Copyright © TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout the consent of author . SRS / Airbag ECU – DTC Troubleshooting Guide Vers ion: 14.0 Da te: 14-February-2017 Prepared by:Airbag COC Review & Approved by:Sanjeev VM Page: 470 of 549 B0021-1B:- Left Curtain Deployment Control circuit resistance above threshold Overview:- ISO Code B00211B 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 circuit resistance of Left Curtain is above the threshold value (5.5 Ohm) after 4 seconds of cranking. Normal Operating Condition The maximum threshold for Left Curtain Deployment Control circuit is 5.5 Ohm. Probable Trouble Area Related wiring Harness, connector or terminals Left Curtain Module Airbag ECU Airbag Wiring Harness Healing Condition Maximum threshold resistance for Left Curtain should be less than 5.5 Ohm. 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:-
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