Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 636

AB(diag)-83

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

AD:DTC 4A SIDE AIRBAG RH FAILURE

DTC DETECTING CONDITION:

• Side airbag harness (RH) circuit is shorted.

• Side 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, side airbag
module RH and the side airbag sensor RH.

Is there poor contact?

Replace the airbag
rear harness along
with body harness.

Go to step

2.

2

CHECK SIDE 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 (AB24) from the
side airbag module (RH), and connect the con-
nector (1AJ) in the test harness AJ to connector
(AB24).
3) Connect the airbag resistor to the test har-
ness AJ connector (3AJ).
4) 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 side
airbag module
(RH). <Ref. to AB-
17, REMOVAL,
Side Airbag Mod-
ule.>

Go to step

3.

AB-02458

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

AB18

1 2 3 4

AB24

1 2 3 4

AB28 AB34

AB18

6

7

8

11

AB34

4

3

AB24

3

2

4

3

2

1

AB28

AIRBAG CM

CURTAIN AIRBAG

SENSOR RH

SIDE AIRBAG

MODULE RH

SIDE AIRBAG

SENSOR RH

AB(diag)-84

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

3

CHECK AIRBAG REAR HARNESS (SIDE
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 the connector (AB33) from cur-
tain airbag module (RH).
4) Disconnect the airbag resistor from test har-
ness AJ.
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
(4AG) terminals in test harness AG.

Connector & terminal

(4AG) No. 11 — (4AG) No. 13:

Is the resistance 1 MΩ or
more?

Go to step

4.

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.>

Go to step

5.

5

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

No

AB(diag)-85

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

AE:DTC 4B SIDE AIRBAG LH FAILURE

DTC DETECTING CONDITION:

• Side airbag harness (LH) circuit is shorted.

• Side airbag module (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 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, side airbag
module LH and the side airbag sensor LH.

Is there poor contact?

Replace the airbag
rear harness along
with body harness.

Go to step

2.

2

CHECK SIDE 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 (AB19) from the
side airbag module (LH), and connect the con-
nector (1AJ) in test harness AJ to the connector
(AB19).
3) Connect the airbag resistor to the test har-
ness AJ connector (3AJ).
4) 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 side
airbag module
(LH). <Ref. to AB-
17, REMOVAL,
Side Airbag Mod-
ule.>

Go to step

3.

AB-02459

AB17

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

AB19

1 2 3 4

AB23 AB32

1 2 3 4

10

9

15

AB19

AB32

AB23

8

AB17

4

3

3

2

4

3

2

1

AIRBAG CM

CURTAIN AIRBAG

SENSOR LH

SIDE AIRBAG

MODULE LH

SIDE AIRBAG

SENSOR LH

AB(diag)-86

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

3

CHECK AIRBAG REAR HARNESS (SIDE
AIRBAG MODULE 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 connector (AB21) from seat
belt pretensioner (LH).
3) Disconnect the connector (AB31) from cur-
tain airbag module (LH).
4) Disconnect the airbag resistor from test har-
ness AJ.
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
(4AG) terminals in test harness AG.

Connector & terminal

(4AG) No. 8 — (4AG) No. 10:

Is the resistance 1 MΩ or
more?

Go to step

4.

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.>

Go to step

5.

5

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

No