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: 616 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. B221E - 15: Heated Rear Windscreen Relay - circuit short to battery or open Overview: ISO Code (DTC Code) B221E - 15 Customer Symptom 1. Rear window always heated without input 2. In case of ETC variant CCM LED always OFF on user request. 3. In case of FATC variant CCM LED always OFF on user request. Fault Effects (On Vehicle) 1. Rear de-fogger always off 2. Battery discharge Lamp Status (If Any) NA Fault Detection Condition If engine is running and rear-defogger is requested ON and the rear defogger relay is shorted to battery or open. Normal Operating Condition Rear window will be started heating only on user request. Probable Trouble Area 1. BCM Cockpit Wiring harness faulty 2. BCM connector Fault 3. Infotainment ECU Fault 4. BCM ECU fault Healing Condition 1. Ignition OFF  ON 2. Clear DTC Command Component Details: If engine is running with more than 600 rpm, the Rear Defogger would be started by pressing Rear Defogger switch either on the FACIA switch bank or on FATC control panel. Preliminary Checks: 1. Check Battery Voltage (9V-16V) 2. Check ECU pins for oxidation, bending & damage.