Subaru 2009 IMPREZA, Service Manual

Page: 2952 / 3619

SB-13
Seat Belt Warning System
SEAT BELT SYSTEM
4. Seat Belt Warning System
A: WIRING DIAGRAM
<Ref. to WI-97, WIRING DIAGRAM, Seat Belt Warning System.>
B: INSPECTION
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground terminal from battery, and wait 20 seconds or more before starting to work.
• When replacing the airbag module, seat belt pretensioner, roll connector, control module and sen-
sor, reconnect each part and check that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the airbag module connectors of the driver’s
and passenger’s seats for safety.
• When inspecting the airbag rear harness, disconnect the side airbag module connector, curtain
airbag module connector and seat belt pretensioner connector for safety reasons.
TROUBLE SYMPTOM:
• Driver’s side seat belt warning light does not illuminate or it remains illuminating.
• Warning buzzer does not beep.
Step Check Yes No
1 CHECK CURRENT SETTINGS.
1) Prepare the Subaru Select Monitor.
2) Turn the ignition switch to ON (engine OFF),
and run the “PC application for Subaru Select
Monitor”.
3) Select “Current Data Display” and read the
data of “Belt Warning Switch”.
Is the belt warning display ON? Go to step 2 . Turn the belt warn-
ing ON with unit
customizing.
2 CHECK CURRENT DATA.
1) Select “Current Data Display” and read the
data of “IG power supply voltage”.
2) Turn the ignition switch ON
mo
OFF.
Does the voltage change
between 10 V or higher
mo
less than 1.5 V, matching the
ignition switch ON
mo
OFF
operation?
Go to step 3 . Check the ignition
switch circuit.
3 CHECK FUNCTION.
1) Sit in the driver’s seat and passenger’s seat,
and disconnect the seat belts of both seats.
2) Turn the ignition switch to ON (engine OFF).
3) Check the illumination of the driver’s seat
belt warning light in the combination meter and
the passenger’s seat belt warning light in the
clock unit, and the sounding of the buzzer.
Do the driver’s and passenger’s
warning lights flash, and does
the buzzer sound while the
warning lights are flashing? Go to step 4 . • Malfunction of
the driver’s seat
belt warning light
o
Go to step 10 .
• Malfunction of
the passenger’s
seat belt warning
light
o
Go to step
16 .
• The buzzer does
not sound.
o
Go to
step 6 .
4 CHECK FUNCTION.
1) Wait until the buzzer sound stops in step 3.
(Approximately 6 seconds from starting to
sound)
2) Fasten and detach the driver’s and passen-
ger’s seat belts.
3) Check the illumination of the driver’s seat
belt warning light in the combination meter, and
the passenger’s seat belt warning light in the
clock unit, and the sounding of the buzzer.
Does each seat belt warning
light illuminate
mo
turn off
according to the action?
Go to step 5 . • Malfunction of
the driver’s seat
belt warning light
o
Go to step 6 .
• Malfunction of
the passenger’s
seat belt warning
light
o
Go to step
12 .