Dtc B1150 (No. 1150): Air Bag Communication Circuit Malfunction - Suzuki SX4 Service Manual

DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction

Wiring Diagram
[A]
[A]: Junction block connector viewed from harness side
1. SDM
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.
DTC Troubleshooting
Step
1 Air bag communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from junction block and SDM.
3) Check for proper terminal connection to BCM and SDM
connectors.
4) If connections are OK, check air bag communication
circuit for open, short and high resistance.
Is circuit in good condition?
2 Air bag communication circuit check
1) Turn ignition switch to OFF position.
2) Connect connectors to junction block.
3) Turn ignition switch to ON position.
4) Measure voltage between "L313-2" terminal of junction
block connector and vehicle body ground.
Is voltage 4 – 6 V?
2
5V
L313
4 3 2 1 L313-2
Action
Body Electrical Control System:
YEL
L04-37
2. BCM
Possible cause
• Air bag communication circuit open or short
• SDM malfunction
• BCM malfunction
Yes
Go to Step 2.
Substitute a known-
good SDM and recheck.
10B-20
S7RW0AA204010
1
I6RW0CA20008-01
No
Repair circuit.
Substitute a known-
good BCM (included in
junction block) and
recheck.