Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 642
AB(diag)-107
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AX:DTC 6E BELT PRETENSIONER LH FAILURE
DTC DETECTING CONDITION:
• Seat belt pretensioner (LH) circuit is open.
• Pretensioner (LH) is faulty.
• Pretensioner harness (LH) 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 airbag 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 and the seat
belt pretensioner LH.
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
2
CHECK SEAT BELT PRETENSIONER.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Disconnect the connector (AB21) from seat
belt pretensioner (LH).
3) Connect the connector (1N) in the test har-
ness N to the connector (AB21).
4) Connect the airbag resistor to the connector
(2N) of test harness N.
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 seat
belt pretensioner
(LH). <Ref. to SB-
18, Front Seat
Belt.>
AB-02461
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
1 2
AB17
AB21
AB21
2
1
2
1
AB17
AIRBAG CM
PRETENSIONER LH
AB(diag)-108
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
3
CHECK AIRBAG REAR HARNESS (PRE-
TENSIONER HARNESS LH).
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-
nector (2N) of test harness N.
3) Disconnect connector (AB19) from side air-
bag module (LH).
4) Disconnect the connector (AB31) from cur-
tain airbag module (LH).
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
(3AG) in the test harness AG and connector
(2N) in the test harness N.
Connector & terminal
(3AG) No. 10 — (2N) No. 2:
(3AG) No. 12 — (2N) No. 1:
Is the resistance less than 10
Ω?
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
AB(diag)-109
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AY:DTC 71 DRIVER’S AIRBAG FAILURE
DTC DETECTING CONDITION:
• Airbag main harness circuit is shorted to ground.
• Airbag module harness (driver’s side) circuit is shorted to ground.
• Roll connector circuit is shorted to ground.
• 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 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
driver’s airbag module.
Is there poor contact?
Replace the airbag
main harness
along with body
harness.
AB6
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
2
1
AB38
2
1
AB37
AB2
1 2 3 4
1
2
3
4
AB7
AB2
6
5
8
7
AB38
2
1
2
1
AB37
AB6
AB-02487
AIRBAG CM
ROLL
CONNECTOR
DRIVER'S AIRBAG MODULE
AB(diag)-110
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
CHECK DRIVER’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 driver’s airbag module.
3) Connect the connector (1N) in the test har-
ness N to the connector (AB38).
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 six seconds and
go off?
Replace the
driver’s airbag
module. <Ref. to
AB-15, Driver’s Air-
bag Module.>
3
CHECK ROLL CONNECTOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 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 six seconds and
go off?
Replace the roll
connector. <Ref. to
AB-26, Roll Con-
nector.>
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 60 sec-
onds or more.
2) Disconnect the airbag resistor from the con-
nectors (2P) and (3P) of test harness P.
3) Remove the console front panel and discon-
nect the connector (AB9).
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) in the test harness AG and chassis
ground.
Connector & terminal
(3AG) No. 2 — Chassis ground:
(3AG) No. 4 — Chassis ground:
Is the resistance 1 MΩ or
more?
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-21,
Airbag Control
Module.>
Step
Check
Yes
No
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