2
1
1
2
AB6
AB9
1 2 3 4
AB-01762
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
AIRBAG CONTROL MODULE
PASSENGER'S
AIRBAG MODULE
AB(diag)-85
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
3
CHECK AIRBAG MAIN HARNESS (PASSEN-
GER’S AIRBAG HARNESS).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the airbag resistor from the con-
nectors (2P) and (3P) of test harness P.
3) Remove the instrument panel lower cover
and disconnect the connector (AB7) from
(AB2).
4) Disconnect the connectors (AB6, AB17,
AB18) from the airbag control module, and con-
nect the test harness AG connector (1AG).
5) Measure the resistance between connector
(3AG) in the test harness AG and connectors
(2P) and (3P) in the test harness P.
Connector & terminal
(3AG) No. 8 — (3P) No. 3:
(3AG) No. 6 — (3P) No. 4:
Is the resistance less than 10
:? Go to step 4.
Replace the airbag
main harness
along with body
harness.
4
CHECK AIRBAG MAIN HARNESS (PASSEN-
GER’S AIRBAG HARNESS).
Measure the resistance between connectors
(3AG) in the test harness AG, and between con-
nector (3AG) and chassis ground.
Connector & terminal
(3AG) No. 6 — (3AG) No. 7:
(3AG) No. 6 — (3AG) No. 9:
(3AG) No. 7 — (3AG) No. 8:
(3AG) No. 8 — (3AG) No. 9:
(3AG) No. 9 — (3AG) No. 7:
(3AG) No. 9 — Chassis ground:
(3AG) No. 7 — Chassis ground:
(3AG) No. 8 — (3AG) No. 6:
(3AG) No. 8 — Chassis ground:
(3AG) No. 6 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 5.
Replace the airbag
main harness
along with body
harness.
5
CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Clear the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
Is the same DTC displayed?
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Go to step 6.
6
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
AB(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
Finish the diagno-
sis.
Step
Check
Yes
No
AB(diag)-86
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AF:DTC 75 DRIVER’S AIRBAG FAILURE
DTC DETECTING CONDITION:
• 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.
• Driver’s airbag module 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.
NOTE:
Prior to starting work, prepare two airbag resistors (98299PA040).
WIRING DIAGRAM:
AIRBAG CONTROL MODULE
7
8
5
6
AB6
AB2
AB2
AB7
AB6
AB38
2
1
2
1
2
1
AB38
AB37
1 2 3 4
2
1
AB37
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
AB-01761
4
3
2
1
STEERING
ROLL CONNECTOR
DRIVER'S
AIRBAG MODULE
AB(diag)-87
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POOR CONTACT IN CONNECTORS.
Check for poor contact of the connectors
between the airbag control module and the
driver’s airbag module.
Is there poor contact?
Replace the airbag
main harness
along with body
harness.
Go to step 2.
2
CHECK DRIVER’S AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Remove the driver’s airbag module.
3) Connect the connector (AB38) to the con-
nector (1N) in the test harness N.
4) Connect the airbag resistor to the connector
(2N) of test harness N.
5) Connect the connector (1Q) in the test har-
ness Q to connector (AB37).
6) Connect the airbag resistor to the connector
(2Q) in the test harness Q.
7) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the airbag warning light
illuminate for 6 seconds and go
off?
Replace the
driver’s airbag
module. <Ref. to
AB-14, Driver’s Air-
bag Module.>
Go to step 3.
3
CHECK ROLL CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the test harness N from connec-
tor (AB38).
3) Disconnect the test harness Q from connec-
tor (AB37).
4) Remove the instrument panel lower cover
and disconnect the connector (AB7) from
(AB2).
5) Connect the connector (1P) in the test har-
ness P to connector (AB2).
6) Connect the airbag resistor to the connec-
tors (2P) and (3P) of test harness P.
7) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the airbag warning light
illuminate for 6 seconds and go
off?
Replace the roll
connector. <Ref. to
AB-25, Roll Con-
nector.>
Go to step 4.
4
CHECK AIRBAG MAIN HARNESS (DRIV-
ER’S AIRBAG HARNESS).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the airbag resistor from the con-
nectors (2P) and (3P) of test harness P.
3) Remove the instrument panel side cover on
the passenger’s side and disconnect the con-
nectors (AB10) and (AB9).
4) Disconnect the connectors (AB6, AB17,
AB18) from the airbag control module, and con-
nect the test harness AG connector (1AG).
5) Connect the battery ground terminal and
turn the ignition switch to ON. (engine OFF)
6) Measure the voltage between connector
(3AG) in the test harness AG and chassis
ground.
Connector & terminal
(3AG) No. 2 (+) — Chassis ground (–):
(3AG) No. 4 (+) — Chassis ground (–):
Is the voltage less than 1 V?
Go to step 5.
Replace the airbag
main harness
along with body
harness.
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