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

Prepared by: Airbag COC Review Approved by: Sanjeev VM Page: 470 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 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. 3. Ensure the Airbag Warning Lamp Indication is continuously ON in Instrument Cluster for 3 seconds after Ignition ON 4. Ensure the Airbag Warning Lamp Indication goes OFF after 3 seconds from Ignition ON. Circuit Schematic Diagram:- Schematic shown below for illustration Battery>>>>>Fuse>>>>Relay>>>>>>>Sensor/Actuator>>>>>ECU CHAMBER A Pin No. Pin Name Description 12 CAN_H CAN High 11 CAN_L CAN Low 6 A_GND Common Switch GND 1 V bat Supply Voltage Battery 15 GND Power GND CHAMBER B Pin No. Pin Name Description 3 BLRC Rear middle seat belt buckle switch Please refer Airbag ECU Pin Assignment for more details. Inspection Method: - N.A. + V 12 Battery A15 CAN L Igniti on Switch CAN H A1 A6 - RESTRAINTS CONTROL MODULE A11 A12 Fuse 10A B3 BLRC V bat GND Rear Middle seat Belt Buckle Switch