Suzuki SX4 Service Manual page 1116

8B-23 Air Bag System:
Troubleshooting
Step
1 "AIR BAG" warning light check
1) Turn ignition switch to ON position.
Does "AIR BAG" warning light come ON steady?
2 Scan tool condition check
1) Make sure that SUZUKI scan tool is as follows.
• Correct PCMCIA card (software) is used.
• There are no deformation and wear for DLC cable
terminals.
• Connection for DLC cable terminals is in good
condition.
Are they OK?
3 Scan tool operation check
1) Check DLC terminal for deformation and wear.
2) If it is in good condition, connect SUZUKI scan tool to
DLC with ignition switch turned OFF.
3) Check if communication is possible by making
communication with other control modules (BCM, ABS
control module, HVAC control module (auto A/C model)
or P/S control module).
Is it possible to communicate with the other control
modules?
4 Serial communication circuit check
1) With ignition switch turned OFF, disconnect SDM
connector "L04" and check for proper connection at
SDM connector terminal.
2) If connections are OK, check that "Serial data circuit" is
as follows.
• Wiring resistance of "Serial data circuit" wire between
DLC and SDM connector is less than 1 Ω.
Is it resistance less than 1
5 SDM power and ground circuit check
1) Check power supply circuit and ground circuit for SDM
referring to "SDM Power Supply and Ground Circuit
Check".
Is check result in good condition?
6 DLC power and ground circuit check
1) Check power supply circuit and ground circuit for DLC as
follows.
• Voltage of "DLC power supply circuit" between DLC
terminal and vehicle body ground is 10 – 14 V with
ignition switch turned ON.
• Wire resistance of each "DLC ground circuit" between
DLC terminal and vehicle body ground is less than
1Ω.
Is check result in good condition?
Action
Ω
?
Yes
Go to ""AIR BAG"
Warning Light Comes
ON Steady".
Go to Step 3.
Go to Step 4.
Go to Step 5.
Substitute a known-
good SDM and recheck.
Go to Step 7.
No
Go to Step 2.
Repair or replace
defective part.
Go to Step 6.
"Serial data circuit" is
open or high resistance.
Repair or replace
defective circuit.
Repair or replace
defective circuit.