Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 647
AB(diag)-127
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
BF:DTC 7E PASSENGER’S AIRBAG FAILURE
DTC DETECTING CONDITION:
• Airbag main harness circuit is open.
• Airbag module harness (passenger’s side) circuit is open.
• 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 battery, and wait 60 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 system <Ref. to WI-82, WIRING DIAGRAM, Airbag System.>
Step
Check
Yes
No
1
CHECK POOR CONTACT OF CONNEC-
TORS.
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
harness.
2
CHECK PASSENGER’S AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Remove the console front panel and discon-
nect the connector (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 six seconds and
go off?
Replace the pas-
senger’s airbag
module. <Ref. to
AB-16, Passen-
ger’s Airbag Mod-
ule.>
1 2 3 4
4
3
2
1
4
3
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
AB9
AB6
AB9
AB6
1
2
AB-02488
AIRBAG CM
PASSENGER'S AIRBAG MODULE
AB(diag)-128
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 60 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 column cover, and disconnect the connec-
tor (AB7) from (AB2).
4) Disconnect the connectors (AB6, AB17,
AB18) from the airbag control module, and con-
nect the connector (1AH) in the test harness
AH.
5) Connect the connector (2AH) in the test har-
ness AH and the connector (1AG) in the test
harness AG.
6) Measure the resistance between connector
(3AG) of test harness AG and connector (3P) of
test harness P.
Connector & terminal
(3AG) No. 6 — (3P) No. 4:
(3AG) No. 8 — (3P) No. 3:
Is the resistance less than 10
Ω?
Replace the airbag
main harness
along with body
harness.
4
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-21,
Airbag Control
Module.>
5
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Finish the diagno-
sis.
Step
Check
Yes
No
AB(diag)-129
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
BG:DTC 91 CURTAIN AIRBAG MODULE RH FAILURE
DTC DETECTING CONDITION:
• Curtain airbag harness (RH) circuit is shorted to ground.
• Curtain airbag module (RH) 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 battery, and wait 60 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:
Airbag system <Ref. to WI-82, WIRING DIAGRAM, Airbag System.>
Step
Check
Yes
No
1
CHECK POOR CONTACT OF CONNEC-
TORS.
Check for poor contact of the connectors
between the airbag control module, curtain air-
bag module RH and the curtain airbag sensor
RH.
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
2
CHECK CURTAIN AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Disconnect the connector (AB33), and con-
nect the connector (1N) in test harness N to
connector (AB33).
3) Connect the airbag resistor to the connector
(2N) of test harness N.
4) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the airbag warning light
illuminate for six seconds and
go off?
Replace the cur-
tain airbag module
(RH). <Ref. to AB-
19, Curtain Airbag
Module.>
AB-02463
AB18
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
AB33
1 2
AB28 AB34
1 2 3 4
AB18
10
9
8
11
AB34
4
3
AB33
2
1
4
3
2
1
AB28
AIRBAG CM
CURTAIN AIRBAG
SENSOR RH
CURTAIN AIRBAG
MODULE RH
SIDE AIRBAG
SENSOR RH
AB(diag)-130
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
3
CHECK AIRBAG REAR HARNESS (CUR-
TAIN AIRBAG MODULE HARNESS RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Disconnect the connector (AB26) from seat
belt pretensioner (RH).
3) Disconnect connector (AB24) from side air-
bag module (RH).
4) Disconnect the airbag resistor from test har-
ness N.
5) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
6) Connect the connector (1AH) in the test har-
ness AH to the connectors (AB6, AB17, AB18).
7) Connect the connector (2AH) in the test har-
ness AH and the connector (1AG) in the test
harness AG.
8) Measure the resistance between connector
(5AG) in the test harness AG and chassis
ground.
Connector & terminal
(5AG) No. 6 — Chassis ground:
(5AG) No. 12 — Chassis ground:
Is the resistance 1 MΩ or
more?
Replace the airbag
rear harness along
with body harness.
4
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-21,
Airbag Control
Module.>
5
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Finish the diagno-
sis.
Step
Check
Yes
No
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