Suzuki 2006 SX4, Service Manual

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10B-17 Body Electrical Control System:
DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction
S6RW0CA204010
Wiring Diagram
DTC Detecting Condition and Possible Cause
Flow Test Description
Step 1: Check air bag communication circuit.
Step 2: Check air bag communication circuit.
DTC Troubleshooting
YEL
5V
L313-2 L04-37
2
1
L313
1 2 4 3
[A]
I6RW0CA20008-01
[A]: Junction block connector viewed from harness side 2. BCM
1. SDM
DTC detecting condition Possible cause
After ignition switch is turned ON, abnormal signal is fed
from SDM to BCM. • Air bag communication circuit open or short
• SDM malfunction
• BCM malfunction
Step Action Yes No
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?
Go to Step 2. Repair circuit.
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?
Substitute a known-
good SDM and recheck. Substitute a known-
good BCM (included in
junction block) and
recheck.