Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 656

AB(diag)-163

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SIDE AIRBAG SENSOR LH).
1) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
2) Connect the connector (1AH) in the test har-
ness AH to the connectors (AB17, AB6, AB18).
3) Connect the connector (2AH) in the test har-
ness AH and the connector (1AG) in the test
harness AG.
4) Disconnect the connector (AB23) in the side
airbag sensor (LH) from the connector (1AI) in
the test harness AI.
5) Disconnect the connector (2AI) in the test
harness AI from the connector (1V) in the test
harness V.
6) Connect the connector (2V) in the test har-
ness V to the connector (AB23).
7) Measure the resistance between connector
(5AG) in the test harness AG and connector
(3V) in the test harness V.

Connector & terminal

(5AG) No. 9 — (3V) No. 2:
(5AG) No. 10 — (3V) No. 1:

Is the resistance less than 10

Ω?

Go to step

Replace the airbag
rear harness along
with body harness.

CHECK AIRBAG REAR HARNESS (BE-
TWEEN SIDE AIRBAG SENSOR LH AND
CURTAIN AIRBAG SENSOR LH).
Measure the resistance between connector
(3V) in test harness V and chassis ground, and
the resistance between connector (5AG) termi-
nals in test harness AG.

Connector & terminal

(5AG) No. 9 — Chassis ground:
(5AG) No. 10 — Chassis ground:
(5AG) No. 9 — (5AG) No. 10:

Is the resistance 1 MΩ or
more?

Go to step

Replace the airbag
rear 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?

Go to step

REPLACE SIDE AIRBAG SENSOR (LH) AND
CHECK AIRBAG CONTROL MODULE AF-
TER REPLACEMENT.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Replace the side airbag sensor (LH). <Ref.
to AB-23, REMOVAL, Side Airbag Sensor.>
3) Connect all connectors.
4) Clear the memory.
5) Perform the Inspection Mode.
6) Read the DTC.

Is the system normal?

Go to step

Replace the cur-
tain airbag sensor
(LH). <Ref. to AB-
24, REMOVAL,
Curtain Airbag
Sensor.> Replace
the airbag control
module if not oper-
ating normally
even after replac-
ing the sensor.
<Ref. to AB-21,
REMOVAL, Airbag
Control Module.>

Step

Check

Yes

AB(diag)-164

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

CD:DTC F7 SATELLITE SENSOR BUS COMMUNICATION ERROR

NOTE:

Refer to DTC FA for details on DTC F7. <Ref. to AB(diag)-165, DTC FA SATELLITE SENSOR BUS COM-

MUNICATION ERROR, Diagnostic Chart with Trouble Code.>

CE:DTC F8 SATELLITE SENSOR BUS COMMUNICATION ERROR

NOTE:

Refer to DTC FA for details on DTC F8. <Ref. to AB(diag)-165, DTC FA SATELLITE SENSOR BUS COM-

MUNICATION ERROR, Diagnostic Chart with Trouble Code.>

CF:DTC F9 SATELLITE SENSOR BUS COMMUNICATION ERROR

NOTE:

Refer to DTC FA for details on DTC F9. <Ref. to AB(diag)-165, DTC FA SATELLITE SENSOR BUS COM-

MUNICATION ERROR, Diagnostic Chart with Trouble Code.>

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)-165

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

CG:DTC FA SATELLITE SENSOR BUS COMMUNICATION ERROR

DTC DETECTING CONDITION:

• Open or short circuit in harness of satellite safing sensor.

• Satellite safing sensor 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 approx. 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 and seat belt

pretensioners of the driver’s and passenger’s seats for safety reasons.

• 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
(AB17, AB41) between the airbag control mod-
ule and the satellite safing sensor.

Is there poor contact?

Replace the airbag
rear harness along
with body harness.

Go to step

AB41

AB17

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

AB17

AB-02469

AIRBAG CM

SATELLITE SAFING

SENSOR

AB(diag)-166

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SATELLITE SAFING SENSOR).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Disconnect the connectors (AB21, AB26)
from seat belt pretensioner.
3) Disconnect the connectors (AB31, AB33)
from curtain airbag module.
4) Disconnect connectors (AB19) and (AB24)
from the side airbag module.
5) Disconnect the connectors (AB17, AB6,
AB18) from airbag control module.
6) Connect the connector (1AH) in the test har-
ness AH to the connectors (AB17, AB6, AB18).
7) Connect the connector (2AH) in the test har-
ness AH and the connector (1AG) in the test
harness AG.
8) Disconnect the connector (AB41) from the
satellite safing sensor and connect to the test
harness H connector (1H).
9) Measure the resistance between connec-
tors (5AG) and (4AG) in the test harness AG
and connector (3H) in the test harness H.

Connector & terminal

(4AG) No. 3 — (3H) No. 5:
(5AG) No. 11 — (3H) No. 6:

Is the resistance less than 10

Ω?

Go to step

Replace the airbag
rear harness along
with body harness.

CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SATELLITE SAFING SENSOR).
Measure the resistance between connector
(5AG) in the test harness AG and chassis
ground, and the resistance between connector
(5AG) terminals in the test harness AG.

Connector & terminal

(4AG) No. 3 — Chassis ground:
(5AG) No. 11 — Chassis ground:
(4AG) No. 3 — (5AG) No. 11:

Is the resistance 1 MΩ or
more?

Go to step

Replace the airbag
rear 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 satel-
lite safing sensor.
<Ref. to AB-25,
REMOVAL, Satel-
lite Safing Sen-
sor.> Replace the
airbag control
module if not oper-
ating normally
even after replac-
ing the sensor.
<Ref. to AB-21,
REMOVAL, 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.