Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 631

AB(diag)-63

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

6

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)-64

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

H: DTC 1E PASSENGER’S AIRBAG FAILURE

DTC DETECTING CONDITION:

• Airbag main harness circuit is open.

• Airbag module harness (passenger’s side) circuit is open.

• Passenger’s airbag module 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.
NOTE:

Prior to starting work, prepare two AIRBAG RESISTORs (98299PA040).

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 pas-
senger’s airbag module.

Is there poor contact?

Replace the airbag
harness.

Go to step

2.

2

CHECK PASSENGER’S AIRBAG MODULE.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Remove the console front panel and discon-
nect the connector (AB9).
3) Connect the connector (1P) in the test har-
ness P to connector (AB9).
4) Connect the airbag resistor to the connec-
tors (2P) and (3P) of test harness P.
5) 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 pas-
senger’s airbag
module. <Ref. to
AB-16, Passen-
ger’s Airbag Mod-
ule.>

Go to step

3.

1 2 3 4

4

3

2

1

4

3

18 19 20

21 22 23 24 25 26 27 28

1 2 3

5 6 7 8

10

9

4

11 12 13 14

16 17

15

29 30

AB9

AB6

AB9

AB6

1

2

AB-02488

AIRBAG CM

PASSENGER'S AIRBAG MODULE

AB(diag)-65

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

3

CHECK AIRBAG MAIN HARNESS (PASSEN-
GER’S AIRBAG HARNESS).
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-
nectors (2P) and (3P) of test harness P.
3) Remove the instrument panel lower cover
and column cover, and disconnect the connec-
tor (AB7) from (AB2).
4) Disconnect the connectors (AB6, AB17,
AB18) from the airbag control module, and con-
nect the connector (1AH) in the test harness
AH.
5) Connect the connector (2AH) in the test har-
ness AH and the connector (1AG) in the test
harness AG.
6) Measure the resistance between connector
(3AG) of test harness AG and connector (2P) of
test harness P.

Connector & terminal

(3AG) No. 9 — (2P) No. 1:
(3AG) No. 7 — (2P) No. 2:

Is the resistance less than 10

Ω?

Go to step

4.

Replace the airbag
main 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)-66

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

I: DTC 21 AIRBAG ECM FAILURE

DTC DETECTING CONDITION:

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.

J: DTC 22 FRONT AIRBAG FIRING OUTPUT

DTC DETECTING CONDITION:

This DTC is indicated when the front airbag module and the pretensioner are deployed.

Once this DTC is displayed, the memory cannot be cleared. Therefore replace the following parts.

• Airbag control module <Ref. to AB-21, Airbag Control Module.>

• Driver’s airbag module <Ref. to AB-15, Driver’s Airbag Module.>

• Passenger’s airbag module <Ref. to AB-16, Passenger’s Airbag Module.>

• Front sub sensor of both sides. <Ref. to AB-22, Front Sub Sensor.>

• Front outer seat belt with pretensioner of both sides. <Ref. to SB-18, Front Seat Belt.>

• Steering roll connector <Ref. to AB-26, Roll Connector.>

• Occupant detection system (passenger’s seat cushion & frame assembly) <Ref. to SE-6, Front Seat.>

Step

Check

Yes

No

1

CHECK IF DTC 21 IS INDICATED.
Read the DTC. <Ref. to AB(diag)-26, READ
DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>

Does the Subaru Select Moni-
tor display DTC21?

Replace the airbag
control module.
<Ref. to AB-21,
Airbag Control
Module.>

Perform the Clear
Memory Mode.
<Ref. to AB(diag)-
26, CLEAR MEM-
ORY MODE,
OPERATION, Sub-
aru Select Moni-
tor.>