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SRS / Airbag
ECU – DTC Troubleshooting Guide
Version: 14.0
Date: 14-February-2017
Prepared by:Airbag COC Review &
Approved by:Sanjeev VM
Page: 460 of 549
B0021-2B:- Left Curtain Deployment Control signal cross coupled
Overview:-
ISO Code
B00212B
Customer Symptom
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Effects (On Vehicle)
Left Curtain deployment not guaranteed, if a crash happens
Lamp Status (If Any)
SRS Warning Lamp continuously ON in Instrument Cluster.
Fault Detection Condition
This fault gets logged if the signal of Left Curtain gets cross
coupled with any other Firing loop terminal during Power ON.
Normal Operating Condition
No cross coupling should be present.
Probable Trouble Area
Related wiring Harness, connector or terminals
Left Curtain Module
Airbag Wiring Harness
Airbag ECU
Healing Condition
Cross coupling should be removed & Ignition should be turned
OFF & ON.
Component Details:-
Left Curtain Module
: - In the vehicle, curtain Airbag is folded and installed behind roof headliner on left side of the
vehicle.
Airbag ECU
: - It is fitted in the floor of central console in the car. The Airbag Electronic Control Unit (ECU) controls the
deployment system to allow an appropriate igniting of the Airbags and belt pre-tensioners to restrain the driver and
passengers.
Preliminary Checks:-
1. Check Battery Voltage (12 V & above)
2. Check for any faults in Airbag Warning Lamp indication in Instrument Cluster.
3. Ensure the proper locking of Airbag ECU wiring harness connectors in the vehicle by the locking sound.
Trouble Shooting:-