Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 654
AB(diag)-155
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
2
CHECK AIRBAG REAR HARNESS (BE-
TWEEN SIDE AIRBAG SENSOR (RH) AND
CURTAIN AIRBAG SENSOR (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 connector (AB24) of the side
airbag module (RH).
5) Disconnect connector (AB28) from side air-
bag sensor (RH).
6) Connect the connector (AB28) of side air-
bag sensor (RH) and the connector (1AI) in the
test harness AI.
7) Connect the connector (2AI) in the test har-
ness AI and the connector (1V) in the test har-
ness V.
8) Disconnect the connector (AB34) from cur-
tain airbag sensor (RH), and connect the con-
nector (2V) in test harness V to connector
(AB34).
9) Measure the resistance between connector
(3V) terminals in the test harness V.
Connector & terminal
(3V) No. 2 — (3V) No. 6:
(3V) No. 1 — (3V) No. 7:
Is the resistance less than 10
Ω?
Replace the airbag
rear harness along
with body harness.
3
CHECK AIRBAG REAR HARNESS (BE-
TWEEN SIDE AIRBAG SENSOR AND CUR-
TAIN AIRBAG SENSOR RH).
Measure the resistance between connector
(3V) in test harness V and chassis ground, and
the resistance between connector (3V) in test
harness V.
Connector & terminal
(3V) No. 2 — Chassis ground:
(3V) No. 1 — Chassis ground:
(3V) No. 2 — (3V) No. 1:
Is the resistance 1 MΩ or
more?
Replace the airbag
rear harness along
with body harness.
Step
Check
Yes
No
AB(diag)-156
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
4
CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SIDE AIRBAG SENSOR (RH)).
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 (AB28) in the side
airbag sensor (RH) 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 (AB28) of side air-
bag sensor (RH) and the connector (2V) in the
test harness V.
7) Measure the resistance between connector
(5AG) in the test harness AG and connector
(3V) in the test harness V.
Connector & terminal
(5AG) No. 14 — (3V) No. 1:
(5AG) No. 15 — (3V) No. 2:
Is the resistance less than 10
Ω?
Replace the airbag
rear harness along
with body harness.
5
CHECK AIRBAG REAR HARNESS (BE-
TWEEN AIRBAG CONTROL MODULE AND
SIDE AIRBAG SENSOR RH).
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
(5AG) No. 14 — Chassis ground:
(5AG) No. 15 — Chassis ground:
(5AG) No. 14 — (5AG) No. 15:
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 (RH) 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 (RH). <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)-157
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
BY:DTC F1 SIDE SENSOR BUS LH COMMUNICATION ERROR
NOTE:
Refer to DTC F4 for details on DTC F1. <Ref. to AB(diag)-158, DTC F4 SIDE SENSOR BUS LH COMMU-
NICATION ERROR, Diagnostic Chart with Trouble Code.>
BZ:DTC F3 SIDE SENSOR BUS LH COMMUNICATION ERROR
NOTE:
Refer to DTC F4 for details on DTC F3. <Ref. to AB(diag)-158, DTC F4 SIDE SENSOR BUS LH COMMU-
NICATION 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)-158
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
CA:DTC F4 SIDE SENSOR BUS LH COMMUNICATION ERROR
DTC DETECTING CONDITION:
• Open or short circuit in harness of side sensor bus (LH).
• Side airbag sensor (LH) and curtain airbag sensor (LH) are 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, AB23, AB32) between the airbag control
module and the curtain airbag sensor (LH).
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
1 2
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
1 2 3 4
1 2 3 4
AB17
AB31
0
1
AB31
1
2
9
7
6
5
1
8
AB17
AB32
AB23
AB19
AB32
4
3
AB19
3
2
4
3
2
1
AB23
AB-02468
AIRBAG CM
CURTAIN AIRBAG
SENSOR LH
SIDE AIRBAG
SENSOR LH
SIDE AIRBAG
MODULE LH
CURTAIN AIRBAG
MODULE LH
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