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.

Go to step 2.

2

Read DTC.
<Ref. to AB-20, Read Diagnostic Trouble Code
(DTC).>

Is the DTC being detected?

Go to step 3.

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

AB-22, Clear Memory Mode.>

5) Perform the inspection mode. <Ref. to AB-

21, Inspection Mode.>

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