Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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

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.

Go to step

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.>

Go to step

1 2 3 4

18 19 20

21 22 23 24 25 26 27 28

1 2 3

5 6 7 8

11 12 13 14

16 17

29 30

AB9

AB6

AB9

AB6

AB-02488

AIRBAG CM

PASSENGER'S AIRBAG MODULE

AB(diag)-128

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

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?

Go to step

Replace the airbag
main harness
along with body
harness.

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.>

Go to step

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)-39, List
of Diagnostic Trou-
ble Code (DTC).>

Finish the diagno-
sis.

Step

Check

Yes

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

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.

Go to step

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.>

Go to step

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

AB34

AB33

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)

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.