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Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 622

AB(diag)-27

Subaru Select Monitor

AIRBAG SYSTEM (DIAGNOSTICS)

3. DISPLAY OF STATUS INFORMATION

Check the operating condition of each sensor in the event of malfunction in the seat belt buckle switch, or

when the seat belt buckle switch has been replaced.

1) On «Main Menu» display, select {Each System Check}.

2) On «System Selection Menu» display, select {Airbag System}.

3) On «Airbag System» display, select {Status Data}.

The following table is for support data.

*1: Displayed when it is initial.
*2: Seat position sensor not supported
*3: Seat belt fastened
*4: Seat belt not fastened
*5: Displayed when data other than belt fastened or not fastened, such as breakdowns is input.
*6: Seat belt buckle switch not supported
*7: Passenger’s airbag operating state
*8: Passenger’s airbag non-operating state

NOTE:

For detailed operation procedures, refer to “PC application help for Subaru Select Monitor”.

Item

Display

Seat position sensor LH

––

Seat position sensor RH

––

Seat belt buckle switch LH

––

Seat belt buckle switch RH

Equipped

/Unequipped

/Other

/Initial setting

/––

Passenger’s airbag control status

/OFF

/Initial setting

AB(diag)-28

Subaru Select Monitor

AIRBAG SYSTEM (DIAGNOSTICS)

B: INSPECTION

1. COMMUNICATION FOR INITIALIZING IMPOSSIBLE

DETECTING CONDITION:

Defective harness connector

TROUBLE SYMPTOM:

Communication is impossible between the airbag control module and the Subaru Select Monitor.

WIRING DIAGRAM:

Airbag system <Ref. to WI-82, WIRING DIAGRAM, Airbag System.>

Step

Check

Yes

CHECK IGNITION SWITCH.

Is the ignition switch ON?

Go to step

Turn the ignition
switch to ON, and
select the airbag
mode using the
Subaru Select
Monitor.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

MAIN SBF

SBF-6

No.25

B40

B31

AB1

No.13

DATA LINK

CONNECTOR

BATTERY

IGNITION

SWITCH

AB6

AIRBAG CONTROL MODULE

B40

AB6

AB-02103

18 19 20

21 22 23 24 25 26 27 28

1 2 3

5 6 7 8

11 12 13 14

16 17

29 30

B31

3 4 5 6

AB(diag)-29

Subaru Select Monitor

AIRBAG SYSTEM (DIAGNOSTICS)

CHECK BATTERY.
1) Turn the ignition switch to OFF.
2) Measure the battery voltage.

Is the voltage 11 V or more?

Go to step

Charge or replace
the battery.

CHECK BATTERY TERMINAL.

Is there poor contact at battery
terminal?

Repair or tighten
the battery termi-
nal.

Go to step

CHECK SUBARU SELECT MONITOR COM-
MUNICATION.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check
whether communication to other systems can
be executed normally.

Is the system name displayed
on Subaru Select Monitor?

Go to step

11.

Go to step

CHECK SUBARU SELECT MONITOR.

Is Subaru Select Monitor pow-
ered on?

Go to step

CHECK FUSE.
Remove fuse No. 13 from the fuse & relay box,
and perform visual inspection.

Is the fuse OK?

Repair the harness
between the bat-
tery and the data
link connector.

Replace the fuse. If
the fuse is blown
out again, check
the power supply
circuit.

CHECK AIRBAG CONTROL MODULE CON-
NECTOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Confirm that the connectors of airbag con-
trol module (AB6, AB17, AB18) are securely
connected.

Is the connector of the airbag
control module securely con-
nected?

Go to step

Connect the con-
nector of the airbag
control module.

CHECK SUBARU SELECT MONITOR COM-
MUNICATION.
1) Disconnect the airbag control module con-
nector.
2) Connect the battery ground terminal.
3) Turn the ignition switch to ON.
4) Check whether communication to other sys-
tems can be executed normally.

Is the system name displayed
on Subaru Select Monitor?

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

Go to step

CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the airbag control module,
VDCCM&H/U, body integrated unit, ECM, and
TCM.
3) Measure the resistance between data link
connector and chassis ground.

Connector & terminal

(B40) No. 7 — Chassis ground:

Is the resistance 1 MΩ or
more?

Go to step

10.

Repair the harness
and connector
between each con-
trol module and
data link connec-
tor. (Replace the
entire harness if
repair is necessary
for airbag har-
ness.)

CHECK OUTPUT SIGNAL TO THE AIRBAG
CONTROL MODULE.
1) Turn the ignition switch to ON in the condi-
tion of step 9.
2) Measure the voltage between data link con-
nector and chassis ground.

Connector & terminal

(B40) No. 7 (+) — Chassis ground (–):

Is the voltage less than 1 V?

Repair each con-
trol module.

Repair the harness
and connector
between each con-
trol module and
data link connec-
tor. (Replace the
entire harness if
repair is necessary
for airbag har-
ness.)

Step

Check

Yes

AB(diag)-30

Subaru Select Monitor

AIRBAG SYSTEM (DIAGNOSTICS)

CHECK FUSE.
Remove fuse No. 25 from the fuse & relay box,
and perform visual inspection.

Is the fuse OK?

Go to step

12.

Replace the fuse. If
the fuse is blown
out again, check
the power supply
circuit.

Is the connector of the airbag
control module securely con-
nected?

Go to step

13.

Connect the con-
nector of the airbag
control module.

CHECK THE HARNESS BETWEEN THE AIR-
BAG CONTROL MODULE AND DATA LINK
CONNECTOR.
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 (AB6, AB17, AB18).
3) Connect the connector (2AH) in the test har-
ness AH and the connector (1AG) in the test
harness AG.
4) Measure the resistance between connector
(4AG) in the test harness AG and the data link
connector.

Connector & terminal

(4AG) No. 1 — (B40) No. 7:

Is the resistance less than 10

Ω?

Go to step

14.

Repair the harness
between the airbag
control module and
the data link con-
nector. Or replace
the airbag main
harness along with
the bulkhead har-
ness.

CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(2AG) in the test harness AG and chassis
ground.

Connector & terminal

(2AG) No. 1 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step

15.

Repair the harness
between the airbag
control module and
the battery. Or
replace the airbag
main harness
along with the bulk-
head harness.

CHECK BETWEEN AIRBAG CONTROL
MODULE AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance between connector
(2AG) in the test harness AG and chassis
ground.

Connector & terminal

(2AG) No. 4 — Chassis ground:
(2AG) No. 3 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step

16.

Repair the harness
between the airbag
control module and
the chassis
ground. Or replace
the airbag main
harness along with
the bulkhead har-
ness.

CHECK POOR CONTACT OF CONNECTOR. Is there poor contact of the con-

trol module power supply,
ground circuit and data link con-
nector?

Repair the connec-
tor. (Replace the
harness instead of
repairing the air-
bag system con-
nector.)

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

Step

Check

Yes

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