Vehicle Platform: Tiago,Tigor & Osprey ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 2.0 Date: 22-10-2018 Author: Parag K Page: 391 of 737 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. B2501- 12: Horn Relay - Circuit short to Battery Overview: ISO Code B2501 - 12 Customer Symptom Horn always OFF Fault Effects (On Vehicle) Horn always OFF Lamp Status (If Any) NA Fault Detection Condition This fault gets logged by BCM when horn relay output is shorted to battery. Normal Operating Condition Mis-lock sound is occurred and all doors are locked when driver door is closed and other door is opened and pressing RKE locks switch. Probable Trouble Area 1. BCM connector wired wrong 2. Cockpit harness wire shorted to battery or open circuit 3. Relay damaged. Healing Condition 1. Ignition OFF ON 2. Clear DTC Command Component Details: Mis-lock sound is occurred and all doors are locked using horn relay when user press RKE lock switch. Horn relay is active low. Preliminary Checks: 1. Check Battery Voltage (12.5 V & above) 2. Check ECU pins for oxidation, bending & damage. Trouble Shooting:-
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