Subaru 2009 IMPREZA, Service Manual

Page: 2953 / 3619

SB-14
Seat Belt Warning System
SEAT BELT SYSTEM
5 CHECK FUNCTION.
1) Wait until the buzzer sound stops in step 3.
(Approximately 6 seconds from starting to
sound)
2) Start the engine, and set the vehicle speed
to 15 km/h (9 MPH) or faster.
3) Check the driver’s and passenger’s seat belt
warning lights, and sounding of the alarm
buzzer.
Do the driver’s and passenger’s
warning lights flash, and does
the buzzer sound while the
warning lights are flashing? The seat belt warn-
ing system is nor-
mal. Go to step 19 .
6 CHECK CURRENT DATA.
1) Select “Current Data Display” and read the
data of the driver’s seat belt switch.
2) Fasten and detach the seat belt buckle.
Does the seat belt SW display
turn ON
mo
OFF according to
the operation?
Go to step 10 . Go to step 7 .
7 CHECK HARNESS.
1) Disconnect the negative terminal from the
battery, and wait for 20 seconds or more.
2) Disconnect the connectors of the body inte-
grated unit and the seat belt buckle switch.
3) Check for a short circuit to battery, open cir-
cuit and short circuit to ground between the
body integrated unit and the seat belt buckle
switch LH.
Connector & terminal
(B281) No. 16 — (R107) No. 3:
Is the harness normal? Go to step 8 . Repair or replace
the harness.
8 CHECK HARNESS.
Measure the resistance between the seat belt
buckle switch LH and chassis ground.
Connector & terminal
(R107) No. 1 — Chassis ground:
Is the resistance less than 10
:
? Go to step 9 . Repair or replace
the harness.
9 CHECK SEAT BELT BUCKLE SWITCH LH.
Measure the resistance between the connector
terminals of the driver’s seat belt switch when
the driver’s seat belt is fastened and detached.
Connector & terminal
(R107) No. 1 — (R107) No. 3:
Is the resistance when the belt
is fastened 1 M
:
or higher, and
less then 10
:
when the belt is
detached?
Replace the body
integrated unit.
<Ref. to SL-50,
REMOVAL, Body
Integrated Unit.> Replace the inner
belt assembly LH.
<Ref. to SB-17,
INNER SEAT BELT
ASSEMBLY,
REMOVAL, Front
Seat Belt.>
10 CHECK DTC.
Read the DTC using the Subaru Select Monitor.
Are any body CAN related DTC
detected? Check the CAN
according to DTC. Go to step 11 .
11 CHECK COMBINATION METER.
Perform self-diagnosis of the combination
meter. <Ref. to IDI-4, SELF-DIAGNOSIS,
INSPECTION, Combination Meter System.>
At the start of combination
meter self diagnosis, did the
buzzer sound and the seat belt
warning light illuminate? Replace the body
integrated unit or
the combination
meter. Or, replace
both. There may
be a communica-
tion malfunction of
the body integrated
unit, or a reception
malfunction of the
combination meter. Replace the com-
bination meter.
<Ref. to IDI-16,
REMOVAL, Com-
bination Meter.>
12 CHECK CURRENT DATA.
1) Sit in the passenger’s seat.
2) Select “Current Data Display” and display
the data of “P seatbelt SW input”.
3) Fasten and detach the passenger’s side
seat belt buckle, and read the data of the seat
belt switch. <Ref. to LAN(diag)-33, OPERA-
TION, Read Current Data.>
Does the seat belt switch dis-
play turn ON
mo
OFF accord-
ing to the operation of the seat
belt buckle?
Go to step 16 . Go to step 13 .
Step Check Yes No