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

Prepared by: Airbag COC Review Approved by: Sanjeev VM Page: 72 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 U0422-81:- Invalid Data Received From Body Control Module- Invalid serial data received Overview: ISO Code U0422-81 Customer Symptom N.A. Fault Effects (On Vehicle) No effect. Lamp Status (If Any) N.A. Fault Detection Condition Incorrect or implausible reverse gear data received from BCM module by RCM (SRS) ECU. Normal Operating Condition Error free communication between RCM and Body Control Module. Probable Trouble Area Implausible reverse gear data received from BCM ECU Healing Condition Clearing of the functional failures in the BCM 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. Ensure the proper locking of Airbag ECU wiring harness connectors in the vehicle by the locking sound. 2. Check resistance between diagnostic CAN pin number 6 and 14 in OBD connector. It should be 120 ohm. 3. Check for short conditions between CAN_H-CAN_L, CAN_H-GND, CAN_L-GND, CAN_H-Vbat and CAN_LVbat. There should not be any short circuit conditions. 4. Check continuity between IPC CAN_H vehicle side connector to OBD connector CAN_H and CAN_L vehicle side connector to OBD connector CAN_L 5. Read IVN DTCs in IPC in Ignition ON condition. Troubleshooting:-