Subaru Legacy (2005 year). Manual — part 891
AIRBAG SYSTEM (DIAGNOSTICS)
AB(diag)
Page
Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . . 2
Check List for Interview. . . . . . . . . . . . . . . . . . . ...3
General Description . . . . . . . . . . . . . . . . . . . . . 4
Electrical Component Location . . . . . . . . . . . . . . . . .18
Airbag Control Module I/O Signal. . . . . . . . . . . . . . . ..22
Airbag Connector . . . . . . . . . . . . . . . . . . . . . ..26
Airbag Warning Light Illumination Pattern. . . . . . . . . . . . .29
Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . ..30
Inspection Mode. . . . . . . . . . . . . . . . . . . . . . 32
Clear Memory Mode. . . . . . . . . . . . . . . . . . . . ..33
Airbag Warning Light Failure. . . . . . . . . . . . . . . . . .34
List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .38
Diagnostic Chart with Trouble Code . . . . . . . . . . . . . . .42
AB(diag)-2
AIRBAG SYSTEM (DIAGNOSTICS)
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
Check
Yes
No
1
READ DTC.
<Ref. to AB(diag)-30, Read Diagnostic Trouble
Code (DTC).>
Is the normal code detected?
Finish the diagno-
sis.
2
READ DTC.
<Ref. to AB(diag)-30, Read Diagnostic Trouble
Code (DTC).>
Is DTC displayed?
Go to “Airbag
Warning Light Fail-
ure” <Ref. to
AB(diag)-34, Air-
bag Warning Light
Failure.>.
3
PERFORM THE DIAGNOSIS.
1) Judge the possible cause from “List of
Diagnostic Trouble Code” <Ref. to AB(diag)-
38, List of Diagnostic Trouble Code (DTC).>.
2) Inspect the DTC using “List of Diagnostic
Trouble Code (DTC)”.
3) Repair the trouble cause.
4) Perform the clear memory mode. <Ref. to
AB(diag)-33, Clear Memory Mode.>
5) Perform the inspection mode. <Ref. to
AB(diag)-32, Inspection Mode.>
6) Read any DTC again.
Is DTC displayed?
Perform the proce-
dure 1) to 5) in
step 3.
Finish the diagno-
sis.
AB(diag)-3
AIRBAG SYSTEM (DIAGNOSTICS)
Check List for Interview
2. Check List for Interview
A: CHECK
Customer’s Name
Inspector’s Name
Date Vehicle Brought In
/
/
Registration No.
Odometer Reading
km
miles
V.I.N.
Date Problem Occurred
/
/
Registration Year
/
/
Weather
❏ Fine
❏ Cloudy
❏ Rainy
❏ Snowy
❏ Others:
Temperature
°C (°F)
Road Condition
❏ Level road
❏ Uphill
❏ Downhill
❏ Rough road
❏ Others:
Vehicle Operation
❏ Starting
❏ Idling
❏ Driving (❏ Constant speed
❏ Acceleration
❏ Deceleration
❏ Steering wheel turn
❏ Others:
)
Details of Problem
Check Airbag Warning Light
❏ Normal (After turning the ignition switch to ON, illuminates for 6 seconds then goes off.)
❏ Remains ON
❏ Remains OFF
DTC output
❏ Normal Code
❏ DTC: (Code:
)
AB(diag)-4
AIRBAG SYSTEM (DIAGNOSTICS)
General Description
3. General Description
A: CAUTION
• When servicing a vehicle, be sure to turn the ig-
nition switch to OFF, disconnect the ground cable
from battery, and wait for more than 20 seconds
before starting work.
• The airbag system is equipped with a backup
power source. If the airbag system is serviced with-
in 20 seconds from the ground cable is disconnect-
ed, it may inflate.
• If sensors, airbag module, airbag control module,
pretensioner and harness are deformed or dam-
aged, replace them with new parts.
• Do not use the airbag system and pretensioners
on other vehicles. When replacing parts, be sure to
replace them with new ones.
• When checking the airbag system, be sure to
use a digital circuit tester. Use of an analog circuit
tester may cause the airbag to activate erroneous-
ly.
• When checking, use a test harness (1). Do not
directly apply the tester probe to any connector ter-
minal of the airbag because damage on the con-
nector cause malfunction.
• Do not drop the airbag module, subject them to
high temperature over 93
°C (199°F), or let water,
oil or grease get on them; the internal parts may be
damaged and reliability greatly lowered.
AB-00120
AB-00121
AB-00122
(1)
AB-00123
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