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: 265 of 548 B0028-1A:- Passenger Side Airbag Deployment Control circuit resistance below threshold Overview:- ISO Code B00281A Customer Symptom SRS Warning Lamp continuously ON in Instrument Cluster Fault Effects (On Vehicle) Firing of "Passenger Side Airbag Deployment Control" 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 circuit resistance of Left Side Airbag is below the threshold value (1.7 Ohm) after 4 seconds of cranking. Normal Operating Condition The minimum threshold for Left Side Airbag Deployment Control circuit is 1.7 Ohm. Probable Trouble Area Related wiring Harness, connector or terminals Left Side Airbag Module Airbag ECU Healing Condition Minimum threshold resistance should be 1.7 Ohm. Component Details:- Left 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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