Page 709 of 801
YH4
GRAND
VITARA
12
3
3
1. Driver side air bag
2. Passenger side air bag
3. Seat belt pretensioner
(if equipped)
1-1. SDM
1-1. Sensor
1-2. Voltage converter1-3. Safing sensor
1-4. Micro-controller
1-5. Energy reserve circuit1-6. Ignition driver circuit
1-2. Power source
3. Driver air bag 4. Passenger air bag
5. Seat belt pretensioner (if equipped)
6. Squib circuit
AIR BAG SYSTEM 10B-3
GENERAL DESCRIPTION
With the air bag system which includes air bags for both the driver's
and passenger's sides as well as the seat belt pretensioners (if
equipped), the sag of the seat belt is taken up, the driver air bag (in-
flator) module is deployed from the center of the steering column
and the passenger air bag (inflator) module from the top of the
instrument panel in front of the front passenger seat in occurrence
of a front collision with an impact larger than a certain set value to
supplement protection offered by the driver and front passenger
seat belts.
The air bag system is designed to activate only in severe frontal col-
lisions. It is not designed to activate in rear impacts, side impacts,
rollovers, or minor frontal collisions, since it would offer no protec-
tion in those types of accidents.
Page 711 of 801
YH4
GRAND
VITARA
WIRE HARNESS COLOR
B : Black
B/W : Black/White
Bl : Blue
Bl/B : Blue/Black
Bl/R : Blue/Red
Br : BrownG : Green
Gr : Gray
G/R : Green/Red
Lg : Lightgreen
P : Pink
V : VioletY : Yellow
Y / G : Yellow/Green
Y/R : Yellow/Red
W : White
W/B : White/Black
1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B
4. ªAIR BAGº warning lamp in combination meter
5. ªAIR BAGº fuse in ªAIR BAGº fuse box
6. Connection detection pin
7. To ECM (or PCM), ICM (if equipped) and ABS
controller (if equipped)
8. To data link connector (DLC)
9. ªAIR BAGº monitor coupler
10. SDM
11. Contact coil assembly
12. Driver air bag (inflator) module
13. Driver seat belt pretensioner (if equipped)
14. Passenger air bag (inflator) module
15. Passenger seat belt pretensioner (if equipped)
16. Pretensioner harness (if equipped)
17. Ground for air bag system
TERMINAL
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A13 A11
A12
A14
A15
A16
Passenger air bag (inflator) moduleLow
High
CIRCUIT
Data link connector (DLC)
Low
High
Low
High
Low
High ªAIR BAGº warning lamp
Driver air bag (inflator) module
Diagnosis switch
±±±±±±±±±
Ground
Passenger pretensioner
Driver pretensioner
Ignition switch (power source)±±±±±±±±±
±±±±±±±±±
CONNECTOR ªAº (SDM connector) TERMINAL ARRANGEMENT OF SDM
(VIEWED FROM HARNESS SIDE)
L1
L2Connection detection pin
: Shorting bar
: Air bag harness
ªAº ªHº : Connector
AIR BAG SYSTEM 10B-5
SYSTEM WIRING DIAGRAM
Page 729 of 801
YH4
GRAND
VITARA
1. DLC
2. Scan tool1. ªW/Bº wire terminal
AIR BAG SYSTEM 10B-23
TABLE D ± SDM CANNOT COMMUNICATE THROUGH THE SERIAL DATA CIRCUIT
(Page 2 of 2)
STEPACTIONYESNO
21) Check if communication is possible by
trying communication with other
controller (ECM (or PCM), ICM or ABS
controller).
2) Is it possible to communicate with other
controller?Go to step 3.Repair open in common
section of serial data circuit
(ªW/Bº wire circuit) used by
all controllers or short to
ground or power circuit
which has occurred some-
where in serial data circuit
(ªW/Bº wire circuit).
31) With ignition switch OFF, disconnect
SDM and ªLamp, DLC and Monitor
Coupler Groundº (ªEº) connector.
2) Check proper connection at ªW/Bº wire
terminal for DLC in ªEº connector.
3) If OK, then check resistance between
ªW/Bº wire terminal in ªEº connector and
ªA4º terminal of SDM connector.
4) Is resistance 1 or less?Substitute a known-good
SDM and recheck.Repair high resistance or
open in ªW/Bº wire circuit
(in air bag harness).
Fig. for STEP 1 Fig. for STEP 3
Special Tool
(A): 09932-76010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.