Suzuki GRAND VITARA Owner's Manual page 1654

10B-18 Body Electrical Control System:
DTC Detecting Condition and Possible Cause
DTC detecting condition
After ignition switch is turned on, abnormal signal is fed
from SDM to BCM.
Flow Test Description
Step 1: Check air bag communication circuit.
Step 2: Check air bag communication circuit.
Step 3: Check air bag communication circuit.
DTC Troubleshooting
Step
1 Check air bag communication circuit
1) Turn ignition switch to OFF position.
2) Disconnect connector from SDM referring to "SDM
Removal and Installation: in Section 8B".
3) Disconnect connector from BCM.
4) Turn ignition switch to ON position.
5) Measure voltage between "G47-22" or "G46-15" terminal
of SDM connector and vehicle body ground.
Is voltage 0 V?
2 Check air bag communication circuit
1) Turn ignition switch to OFF position.
2) Connect connectors to BCM.
3) Turn ignition switch to ON position.
4) Measure voltage between "G30-19" terminal of BCM
connector and vehicle body ground.
Is voltage 4 – 6 V?
3 Check air bag communication circuit
1) Measure voltage between "G47-22" or "G46-15" terminal
of SDM connector and vehicle body ground.
Is voltage 4 – 6 V?
Action
Possible cause
• Air bag communication circuit open or short
• SDM malfunction
• BCM malfunction
Yes
Go to Step 2.
Go to Step 3.
Substitute a known-
good SDM and recheck.
No
Short to power supply in
air bag communication
circuit.
Short to ground in air
bag communication
circuit. If OK, substitute
a known-good BCM and
recheck.
Open or high resistance
in air bag
communication circuit.