1999 SUBARU FORESTER light

4. Diagnostics Chart for On-
board Diagnostic System
A: BASIC DIAGNOSTICS
PROCEDURE
4A1 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
1) Turn ignition switch to ON (engine OFF).
2) Check airbag warning light illuminates.
:Does airbag warning light stay ON
after about 7 seconds or remain OFF,
or come back ON after 30 seconds?
: Repair and replace. [T4D0].>
: Go to step4A2.
4A2 : CHECK TROUBLE CODE INDICATES.
Perform ON-BOARD DIAGNOSTICS. [T4B0].>
:Does trouble code indicate? 5-5 [T5A0].>
: Repair and replace. [T5X0].> Go to step4A3.
: Repair and replace. [T5Y0].> Go to step4A3.
4A3 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
1) Turn ignition switch to ON (engine OFF).
2) Check airbag warning light illuminates.
:Does airbag warning light stay ON
after about 7 seconds or come back
ON after 30 seconds?
: Repair and replace. [T4D0].>
: Go to step4A4.4A4 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
Check airbag warning light illuminates.
:Does airbag warning light come ON
for about 7 seconds, then go out and
stay out?
: Perform clear memory. [T4C0].>
: Go to step4A1.
B: ON-BOARD DIAGNOSTIC
When the airbag system is in functioning condition,
the airbag warning light will remain on for about 7
seconds and go out when the ignition switch is set
to ON.
If there is any malfunction, the airbag warning light
will either stay on or off continuously. In such
cases, perform on-board diagnostic in accordance
with the specified procedure to determine trouble
codes.
1) Turn ignition switch ON (with engine OFF).
2) Connect DIAG. terminal to No. 1 terminal of
diagnosis connector located inside lower cover.
B5M0115D
3) Check in accordance with the trouble code indi-
cated by the AIRBAG warning light, and record the
trouble codes.
4) Turn the ignition switch ªOFFº and remove the
DIAG. terminal from No. 1 terminal of diagnosis
connector.
11
[T4B0]5-5DIAGNOSTICS
4. Diagnostics Chart for On-board Diagnostic System

C: CLEAR MEMORY
After eliminating problem as per trouble code, clear
memory as follows:
1) Make sure ignition switch is ON (and engine
off). Connect one DIAG. terminal ªAº on diagnosis
connector terminal No. 1.
While warning light is flashing, contact the other
DIAG. terminal ªBº on terminal No. 2 for at least
three seconds.
B5M0116D
2) After memory is cleared, normal warning light
flashing rate resumes. (Warning light flashes every
0.6 seconds ON-OFF operation.) Memory cannot
be cleared if any problem exists.
3) After clear memory and then DIAG. terminals
ªAº and ªBº, extract from diagnosis connector.
D: DIAGNOSTICS PROCEDURE
4D1 : CHECK TROUBLE CODE INDICATES.
1) Perform on-board diagnostic. [T4B0].>
2) Check trouble code indicates.
:Are trouble codes 11, 12, 15 or 16
indicated?
: Go to step4D2.
: Perform diagnostics and repair accord-
ing to indicated trouble code. 5-5 [T5A0].>
4D2 : CHECK TROUBLE CODE INDICATES.
Check trouble code indicates.
:Are trouble codes 12, 16 indicated?

: Go to step4D3.
: Go to step4D4.
12
5-5[T4C0]DIAGNOSTICS
4. Diagnostics Chart for On-board Diagnostic System

4D3 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
1) Turn ignition switch to OFF. Disconnect battery
ground cable, and wait 20 seconds.
2) Remove glove box and
disconnect passenger's airbag module connector
(AB9) to (AB10).
3) Connect test harness F connector (1F) to
(AB9).
4) Connect airbag resistor to test harness F con-
nector (3F).
S5M0249A
5) Connect battery ground cable and turn ignition
switch to ON.
6) Check airbag warning light illuminates.
NOTE:
In some cases the airbag warning light will go OFF
after about 7 seconds but will turn ON again within
30 seconds. In this case continue diagnostics with
the basic diagnostics procedures or trouble code
procedures.
:Does airbag warning light go off after
about 7 seconds and remain off for
more than 30 seconds?
: Replace with a new passenger's airbag
module. Go to
step4D6.
: Perform diagnostics and repair accord-
ing to indicated trouble code. 5-5 [T5A0].>4D4 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
1) Turn ignition switch to ªOFFº. Disconnect bat-
tery ground cable, and wait 20 seconds.
2) Connect connector (AB8) to (AB3).
3) Remove driver's airbag module and connect
test harness F connector (1F) to (AB7). 5-5 [W3A1].>
4) Connect airbag resistor to test harness F con-
nector (3F).
S5M0251A
5) Connect battery ground cable and turn ignition
switch to ON.
6) Check airbag warning light illuminates.
NOTE:
In some cases the airbag warning light will go OFF
after about 7 seconds but will turn ON again within
30 seconds. In this case continue diagnostics with
the basic diagnostics procedures or trouble code
procedures.
:Does airbag warning light go off after
about 7 seconds and remain off for
more than 30 seconds?
: Replace with a new driver's airbag mod-
ule. Go to step
4D6.
: Go to step4D5.
13
[T4D4]5-5DIAGNOSTICS
4. Diagnostics Chart for On-board Diagnostic System

4D5 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
1) Turn ignition switch to OFF. Disconnect battery
ground cable, and wait 20 seconds.
2) Remove lower cover panel and connect test
harness F connector (1F) to (AB8) [W1A0].> with airbag resistor attached to test har-
ness F connector (3F).
S5M0250A
3) Connect battery ground cable and turn ignition
switch to ON.
4) Check airbag warning light illuminates.
NOTE:
In some cases the airbag warning light will go OFF
after about 7 seconds but will turn ON again within
30 seconds. In this case continue diagnostics with
the basic diagnostics procedures or trouble code
procedures.
:Does airbag warning light go off after
about 7 seconds and remain off for
more than 30 seconds?
: Replace with a new roll connector. to 5-5 [W800].> Go to step4D6.
: Perform diagnostics and repair accord-
ing to indicated trouble code. 5-5 [T5A0].>4D6 : CHECK AIRBAG WARNING LIGHT
ILLUMINATES.
1) Connect battery ground cable and turn ignition
switch to ON.
2) Check airbag warning light illuminates.
NOTE:
In some cases the airbag warning light will go OFF
after about 7 seconds but will turn ON again within
30 seconds. In this case continue diagnostics with
the basic diagnostics procedures or trouble code
procedures.
:Does airbag warning light go off after
about 7 seconds and remain off for
more than 30 seconds?
: Perform clear memory. [T4C0].>
: Go to step4D1.
14
5-5[T4D5]DIAGNOSTICS
4. Diagnostics Chart for On-board Diagnostic System

Trouble code/
Contents of troublesMemory function Contents of diagnosis Index No.
46 Provided.ISide airbag harness (LH) is faulty.
IAirbag control module is faulty.
51 Provided.ISide airbag sensor (RH) is faulty.
ISide airbag harness (RH) is faulty.
IAirbag control module is faulty.
52 Provided.ISide airbag sensor (LH) is faulty.
ISide airbag harness (LH) is faulty.
IAirbag control module is faulty.
53 Provided. Side airbag sensor (RH) is faulty.
54 Provided. Side airbag sensor (LH) is faulty.
55 Provided. Side airbag module is inflated.
Airbag warning light remains
on.Not provided.IAirbag warning light is faulty.
IAirbag control module to airbag warning light
harness circuit is shorted or open.
IGrounding circuit is faulty.
IAirbag control module is faulty.
I(AB1) and (B31) are not connected properly.
I(AB6) is not connected properly to airbag control
module.
Airbag warning light remains
off.Not provided.IFuse No. 5 (in main fuse box) is blown.
IBody harness circuit is open.
IAirbag warning light is faulty.
IAirbag main harness is faulty.
IAirbag control module is faulty.
Warning light indicates
trouble code, then normal
code. (Flashing trouble
code.)Provided. Airbag system component parts are faulty.
Warning light indicates
trouble code, then normal
code. (Flashing normal
code.)Not provided.IAirbag connector is faulty.
IFuse No. 11 (in joint box) is blown.
IAirbag main harness is faulty.
IAirbag control module is faulty.
IBody harness is faulty.
2. HOW TO READ TROUBLE CODES
The AIRBAG warning light flashes a code corresponding to the faulty parts.
The long segment (1.2 sec on) indicates a ªtenº, and the short segment (0.3 sec on) indicates a ªoneº.
B5M0117A
16
5-5[T5A2]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5E2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure voltage across each test harness I or I2
connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 5 (+) Ð Chassis ground (þ):
S5M0275B
:Is voltage less than 1 V?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
F: TROUBLE CODE 21
DIAGNOSIS:
Airbag control module is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal, and then wait at least
20 seconds.
5F1 : CHECK IF TROUBLE CODE 21 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
21 indicated?
: Replace airbag control module. 5-5 [W6A0].>
: Perform clear memory. [T4C0].>
22
5-5[T5E2]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

G: TROUBLE CODE 22
DIAGNOSIS:
Front airbag module is inflated.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground terminal, and then wait at least
20 seconds.
5G1 : CHECK IF TROUBLE CODE 22 IS
INDICATED.
Confirm flashing trouble code according to ªBASIC
DIAGNOSTICS PROCEDUREº. [T4A0].>
:Is airbag warning light trouble code
22 indicated?
: Replace airbag control module 5-5 [W6A0].>, front sub sensor 5-5 [W9A0].> and front airbag module of
both sides.
: Perform clear memory. [T4C0].>
H: TROUBLE CODE 23
DIAGNOSIS:
(AB6), (AB17) and (AB18) are not connected prop-
erly to airbag control module.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
5H1 : CHECK POOR CONTACT IN CON-
NECTORS (AB6), (AB17) AND (AB18).
Check connectors (AB6), (AB17) and (AB18) con-
nected to airbag control module. [W6A0].>
:Is there poor contact in connectors
(AB6), (AB17) and (AB18)?
: Repair poor contact in connectors
(AB6), (AB17) and (AB18).
: Replace airbag control module. 5-5 [W6A0].>
23
[T5H1]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

M: TROUBLE CODE 41
DIAGNOSIS:
ISide airbag harness (RH) is faulty.
ISide airbag module (RH) is faulty.
IAirbag control module is faulty.
CAUTION:
Before performing diagnostics on airbag
system, turn ignition switch ªOFFº, disconnect
battery ground cable and then wait at least 20
seconds.
5M1 : SIDE AIRBAG MODULE INSPECTION
1) Disconnect connector (AB24) and (AB25), and
then connect connector (AB24) and test harness F
connector (1F).
2) Connect test harness F connector (3F) and air-
bag resistor .
3) Connect battery ground cable and then turn
ignition switch ON.
:Does the airbag warning light go off
after about 7 seconds and remain off
for more than 30 seconds?
: Replace front seat with side airbag mod-
ule (RH).
: Go to step5M2.5M2 : SIDE AIRBAG HARNESS (RH)
INSPECTION
1) Turn ignition switch OFF, disconnect battery
ground cable and then wait at least 20 seconds.
2) Disconnect test harness F and airbag resistor.
3) Disconnect connector (AB18) from airbag con-
trol module and connect test
harness I or I2 connector (1I).
4) Measure resistance between test harness I or
I2 connector (3I) terminal and test harness F con-
nector (3F) terminal.
Connector & terminal
(3I) No. 7 Ð (3F) No. 3:
S5M0341A
:Is the resistance less than 10W?
: Go to step5M3.
: Replace side airbag harness (RH).

37
[T5M2]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code