Suzuki GRAND VITARA Owner's Manual page 1286

8B-84 Air Bag System:
Step
2 1) With ignition switch OFF, disconnect special tools (B),
(C) and SDM connector "L33".
2) Release shorting bar in SDM connector inserting release
tool (1) included in special tool (A).
3) Measure voltage between "L33-1" and body ground, and
between "L33-2" and ground (for DTC B1324) or "L33-3"
and body ground, and between "L33-4" and body ground
(for DTC B1328) with connected special tools (B) and
(C).
Special tool
(A): 09932–76010
(B): 09932–75010
(C): 09932–78340
"L25", "L30"
(C)
STEERING WHEEL
With ignition switch ON, is voltage 1 V or less?
Action
"L33-1"
"L33-3" "L33-4"
"L33-2"
(A)
(B)
I5JB0A820048-01
Yes
Substitute a known-
good SDM and recheck.
1, (A)
No
DTC B1324: Repair
short from "GRY/RED"
or "GRY" wire circuit to
power circuit in floor
harness.
DTC B1328: Repair
short from "BRN/WHT"
or "BRN" wire circuit to
power circuit in floor
harness.