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: 457 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. B160A - 12: Door Second Stage UnLock/ Door UnLock control others Relay - Circuit Short to Battery ISO Code B160A - 12 Customer Symptom Other doors will not unlock. Fault Effects (On Vehicle) Other doors will not unlock. Lamp Status (If Any) NA Fault Detection Condition If short to battery fault is detected for Second Stage Unlock Relay, then this DTC code will be returned. Normal Operating Condition Other doors gets unlock while Second Stage Unlock Relay is operating fine on 2nd unlock pressed. Probable Trouble Area 1. BCM connector Fault 2. Harness wire shorted 3. Second Stage Unlock relay damaged 4. BCM ECU fault Healing Condition 1. Ignition OFF ON 2. Clear DTC Command Component Details: Door Relay, BCM connector Functionality: If the Second Stage Unlock Relay is short to Battery or Open Circuit, then the other doors will not unlock. Preliminary Checks: 1. Check Battery Voltage (12.5 V & above) 2. Check ECU pins for oxidation, bending & damage.
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