Subaru Legacy IV (2008 year). Manual - part 1010

AB(diag)-28

Subaru Select Monitor

AIRBAG SYSTEM (DIAGNOSTICS)

2. WITHOUT DTC

DETECTING CONDITION:
• Defective combination meter
• Open circuit in harness
TROUBLE SYMPTOM:
• Airbag warning light remains ON.
• “No diagnostic Code Present” will be displayed on the Subaru Select Monitor.

NOTE:
• For detailed operation procedures, refer to “Airbag Warning Light Failure”. <Ref. to AB(diag)-33, Airbag
Warning Light Failure.>
• “No diagnostic Code Present” will be displayed on the Subaru Select Monitor. is displayed on Subaru Se-
lect Monitor, the system is operating properly.

10

CHECK HARNESS BETWEEN THE AIRBAG 
CONTROL MODULE AND DATA LINK CON-
NECTOR.
1) Turn the ignition switch to OFF, disconnect 
the battery ground cable, and wait for 20 sec-
onds or more.
2) Disconnect the connectors (AB6, AB17, 
AB18) from airbag control module.
3) Connect the test harness AG connector 
(1AG) to the connectors (AB6, AB17, AB18).
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 

:? Go to step 11.

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.

11

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 12.

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

12

CHECK BETWEEN THE 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 

:? Go to step 13.

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

13

CHECK POOR CONTACT IN CONNECTOR.

Is there poor contact in the con-
trol module power supply, 
ground circuit and data link con-
nector?

Repair the connec-
tor. (For airbag 
system connec-
tors, do not repair 
but replace the 
entire harness.)

Replace the airbag 
control module 
only. <Ref. to AB-
20, REMOVAL, Air-
bag Control Mod-
ule.>

Step

Check

Yes

No

AB(diag)-29

Read Diagnostic Trouble Code (DTC)

AIRBAG SYSTEM (DIAGNOSTICS)

8. Read Diagnostic Trouble 

Code (DTC)

A: OPERATION

For details concerning DTC reading procedure, re-
fer to “Subaru Select Monitor”. <Ref. to AB(diag)-
24, Subaru Select Monitor.>

AB(diag)-30

Inspection Mode

AIRBAG SYSTEM (DIAGNOSTICS)

9. Inspection Mode

A: PROCEDURE

Recreate the circumstance by referring to the con-
ditions described in the checklist.

AB(diag)-31

Clear Memory Mode

AIRBAG SYSTEM (DIAGNOSTICS)

10.Clear Memory Mode

A: OPERATION

• Clear the memory in the following steps after the
malfunction is repaired.
• For details concerning DTC clear operation, refer
to “Subaru Select Monitor”. <Ref. to AB(diag)-24,
Subaru Select Monitor.>