Subaru Legacy III (2000-2003 year). Service manual — part 894
AB-2
AIRBAG SYSTEM (DIAGNOSTICS)
BASIC DIAGNOSTIC PROCEDURE
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
Value
Yes
No
1
Read DTC.
<Ref. to AB-20, Read Diagnostic Trouble Code
(DTC).>
Is the normal code being
detected?
Finish the diagno-
sis.
2
Read DTC.
<Ref. to AB-20, Read Diagnostic Trouble Code
(DTC).>
Is the DTC being detected?
Go to “Airbag
Warning Light Fail-
ure”.<Ref. to AB-
24, Airbag Warn-
ing Light Failure.>
3
Perform the diagnosis.
1) Judge the possible cause from “List of
Diagnostic Trouble Code (DTC)” <Ref. to
AB-28, List of Diagnostic Trouble Code
(DTC).> .
2) Inspect using “Diagnostic Chart with Diag-
nostic Trouble Code (DTC)”.
3) Repair the cause of the trouble.
4) Perform the clear memory mode. <Ref. to
5) Perform the inspection mode. <Ref. to AB-
6) Read DTC.
Is the DTC being detected?
Perform the proce-
dure 1) to 5) in
step 3.
Finish the diagno-
sis.
AB-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
Vin No.
Date Problem Occurred
/
/
Registration Year
/
/
Weather
❏
Fine
❏
Cloudy
❏
Rainy
❏
Snowy
❏
Other:
Temperature
°
C (
°
F)
Road Condition
❏
Level road
❏
Uphil
❏
Downhill
❏
Rough road
❏
Others:
Vehicle Operation
❏
Starting
❏
Idling
❏
Driving (
❏
Constant Speed
❏
Acceleration
❏
Deceleration
❏
Steering wheel turn
❏
Other:
)
Details of Problem
Check Airbag Warning Light
❏
Remains ON
❏
Remains OFF
Check DTC
❏
Normal Code
❏
Trouble Code: (Code:
)
AB-4
AIRBAG SYSTEM (DIAGNOSTICS)
GENERAL DESCRIPTION
3. General Description
A: CAUTION
• When servicing a vehicle, be sure to turn the ig-
nition switch OFF, disconnect the ground cable
from the battery, and wait for more than 20 seconds
before starting work.
• The airbag system is fitted with a backup power
source. If the airbag system is serviced within 20
seconds after the ground cable is disconnected, it
may inflate.
• If the airbag warning light illuminates, repair the
vehicle immediately. Airbag or pretensioner may in-
flate incorrectly, or not inflate in collision.
• If sensors, airbag module, airbag control module
pretensioner, and harness are deformed or dam-
aged, replace them with new genuine parts.
• Do not use the airbag system and pretensioners
on other vehicles. When replacing parts, be sure to
replace them with new parts.
• When checking the system, be sure to use a dig-
ital circuit tester.
Use of an analog circuit tester may cause the air-
bag to activate erroneously.
• When checking, use a test harness. Do not di-
rectly apply the tester probe to any connector termi-
nal of the airbag.
AB-00002
AB-00120
(1) Test harness
AB-00121
AB-00122
( 1 )
AB-5
AIRBAG SYSTEM (DIAGNOSTICS)
GENERAL DESCRIPTION
• Do not drop the airbag modulator parts, subject
them to high temperature over 93
°
C (199
°
F), or let
water, oil, or grease get on them; otherwise, the in-
ternal parts may be damaged and reliability greatly
lowered.
• If any damage, opening or rust is found on the
airbag system wire harness, do not attempt to re-
pair using soldering equipment. Be sure to replace
the faulty harness with a new genuine part.
• Install the wire harness securely with the speci-
fied clips to avoid interference or tangled up with
other parts.
• Do not allow water or oil to come in contact with
the connector terminals. Do not touch the connec-
tor terminals.
• The airbag module (driver, passenger, and side,
pretensioner) must not be disassembled.
• The airbag module cannot be used again once
inflated.
AB-00123
AB-00124
AB-00125
AB-00126
AB-00127
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