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

Vehicle Platform: Zest, Bolt, Tiago, Tigor, Osprey, Q501, X451, Q502 ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 3.1 Date: 30-11-2019 Author: BCM COC Page: 1052 of 1106 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 - 12: Internal UnLock Switch - Circuit short to Battery Overview: ISO Code B161A - 12 Customer Symptom Doors always locked. Fault Effects (On Vehicle) Doors always locked. Lamp Status (If Any) NA Fault Detection Condition This fault will be logged after the input switch test routine execution. User has to operate the switch manually during routine. If short to battery fault is detected for Internal unlock Switch, then this DTC code will be returned with the routine results. Normal Operating Condition There should not be any fault returned by routine Probable Trouble Area 1. BCM connector wired wrong. 2. Internal Unlock Switch side wiring harness short to battery. 3. BCM ECU fault. 4. Switch damaged or stuck. Healing Condition 1. Ignition OFF  ON 2. Clear DTC Command Component Details: Internal Unlock Switch, BCM connector Functionality: If the Internal Unlock Switch is short to Ground, then the door is in lock state. Preliminary Checks: 1. Check Battery Voltage (12.5 V & above) 2. Check ECU pins for oxidation, bending & damage. Trouble Shooting: