Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. SRS / Airbag ECU – DTC Troubleshooting Guide Version: 14.0 Date: 14-February-2017 Prepared by:Airbag COC Review & Approved by:Sanjeev VM Page: 307 of 548 B0020-2B:- Driver Side Airbag Deployment Control signal cross coupled Overview:- ISO Code B0028-2B Customer Symptom SRS Warning Lamp continuously ON in Instrument Cluster. Fault Effects (On Vehicle) Firing of Driver Side Airbag is 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 Right Side Airbag 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 Right Side Airbag Module Airbag ECU Healing Condition Cross coupling should be removed & Ignition should be turned OFF & ON. Component Details:- Right Side Airbag Module: - This airbag is located in seat which inflate between the occupant and door. 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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