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: 567 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. B1F12 – 15: Ambient Roof Lights – circuit short to battery or open Overview: ISO Code (DTC Code) B1F12 - 15 Customer Symptom N/A. Fault Effects (On Vehicle) Roof Lamp LEDs lamps are always ON. Lamp Status (If Any) Ambient Roof Lights permanently on till the fault persist. Fault Detection Condition This fault gets logged by BCM when Ambient Roof Lights output is shorted to battery. Normal Operating Condition Ambient Roof Lights should turn ON whenever door is open. Probable Trouble Area 1. BCM connector wired wrong 2. Ambient Roof Lights harness wire shorted to battery. 3. Ambient Roof Lights Node/components damaged. Healing Condition 1. Ignition OFF  ON 2. Clear DTC Command Component Details: User turns ON Ambient Roof Lights, while door is open. Preliminary Checks: 1. Check Battery Voltage (9V-16V) 2. Check ECU pins for oxidation, bending & damage.