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

Prepared by: Airbag COC Review Approved by: Sanjeev VM Page: 486 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 U3006-18:- Control Module Input Power "A" circuit current below threshold Overview:- ISO Code U3006-18 Customer Symptom SRS Warning Lamp continuously ON in Instrument Cluster. Fault Effects (On Vehicle) Normal behaviour of Airbag ECU is not guaranteed. Lamp Status (If Any) SRS Warning Lamp continuously ON in Instrument Cluster. Fault Detection Condition This fault gets logged if the supply current to Airbag ECU goes below threshold. Normal Operating Condition Supply current to Airbag ECU should be greater than threshold Probable Trouble Area Current < Threshold Value, Related wiring Harness, connector or terminals, Airbag Wiring Harness, Airbag ECU. Healing Condition The Airbag ECU supply current should be in the range not less than threshold and not more than threshold for the DTC to de- mature. Component Details:- (Refer Annexure 2 for Mounting Location of AB12 Airbag ECU) 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. 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 2. Check whether any new DTC’s are getting qualified for repeated cranking.