Vehicle Platform: Zest, Bolt, Tiago, Tigor, Osprey, Q501, X451, Q502 ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 3.8 Date: 17-10-2022 Author: BCM COC Page: 127 of 1202 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. Trouble Shooting:- Start Connect the diagnostic tool Read DTCs and check whether it s permanent or in history Follow the procedure to diagnose relevant functional DTCs in the PEPS ECU. NO YES Is DTC Permanent? Clear DTC Stop (DTC in history) U1612– 62 – Head Unit Pairing Detection - signal compare failure Check HU ECU Faulty Replace HU ECU Disconnect vehicle battery connection. (Please follow the safety guidelines) Check BCM and HU connectors for CAN terminal back out Are connectors loose? Reconnect connectors firmly YES NO Is CAN Error present? NO YES Clear CAN error Check BCM to HU Authentication Failure Authentication Failure? NO YES Check and give proper authentication key as per requirement from both ECU s
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