Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 656
AB(diag)-163
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
4
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?
Replace the airbag
rear harness along
with body harness.
5
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?
Replace the airbag
rear harness along
with body harness.
6
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?
7
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?
Step
Check
Yes
No
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.>
8
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Finish the diagno-
sis.
Step
Check
Yes
No
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
No
1
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.
AB41
2
1
AB41
2
1
AB17
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
1
1
12
AB17
AB-02469
AIRBAG CM
SATELLITE SAFING
SENSOR
AB(diag)-166
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
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?
Replace the airbag
rear harness along
with body harness.
3
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?
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?
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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