Suzuki GRAND VITARA Owner's Manual page 1277

Step
2 1) With ignition switch OFF, disconnect SDM connector
"L33".
2) Check proper connection to SDM at terminals "L33-1"
and "L33-2" or "L33-3" and "L33-4".
3) If OK, release shorting bar in SDM connector inserting
release tool (1) included in special tool (A).
4) Measure resistance between "L33-1" and "L33-2"
terminals (for DTC B1321) or "L33-3" and "L33-4"
terminals (for DTC B1325) with connected special tool
(B) and (C).
Special tool
(A): 09932–76010
(B): 09932–75010
(C): 09932–78340
"L33-1"
"L33-2"
(A)
Ω
Is resistance 5.5
Action
1, (A)
"L25", "L30"
(C)
"L33-3 " "L33-4"
STEERING WHEEL
or less?
Yes
Substitute a known-
good SDM and recheck.
(B)
I5JB0A820045-01
Air Bag System: 8B-75
No
DTC B1321: Repair
high resistance or open
in "GRY/RED" or "GRY"
wire circuit in floor
harness.
DTC B1325: Repair
high resistance or open
in "BRN/WHT" or "BRN"
wire circuit in floor
harness.