Subaru Legacy III (2000-2003 year). 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