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: 326 of 549 B0073-1A:- Second Row Left Seatbelt Pre tensioner Deployment Control circuit resistance below threshold Overview:- ISO Code B0073-1A Customer Symptom SRS Warning Lamp continuously ON in Instrument Cluster. Fault Effects (On Vehicle) Second Row Left Seat belt Pre tensioner 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 second row left seatbelt pre tensioner is below the threshold value (1.1 Ohm) after 4 seconds of cranking. Normal Operating Condition The minimum threshold Second Row Left Seat belt Pre tensioner Deployment Control circuit is 1.1 Ohm. Probable Trouble Area Related wiring Harness, connector or terminals Second Row Left Seat belt Pre tensioner Airbag ECU Airbag Wiring Harness Healing Condition Minimum threshold resistance for Second Row Left Seat belt Pre tensioner should be 1.1 Ohm. Component Details:- Second Row Left Seatbelt Pre tensioner Module: - It is located at the rear passenger door wheel arch inner panel. 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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