Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 638
AB(diag)-91
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AH:DTC 53 SIDE AIRBAG SENSOR RH FAILURE
DTC DETECTING CONDITION:
Side airbag sensor (RH) is faulty.
When DTC 53 is displayed, the circuit within the side airbag sensor (RH) is faulty.
Replace the side airbag sensor (RH). <Ref. to AB-23, Side Airbag Sensor.>
AI: DTC 54 SIDE AIRBAG SENSOR LH FAILURE
DTC DETECTING CONDITION:
Side airbag sensor (LH) is faulty.
When DTC 54 is displayed, the circuit within the side airbag sensor (LH) is faulty.
Replace the side airbag sensor (LH). <Ref. to AB-23, Side Airbag Sensor.>
AJ:DTC 55 SIDE CURTAIN AIRBAG FIRING OUTPUT
This DTC is displayed when the side airbag module and curtain airbag module are deployed.
Once this DTC is displayed, the memory cannot be cleared. Replace the following parts.
• Airbag control module <Ref. to AB-21, Airbag Control Module.>
• Side airbag module (operating side) <Ref. to AB-17, Side Airbag Module.>
• Side airbag sensor (operating side) <Ref. to AB-23, Side Airbag Sensor.>
• Curtain airbag module (operating side) <Ref. to AB-19, Curtain Airbag Module.>
• Curtain airbag sensor (operating side) <Ref. to AB-24, Curtain Airbag Sensor.>
• Satellite safing sensor <Ref. to AB-25, Satellite Safing Sensor.>
AK:DTC 58 CURTAIN AIRBAG SENSOR RH FAILURE
DTC DETECTING CONDITION:
Curtain airbag sensor (RH) is faulty.
If DTC 58 is displayed, the circuit within the curtain airbag sensor (RH) is faulty.
Replace the curtain airbag sensor (RH). <Ref. to AB-24, Curtain Airbag Sensor.>
AL:DTC 59 CURTAIN AIRBAG SENSOR LH FAILURE
DTC DETECTING CONDITION:
Curtain airbag sensor (LH) is faulty.
If DTC 59 is displayed, the circuit within the curtain airbag sensor (LH) is faulty.
Replace the curtain airbag sensor (LH). <Ref. to AB-24, Curtain Airbag Sensor.>
AB(diag)-92
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AM:DTC 5A SIDE AIRBAG SENSOR RH FALSE INSTALLATION
DTC DETECTING CONDITION:
Side airbag sensor RH is misinstalled.
AN:DTC 5B SIDE AIRBAG SENSOR LH FALSE INSTALLATION
DTC DETECTING CONDITION:
Side airbag sensor LH is misinstalled.
AO:DTC 5C CURTAIN AIRBAG SENSOR RH FALSE INSTALLATION
DTC DETECTING CONDITION:
Curtain airbag sensor RH is misinstalled.
AP:DTC 5D CURTAIN AIRBAG SENSOR LH FALSE INSTALLATION
DTC DETECTING CONDITION:
Curtain airbag sensor LH is misinstalled.
Step
Check
Yes
No
1
REPLACE SIDE AIRBAG SENSOR (RH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Replace the side A/B sensor (RH) with a
genuine sensor. <Ref. to AB-23, REMOVAL,
Side Airbag Sensor.>
Does the warning light go off? Finish the diagno-
sis.
Replace the airbag
control module.
<Ref. to AB-21,
REMOVAL, Airbag
Control Module.>
Step
Check
Yes
No
1
REPLACE SIDE AIRBAG SENSOR (LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Replace the side A/B sensor (LH) with a
genuine sensor. <Ref. to AB-23, REMOVAL,
Side Airbag Sensor.>
Does the warning light go off? Finish the diagno-
sis.
Replace the airbag
control module.
<Ref. to AB-21,
REMOVAL, Airbag
Control Module.>
Step
Check
Yes
No
1
REPLACE 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) Replace the curtain A/B sensor (RH) with a
genuine sensor. <Ref. to AB-24, REMOVAL,
Curtain Airbag Sensor.>
Does the warning light go off? Finish the diagno-
sis.
Replace the airbag
control module.
<Ref. to AB-21,
REMOVAL, Airbag
Control Module.>
Step
Check
Yes
No
1
REPLACE CURTAIN AIRBAG SENSOR (LH).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Replace the curtain A/B sensor (LH) with a
genuine sensor. <Ref. to AB-24, REMOVAL,
Curtain Airbag Sensor.>
Does the warning light go off? Finish the diagno-
sis.
Replace the airbag
control module.
<Ref. to AB-21,
REMOVAL, Airbag
Control Module.>
AB(diag)-93
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
AQ:DTC 61 BELT PRETENSIONER RH FAILURE
DTC DETECTING CONDITION:
• Seat belt pretensioner (RH) circuit is shorted to ground.
• Pretensioner (RH) is faulty.
• Pretensioner harness (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 and the seat
belt pretensioner RH.
Is there poor contact?
Replace the airbag
rear harness along
with body harness.
2
CHECK SEAT BELT PRETENSIONER.
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) Connect the connector (1N) in the test har-
ness N to the connector (AB26).
4) Connect the airbag resistor to the connector
(2N) of test harness N.
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 seat
belt pretensioner
(RH). <Ref. to SB-
18, Front Seat
Belt.>
AB-02460
AB18
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
AB26
1 2
4
5
AB26
2
1
AB18
AIRBAG CM
PRETENSIONER RH
AB(diag)-94
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
3
CHECK AIRBAG REAR HARNESS (PRE-
TENSIONER 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 airbag resistor from the con-
nector (2N) of test harness N.
3) Disconnect connector (AB24) from side air-
bag module (RH).
4) Disconnect the connector (AB33) from cur-
tain airbag module (RH).
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 (AB18, AB17, AB6).
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
(3AG) in the test harness AG and chassis
ground.
Connector & terminal
(3AG) No. 18 — Chassis ground:
(3AG) No. 20 — Chassis ground:
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?
Replace the airbag
control module.
<Ref. to AB-21,
Airbag Control
Module.>
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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