Vehicle Platform: OSPREY ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 1.4 Date: 15 May 2018 Author: Body CoC Page: 791 of 855 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 – 23: Internal Unlock Switch– Signal Stuck Low Overview: ISO Code B161A – 23 Customer Symptom Internal Unlock switch does not operate Fault Effects (On Vehicle) Internal Unlock switch does not operate Lamp Status (If Any) N.A. Fault Detection Condition This fault gets logged by BCM; if signal stuck low condition is detected for Internal Unlock switch. Normal Operating Condition If the vehicle is Internally locked and Internal unlock switch is press then BCM shall immediately unlock the door. Probable Trouble Area 6. BCM connector Fault. 7. Internal Unlock switch input wire Short to ground from cockpit wiring harness. 8. Switch damaged or stuck 9. BCM ECU fault. Healing Condition 3. Ignition OFF ON 4. Clear DTC Command Component Details: Interior lock/Unlock switch is used for central door lock/unlock function. If vehicle is internally locked and user press Internal Unlock switchthen BCM shall operate the central door lock and unlock relays to unlock the door. Preliminary Checks: 3. Check Battery Voltage (12.5 V & above) 4. Check ECU pins for oxidation, bending & damage.
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