Subaru 2009 IMPREZA Service Manual page 2953

SEAT BELT SYSTEM
Step
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.
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.
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:
8 CHECK HARNESS.
Measure the resistance between the seat belt
buckle switch LH and chassis ground.
Connector & terminal
(R107) No. 1 — Chassis ground:
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:
10 CHECK DTC.
Read the DTC using the Subaru Select Monitor.
11 CHECK COMBINATION METER.
Perform self-diagnosis of the combination
meter. <Ref. to IDI-4, SELF-DIAGNOSIS,
INSPECTION, Combination Meter System.>
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.>
Seat Belt Warning System
Check
Do the driver's and passenger's
warning lights flash, and does
the buzzer sound while the
warning lights are flashing?
Does the seat belt SW display
turn ON
the operation?
Is the harness normal?
Is the resistance less than 10 ? Go to step 9.
Is the resistance when the belt
is fastened 1 M or higher, and
less then 10
detached?
Are any body CAN related DTC
detected?
At the start of combination
meter self diagnosis, did the
buzzer sound and the seat belt
warning light illuminate?
Does the seat belt switch dis-
play turn ON
ing to the operation of the seat
belt buckle?
SB-14
Yes
The seat belt warn-
ing system is nor-
mal.
Go to step 10.
OFF according to
Go to step 8.
Replace the body
integrated unit.
when the belt is <Ref. to SL-50,
REMOVAL, Body
Integrated Unit.>
Check the CAN
according to DTC.
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.
Go to step 16.
OFF accord-
No
Go to step 19.
Go to step 7.
Repair or replace
the harness.
Repair or replace
the harness.
Replace the inner
belt assembly LH.
<Ref. to SB-17,
INNER SEAT BELT
ASSEMBLY,
REMOVAL, Front
Seat Belt.>
Go to step 11.
Replace the com-
bination meter.
<Ref. to IDI-16,
REMOVAL, Com-
bination Meter.>
Go to step 13.