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: 1132 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. B161A - 11: Internal Unlock Switch - Circuit Short to Ground START Connect Diagnostic tool and Run Input Test Routine and operate the switches as mentioned in the input switch test routine specification. Is DTC B161A – 11 logged by Routine? Disconnect vehicle battery connection. (Please follow the safety guidelines) Check connection between BCM and Master Actuator lock signal pin Are co nnectors loose? Correct connector fault (Terminals Bend) 1.RemoveBCM Connector. 2.Perform visual check of connectors for pins bent or damaged Is connector faulty? STOP 1. Unlock the vehicle 2. Check continuity between BCM connector pin [C416] Harness side) with Ground [C1-34/C1-47] Continuity Found? 1. Remove Internal Unlock Switch 2. Perform visual check of connectors for pin bend or damaged Reconnect connectors firmly Internal Unlock Switch Faulty? Correct Connector fault (Terminal Bend) NO YES YES NO YES YES YES NO NO NO Check if Internal Unlock Switch input[wiring harness side] is shorted to ground. Correct Internal Unlock Switch side wiring harness (Short to Ground) 1. Unlock and then Lock the vehicle using RKE or internal knob Check if Locking action is successful? Reconnect all connectors firmly YES Correct BCM side wiring harness ( Short to Ground) Continuity Found? YES NO NO Connect battery and other connectors of BCM ECU, if disconnected. BCM ECU Faulty ReplaceBCM ECU
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