1999 SUBARU FORESTER Ignition system

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

B: TROUBLE CODE 11
DIAGNOSIS:
IAirbag main harness circuit is open, shorted or
shorted to ground.
IAirbag module harness (Driver) circuit is open,
shorted or shorted to ground.
IRoll connector circuit is open, shorted or shorted
to ground.
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.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).5B1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Remove lower cover panel [W1A0].>, and connect connector (AB8) below
steering column to test harness F connector (1F).
S5M0258A
2) Disconnect connector (AB6) [W6A0].> from airbag control module, and connect
it to test harness I or I2 connector (1I) terminal.
3) Measure resistance between test harness I or
I2 connector (2I) and test harness F connector (3F)
terminals.
Connector & terminal
(2I) No. 1 Ð (3F) No. 3:
S5M0259B
:Is resistance less than 10W?
: Go to step5B2.
: Replace airbag main harness. 5-5 [W4A0].>
17
[T5B1]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

C: TROUBLE CODE 12
DIAGNOSIS:
IAirbag main harness circuit is open, shorted or
shorted to ground.
IAirbag module harness (Passenger) circuit is
open, shorted or shorted to ground.
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.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5C1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Remove glove box.
2) Disconnect connector (AB9) and (AB10) to 5-5 [W3A2].> and connect connector (AB9) to
test harness F connector (1F).
3) Disconnect connector (AB6) [W6A0].> from airbag control module, and connect
it to test harness I or I2 connector (1I) terminal.
4) Measure resistance between test harness I or
I2 connector (2I) and test harness F connector (3F)
terminals.
Connector & terminal
(2I) No. 2 Ð (3F) No. 3:
S5M0262B
:Is resistance less than 10W?
: Go to step5C2.
: Replace airbag main harness. 5-5 [W4A0].>5C2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between test harness I or I2
connector (2I) and test harness F connector (3F)
terminals.
Connector & terminal
(2I) No. 5 Ð (3F) No. 4:
S5M0263B
:Is resistance less than 10W?
: Go to step5C3.
: Replace airbag main harness. 5-5 [W4A0].>
5C3 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Measure resistance between test harness I or
I2 connector (2I) terminal.
Connector & terminal
(2I) No. 2 Ð No. 5:
S5M0252B
:Is resistance more than 10 kW?
: Go to step5C4.
: Replace airbag main harness. 5-5 [W4A0].>
19
[T5C3]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5C4 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Measure resistance between test harness I or
I2 connector (2I) terminals and chassis ground.
Connector & terminal
(2I) No. 2 (+) Ð Chassis ground (þ):
S5M0278B
:Is resistance more than 1 MW?
: Go to step5C5.
: Replace airbag main harness. 5-5 [W4A0].>
5C5 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure resistance between test harness I or I2
connector (2I) terminals and chassis ground.
Connector & terminal
(2I) No. 5 (+) Ð Chassis ground (þ):
S5M0279B
:Is resistance more than 1 MW?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
D: TROUBLE CODE 15
DIAGNOSIS:
IAirbag main harness circuit (Driver) is shorted to
power supply.
IAirbag module harness (Driver) is shorted to
power supply.
IRoll connector is shorted to power supply.
IAirbag 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.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5D1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Connect battery ground cable and turn ignition
switch ªONº (engine off).
3) Measure voltage across each test harness I or
I2 connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 4 (+) Ð Chassis ground (þ):
S5M0280B
:Is voltage less than 1 V?
: Go to step5D2.
: Replace airbag main harness. 5-5 [W4A0].>
20
5-5[T5C4]DIAGNOSTICS
5. Diagnostics Chart with Trouble Code

5D2 : AIRBAG MAIN HARNESS INSPEC-
TION
Measure voltage across each test harness I or I2
connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 1 (+) Ð Chassis ground (þ):
S5M0281B
:Is voltage less than 1 V?
: Replace airbag control module. 5-5 [W6A0].>
: Replace airbag main harness. 5-5 [W4A0].>
E: TROUBLE CODE 16
DIAGNOSIS:
IAirbag main harness circuit (Passenger) is
shorted to power supply.
IAirbag module harness (Passenger) is shorted
to power supply.
IAirbag 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.
After 20 seconds elapse, remove instrument
panel lower cover, and disconnect (AB3) and
(AB8), (AB9) and (AB10).
5E1 : AIRBAG MAIN HARNESS INSPEC-
TION
1) Disconnect connector (AB6) from airbag control
module , and connect it to
test harness I or I2 connector (1I).
2) Connect battery ground cable and turn ignition
switch ªONº (engine off).
3) Measure voltage across each test harness I or
I2 connector (2I) terminal and chassis ground.
Connector & terminal
(2I) No. 2 (+) Ð Chassis ground (þ):
S5M0274B
:Is voltage less than 1 V?
: Go to step5E2.
: Replace airbag main harness. 5-5 [W4A0].>
21
[T5E1]5-5DIAGNOSTICS
5. Diagnostics Chart with Trouble Code