Page 25 of 2453
AB-26
Front Sub Sensor
AIRBAG SYSTEM
Page 26 of 2453

AB(diag)-2
Basic Diagnostic Procedure
AIRBAG SYSTEM (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
Step Check Yes No
1CHECK WARNING LIGHT.
Check whether the airbag warning light in the
combination meter is lit.
Does the airbag warning light
illuminate?
Go to step 2.Perform the diag-
nosis according to
phenomenon of
the problem.
2READ DTC.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON, and the Sub-
aru Select Monitor power switch to ON.
4) Read the DTC.
OPERATION, Read Diagnostic Trouble Code
(DTC).>
NOTE:If the communication function of the Subaru Se-
lect Monitor cannot be executed normally,
check the communication circuit.
AB(diag)-33, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
5) Record all DTCs and freeze frame data.
Is DTC displayed? Go to step 3.
40, Airbag Warn-
ing Light Fail-
ure.>Go to “Airbag
Wa r ni n g L ig h t Fa i l-
ure”.
3PERFORM DIAGNOSIS.
1) Judge the possible cause from “List of
Diagnostic Trouble Code”
45, List of Diagnostic Trouble Code (DTC).>.
2) Inspect the DTC using “List of Diagnostic
Tr o u b l e C o d e ( D T C ) ” .
3) Repair the trouble cause.
4) Perform the clear memory mode.
AB(diag)-38, Clear Memory Mode.>
5) Perform the inspection mode.
AB(diag)-37, Inspection Mode.>
6) Read any other DTCs displayed.
Is DTC displayed? Perform the proce-
dure 1) to 5) in
step 3.
Finish the diagno-
sis.
Page 27 of 2453
AB(diag)-3
Check List for Interview
AIRBAG SYSTEM (DIAGNOSTICS)
2. Check List for Interview
A: CHECK
Customer's name Inspector's name
Date vehicle brought in / / Registration No.
Odometer readingkm
milesV. I . N .
Date problem occurred / / Registration year / /
Weather
Fine
Cloudy
Rainy
Snowy
Others:
Te m p e r a t u r e ° C ( ° F )
Road condition
Flat road
Uphill
Downhill
Gravel road
Others:
Ve h i c l e o p e r a t i o n
Starting
Idling
Driving
Constant speed
Accelerating
Decelerating
Turning
Others:
Details of problem
Airbag warning light operation
Normal (After turning the ignition switch to ON, lit for approximately 6 seconds and goes off.)
Remains ON
Light OFF
DTC output OK code
DTC: (Code: )
Page 28 of 2453

AB(diag)-4
General Description
AIRBAG SYSTEM (DIAGNOSTICS)
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 fitted with a backup power
source. After disconnecting the battery ground ca-
ble, the airbag may deploy if you do not wait for
more than 20 seconds before starting the service of
airbag system.
•If sensors, airbag module, airbag control module,
pretensioner or harness is deformed or damaged,
replace with new part.
•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 erroneously
due to a minimal current inside tester.
•When checking, use a test harness (1). Damage
to connector terminal causes malfunction. Do not
directly put the tester probe on airbag connector
terminal.
•Do not drop the airbag system parts, or keep
them at 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.
IN-00203
AB-00120
AB-00121
AB-00122
(1)
AB-00123
Page 29 of 2453
AB(diag)-5
General Description
AIRBAG SYSTEM (DIAGNOSTICS)
•If damage, open circuit or rust is found on airbag
system wire harness, do not use a soldering equip-
ment to repair. Replace the faulty harness with a
new genuine part.
•Install the wire harness securely with the speci-
fied clips to avoid interference or tangled with other
parts.
•Do not allow water or oil to come in contact with
the connector terminals. Also do not touch the con-
nector terminals.
•Either of the airbag modules for driver’s, passen-
ger’s, side or curtain, or the pretensioner must not
be disassembled.
•The airbag module cannot be used again if de-
ployed once.
•After removal, keep the airbag module with the
pad side facing upward on a dry, clean and flat sur-
face away from heat, light sources, moisture and
dust.
•Do not check continuity of the airbag modules for
driver’s side, passenger’s side and curtain, or the
pretensioner.
AB-00124
AB-00125
AB-00126
AB-00779
AB-00056
AB-00006
Page 30 of 2453
AB(diag)-6
General Description
AIRBAG SYSTEM (DIAGNOSTICS)
•The removed front seat with airbag module must
be kept at least 200 mm (8 in) away from walls and
other objects.
•When painting or performing sheet metal work
on the front part of the vehicle, including the front
wheel apron, front fender and front side frame, re-
move the front sub sensors and wire harness of air-
bag system.
•When painting or performing sheet metal work
on the side of the vehicle, including the side sill,
center pillar and front and rear doors, remove the
side airbag sensors and wire harness of the airbag
system.
•Do not discard undeployed airbag module. They
could easily cause a serious accident if accidentally
deployed.
(1) 200 mm (8 in) or more
AB-00128
(1)
AB-00129
Page 31 of 2453
AB(diag)-7
General Description
AIRBAG SYSTEM (DIAGNOSTICS)
•When storing a removed airbag module, do not place any objects on it or pile them up. If the airbag inflates
for some reason when it is placed with its pad side facing downward or under any object, a serious accident
may result.
(1) Driver’s airbag module (2) Passenger’s airbag module
AB-00130
(2)
(1)
Page 32 of 2453
AB(diag)-8
General Description
AIRBAG SYSTEM (DIAGNOSTICS)
B: INSPECTION
Measure the battery voltage and check electrolyte.
Standard voltage: 12 V
Specific gravity: Above 1.260
C: PREPARATION TOOL
CAUTION:
To measure the voltage and resistance of airbag system component, be sure to use the specified test
harness.
1. SPECIAL TOOL
ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS
18482AA010 CARTRIDGE Troubleshooting for the electrical system.
22771AA030 SUBARU SELECT
MONITOR KIT
Tr o u b l e s h o o t i n g f o r t h e e l e c t r i c a l s y s t e m .
ST18482AA010
ST22771AA030