light SUBARU FORESTER 2004 Service User Guide

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-5
AIRBAG SYSTEM (DIAGNOSTIC)
General Description
 If any damage, opening, or rust is found on the
airbag system wiring harness, do not attempt to re-
pair using soldering equipment. Be sure to replace
the faulty harness with a new genuine part.
 Install the wiring harness securely with the spec-
ified 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. Either of the airbag modules for driver, passen-
ger or side, or pretensioner must not be disassem-
bled.
 The airbag module cannot be used again once
inflated.
 After removal, keep the airbag module with the
pad facing upward on a dry, clean, and flat surface
away from heat and light sources, and moisture
and dust.
 Do not check continuity of either of the airbag
modules for driver, passenger or side, or preten-
sioner.
AB-00124
AB-00125
AB-00126
AB-00127
AB-00056
AB-00006

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)

AB-34
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
11.Airbag Warning Light Failure
A: AIRBAG WARNING LIGHT REMAINS ON.
DIAGNOSIS:
 Airbag warning light unit is faulty.
 Airbag control module to airbag warning light circuit is shorted or open.
 Grounding circuit is faulty.
 Airbag control module is faulty.
 (AB1) and (B31) are not connected properly.
 (AB3) is not connected properly to the airbag control module.
CAUTION:
 Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from battery, and wait more than 20 seconds before starting to work.
 After replacing the airbag module, seat belt pretensioner, roll connector, control module or sensor,
reconnect each part and confirm that the airbag warning light operates properly.
 When inspecting the airbag main harness, disconnect the airbag module connector of the driver
and passenger seats for safety reasons.

AB-35
AIRBAG SYSTEM (DIAGNOSTIC)
Airbag Warning Light Failure
1. LHD MODEL
WIRING DIAGRAM:
Step Check Yes No
1 CHECK POOR CONTACT IN CONNECTORS
(AB1) AND (B31).
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than
20 seconds.
2) Remove the side sill cover. (Driver’s side)
3) Confirm that firm contact is secured
between connectors (AB1) and (B31).Is the poor contact in connec-
tors (AB1) and (B31)?Repair the body
harness or replace
the airbag main
harness with body
harness.Go to step 2.
AB-00739
12
34561
2345678910123456789101112131415161718192021222324252627282930
B31 i11AB3
i10
B:
C: i10
i11
AIRBAG
WARNING
LIGHTCOMBINATION
METERB9
B8
B10
NO.14
i3B38 28
i2B37 19
5
AIRBAG CONTROL MODULEAB3
B31
AB1
3
3
AIRBAG
CIRCUIT
E
BATTERY
1234567891011121314151617
1819202122232425262728
IGNITION
SWITCH
B: C: