2004 SUBARU FORESTER warning light

AB-3
AIRBAG SYSTEM
General Description
B: 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. 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 or harness are deformed or damaged,
replace them with new parts.
 When checking the airbag system, be sure to
use a digital circuit tester.
Infinitesimal electric current in 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. Damage to the connector termi-
nal may cause the airbag to activate erroneously.
 Do not check continuity of either of the airbag
modules for driver, passenger or side, or preten-
sioner.
FU-00009
AB-00120
AB-00121
AB-00122
(1)
AB-00006

AIRBAG SYSTEM (DIAGNOSTIC)
AB
Page
1. Basic Diagnostic Procedure ........................................................................2
2. Check List for Interview ...............................................................................3
3. General Description ....................................................................................4
4. Electrical Components Location................................................................19
5. Airbag Control Module I/O Signal..............................................................21
6. Airbag Connector ......................................................................................27
7. Airbag Warning Light Illumination Pattern .................................................30
8. Read Diagnostic Trouble Code (DTC) ......................................................31
9. Inspection Mode ........................................................................................32
10. Clear Memory Mode..................................................................................33
11. Airbag Warning Light Failure.....................................................................34
12. List of Diagnostic Trouble Code (DTC) .....................................................43
13. Diagnostic Procedure with Diagnostic Trouble Code (DTC) .....................46

AB-2
AIRBAG SYSTEM (DIAGNOSTIC)
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
Step Check Yes No
1 READ DTC.
(DTC).>Is the normal code detected? Finish the diagno-
sis.Go to step 2.
2 READ DTC.
(DTC).>Is DTC displayed? Go to step 3.Replace the airbag
warning light.
Airbag Warning
Light Failure.>
3 PERFORM THE DIAGNOSIS.
1) Judge the possible cause from “List of
Diagnostic Trouble Code (DCT)” 43, List of Diagnostic Trouble Code (DTC).>
2) Inspect using “Diagnostic Procedure with
Diagnostic Trouble Code (DTC)”.
3) Repair the cause of the trouble.
4) Perform the clear memory mode. AB-33, Clear Memory Mode.>
5) Perform the inspection mode. 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-3
AIRBAG SYSTEM (DIAGNOSTIC)
Check List for Interview
2. Check List for Interview
A: CHECK
Customer’s Name Inspector’s Name
Date Vehicle Brought In / / Registration No.
Odometer Readingkm
milesVIN
Date Problem Occurred / / Registration Year / /
Weather❏ Fine ❏ Cloudy ❏ Rainy ❏ Snowy ❏ Other:
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, lit for 7 seconds and goes off.)
❏ Remains ON❏ Remains OFF
Check DTC❏ Normal Code❏ DTC: (Code: )

AB-24
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Control Module I/O Signal
2. RHD MODEL
A/B(R)-01A/B(R)-01
WI-03206
7
6
2
3
8
GWGY
GY
R
GRGR
RGRL
W
YWLgRBR
10
BB20
65143
6
B
BW
2
2753192
IG
IGNITION RELAY
(IG)FB-36
F/B FUSE No. 14
(IG)FB-20
F/B FUSE No. 11
(IG)FB-21
F/B FUSE No. 6
(IG)
L
GR
GW
W
B
GYGY16GY
GR
B
B9
C8
B10
1
2
L
W
BL
BL
REF. TO GND(R)-04
REF. TO E/G(RNA)-05REF. TO E/G(RTB20)-05REF. TO E/G(RTB25)-05
CHECK
CONNECTOR
DIAGNOSIS
CONNECTOR
DIAGNOSIS
TERMINAL
B31
AB1
(GRAY)
B79
AIRBAG CONTROL MODULE
AB3
B81
B82
B79
B38i3
TO POWER SUPPLY ROUTING
1234567891011121314
GY
(BLACK)B82
B
REF. TO GND(R)-05
B
i3
B31(GREEN) i11 C:
B:
(GREEN)
i10
AIRBAG
CIRCUIT AIRBAG WARNING
LED LIGHT
COMBINATION
METER B: C:
i11i10
12
34561
3456212345678910
123456789101112131415161718192021222324252627282930
(YELLOW)
AB3
1234567891011121314151617
1819202122232425262728
(YELLOW)
219
32
1234
5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25

AB-30
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Illumination Pattern
7. Airbag Warning Light Illumi-
nation Pattern
A: INSPECTION
Keep the ignition switch to ON, and confirm that the
airbag warning light remains off approx. 6 seconds
after being turned on.
(1) Airbag warning light
(2) Approx. 6 seconds
(3) Ignition switch ON
AB-00135
(3)
(1)(2)
ON
OFF

AB-31
AIRBAG SYSTEM (DIAGNOSTIC)
Read Diagnostic Trouble Code (DTC)
8. Read Diagnostic Trouble
Code (DTC)
A: OPERATION
1) Turn the ignition switch to ON.
2) Connect the ground terminal to diagnosis con-
nector terminal No. 1 in the instrument panel lower
cover area.3) Read the DTC by identifying the way airbag
warning light flashes.
The airbag warning light flashes a code corre-
sponding to the faulty parts.
The long segment (1.2 sec on) indicates a “ten”,
and the short segment (0.3 sec on) indicates a
“one”.
NOTE:
 “List of Diagnostic Trouble Code (DTC)” AB-43, List of Diagnostic Trouble Code (DTC).>
 “Airbag Warning Light Failure” Airbag Warning Light Failure.>
4) Turn the ignition switch to OFF, and disconnect
the ground terminal from the diagnosis connector
terminal No 1.
5) Wind tape around the ground terminal and return
it to its original position.
(1) Diagnosis connector
(2) Ground terminal
AB-00136B821
34 562(2) (1)
(1) Example (3) Flashing code 21: (5) Sec
(2) Flashing code 12: (4) Flashing normal code:
(2) (1)
(3)
(4)ON
OFF
ON
OFF
ON
OFF(5)
(5)
(5) 10
1.2
10 10 10 101
11 110 11
1.2 1.2
0.6 0.60.3 0.3 0.3 1.20.3 0.31.2
0.3 0.3
AB-00137

AB-33
AIRBAG SYSTEM (DIAGNOSTIC)
Clear Memory Mode
10.Clear Memory Mode
A: OPERATION
1) Turn the ignition switch to ON.
2) Connect the ground terminal (ground, terminal
“A”) to diagnosis connector terminal No. 1 in the in-
strument panel lower cover area.
3) While the airbag warning light flashes, connect
another ground terminal (ground, terminal “B”) to
diagnosis connector terminal No. 2.
4) Once the memory is erased, the airbag warning
light returns to the normal flash rate (0.6 sec on).
The failure to recover the normal flash rate indi-
cates that trouble parts still remain. Having re-
paired such parts, erase the memory again and
confirm that the normal flash rate has returned.
5) When the memory has been cleared, disconnect
the ground terminal from the diagnosis connector.
6) Wind tape around the ground terminal and return
it to its original position.
(1) Diagnosis connector
(2) Ground terminal “B”
(3) Ground terminal “A”
AB-00138B821
34 562(3)(2)
(1)