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: 1117 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. START Connect Diagnostic tool and Run Input Test Routine and operate the switches as mentioned in the input switch test routine specification. Is DTC B1601 - 12 logged by Routine? Disconnect vehicle battery connection. (Please follow the safety guidelines) Check BCM and Bonnet state switch connectors for terminal backout Are connectors loose? 1.Remove BCM Connector. 2.Perform visual check of connectors for pins bent or damaged. Is connector faulty? Check continuity between BCM connector pin [C4-4] Harness side) with battery [C3-2/C3-1] Continuity Found? 1. Remove Other doors switch 2. Check continuity between BCM harness side connector pin [C4-4] and Bonnet State Switch STOP YES NO YES NO Reconnect connectors firmly Correct connector fault (Terminals Bend) YES NO Correct BCM Side wiring harness (Short to Battery) NO YES B1601 - 12: Bonnet State Switch - Circuit short to Battery Perform the visual check of connectors for pin bend or damaged Is connector faulty? Check continuity at Bonnet State Switch [C4-4] with ground [C1-34/C1-47] Continuity found? BCM ECU Faulty Correct connector fault (Terminal Bend) Correct connector fault at Bonnet State Switch mating connector YES NO YES NO Replace BCM ECU Continuity found? YES NO 1. Switch is faulty 2. Replace Bonnet State Switch Check continuity between two terminals of Bonnet State Switch
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