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: 11 of 549 B0001-1A:- Driver Frontal Stage 1 Deployment Control circuit resistance below threshold Overview:- ISO Code B00011A Customer Symptom SRS Warning Lamp continuously ON in Instrument Cluster Fault Effects (On Vehicle) Driver Airbag 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 Driver Airbag is below the threshold value (1.7 Ohm) after 4 seconds of cranking. Normal Operating Condition The minimum threshold for Driver Frontal Stage 1 Deployment Control circuit is 1.7 Ohm. Probable Trouble Area Related wiring Harness, connector or terminals Driver Airbag Module Clock Spring Airbag ECU Healing Condition Minimum threshold resistance for Driver Airbag including clock spring resistance should be 1.7 Ohm. Component Details:- Clock spring:- It is located between the steering column and steering wheel that conducts electrical signals in an Airbag system to the module, while allowing steering-wheel rotation. This provides electrical continuity in all steering wheel positions. Driver Airbag Module:- It is fitted inside the steering wheel consisting of a flexible fabric envelope or cushion designed to inflate rapidly during an accident. 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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