SB-8
SEAT BELT SYSTEM Seat Belt Warning System
4. Seat Belt Warning System
A: WIRING DIAGRAM
1. LHD MODEL
<Ref. to WI-308, LHD MODEL, WIRING DIAGRAM, Seat Belt Warning System.>
2. RHD MODEL
<Ref. to WI-309, RHD MODEL, WIRING DIAGRAM, Seat Belt Warning System.>
B: INSPECTION
TROUBLE SYMPTOM:
• Seat belt warning light does not come on or go off.
• Buzzer does not beep.
1. DRIVER’S SEAT
Step Check Yes No
1 CHECK BODY INTEGRATED UNIT SYSTEM.
Check DTC of body integrated unit using Sub-
aru Select Monitor. <Ref. to LAN(diag)-14,
OPERATION, Subaru Select Monitor.>
Is DTC displayed? Perform the diag-
nosis according to
DTC.
Go to step 2.
2 CHECK VEHICLE SPEED SIGNAL.
Check DTC of ABS or vehicle dynamics control
(VDC) using Subaru Select Monitor. <Ref. to
ABS(diag)-15, OPERATION, Subaru Select
Monitor.> <Ref. to VDC(diag)-16, OPERA-
TION, Subaru Select Monitor.>
Is DTC displayed? Perform the diag-
nosis according to
DTC
Go to step 3.
3 CHECK BODY INTEGRATED UNIT.
1) Connect the Subaru Select Monitor to data
link connector.
2) Turn the ignition switch to ON (engine
OFF).
3) Turn the Subaru Select Monitor switch to
ON.
4) Read the data of “Driver’s Seat SW input”
using Subaru Select Monitor. <Ref. to
LAN(diag)-14, OPERATION, Subaru Select
Monitor.>
Is the data of “Driver’s Seat
SW input” “OFF”? Go to step 4. Checktheharness
between body inte-
grated unit and
chassis ground.
4 CHECK SEAT BELT WARNING LIGHT.
Read the data of “D-belt warning light O/P”
using Subaru Select Monitor. <Ref. to
LAN(diag)-14, OPERATION, Subaru Select
Monitor.>
Is the data of “D-belt warning
light O/P” “ON”?
Or does the seat belt warning
light on combination meter illu-
minate?
Go to step 5. Checktheharness
between ignition
switch and body
integrated unit.
5 CHECK BODY INTEGRATED UNIT.
1) Insert the tang plate into the driver’s seat
belt buckle.
2) Read the data of “Driver’s Seat SW input”
using Subaru Select Monitor. <Ref. to
LAN(diag)-14, OPERATION, Subaru Select
Monitor.>
Is the data of “Driver’s Seat
SW input” “ON”? Go to step 6. Check the body
integrated unit.
6 CHECK SEAT BELT WARNING LIGHT.
Read the data of “D-belt warning light O/P”
using Subaru Select Monitor. <Ref. to
LAN(diag)-14, OPERATION, Subaru Select
Monitor.>
Is the data of “D-belt warning
light O/P” “OFF”?
Or is theseat belt warning light
on combination meter off?
Go to step 7. Checktheharness
between ignition
switch and body
integrated unit.