Subaru Legacy 2004 Service Manual page 3616

SEAT BELT 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
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.>
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.>
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.>
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.>
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.>
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.>
Seat Belt Warning System
Is DTC displayed?
Is DTC displayed?
Is the data of "Driver's Seat
SW input" "OFF"?
Is the data of "D-belt warning
light O/P" "ON"?
Or does the seat belt warning
light on combination meter illu-
minate?
Is the data of "Driver's Seat
SW input" "ON"?
Is the data of "D-belt warning
light O/P" "OFF"?
Or is the seat belt warning light
on combination meter off?
SB-8
Check Yes
Perform the diag-
nosis according to
DTC.
Perform the diag-
nosis according to
DTC
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
No
Go to step 2.
Go to step 3.
Check the harness
between body inte-
grated unit and
chassis ground.
Check the harness
between ignition
switch and body
integrated unit.
Check the body
integrated unit.
Check the harness
between ignition
switch and body
integrated unit.