Suzuki GRAND VITARA Owner's Manual page 1276

8B-74 Air Bag System:
DTC Troubleshooting
Step
1 1) With ignition switch OFF, disconnect side-air bag
(inflator) module connector under front seat cushion.
2) Check proper connection to left or right side-air bag
(inflator) module at terminals in "L25" or "L30" connector.
3) If OK, then connect special tools (B) and (C) to side-air
bag (inflator) module connector disconnected at the Step
1).
Special tool
(B): 09932–75010
(C): 09932–78340
STEERING WHEEL
4) Check SDM DTC.
With ignition switch ON, is DTC B1321 or B1325 still
indicated?
Action
"L25", "L30"
(C)
(B)
I4RS0A820032-01
Yes
Go to Step 2.
No
Go to Step 3.