TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

Prepared by: Airbag COC Review Approved by: Sanjeev VM Page: 289 of 648 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 AB12 DTC Troubleshooting Guide Version: 2.0 Date: 21-June-2021 B0001-2B:- Driver Airbag Deployment Control signal cross coupled Overview:- ISO Code B0001-2B 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 signal of the Driver Airbag Deployment Control 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 Driver Airbag deployment Module Airbag Wiring Harness Clock Spring Airbag ECU Healing Condition Cross coupling should be removed & Ignition should be turned OFF & ON. Component Details:- (Refer Annexure 2 for Mounting Location of AB12 Airbag ECU) 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. Troubleshooting:- Annexure 1.5 DTC’s confirmation:- After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. 1. Clear the DTC’s & make sure no DTC’s are present for Airbag system