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

Prepared by: Airbag COC Review Approved by: Sanjeev VM Page: 626 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 B100B-2B:- Passenger Deactivation Switch Signal cross coupled Overview:- ISO Code B100B-2B Customer Symptom SRS Warning Lamp continuously ON in Instrument Cluster. Fault Effects (On Vehicle) Passenger Airbag status is not correctly reported on Instrument Cluster and Passenger airbag status is set to default Lamp Status (If Any) SRS Warning Lamp continuously ON in Instrument Cluster. Fault Detection Condition This fault gets logged if the signal 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 Passenger Deactivation Switch Module Airbag Wiring Harness 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) 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. PADI (Passenger Airbag Deactivation Indicator)Passenger Airbag Deactivation Indicator is provided in the Fascia Switch or in SBR display & gives the visual indication to the occupants on the deactivation status of the Passenger Airbag. This indication will glow, if the Passenger Airbag is deactivated. PADS (Passenger Airbag Deactivation Switch)Passenger Airbag Deactivation (PAD) Switch is provided on the left side of dashboard. Passenger Airbag should be deactivated if a child is seated in the Front Passenger seat (Since, in case of an impact, the deployed airbag will hit the child directly on his head with a heavy force, which can be dangerous to the child). Passenger Airbag can be deactivated by turning the PADS switch in anti-clockwise direction using the Ignition Key. It can be re-activated by turning the PADS switch in clockwise direction using the Ignition key. SBR Display :- SBR (Seat Belt Reminder) display gives visual indication to the occupants regarding the Seat belt buckle status of front & rear passengers & also the PAD Switch status. 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:-