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: 257 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. B2503 – 12: Reverse Gear Selection Switch - Circuit short to Battery Overview: ISO Code B2503 - 12 Customer Symptom Reverse lamps always ON Fault Effects (On Vehicle) 1. Reverse lamps always ON 2. Battery Drain Lamp Status (If Any) Always ON Fault Detection Condition This fault will be logged after the input switch test routine execution. User has to operate the switch manually during routine. If short to battery fault is detected for reverse gear selection switch then this DTC code will be returned with the Routine results. Normal Operating Condition There should not be any fault returned by routine Probable Trouble Area 1. BCM connector Fault 2. Reverse gear switch input Short to battery from Cockpit wiring harness 3. Switch damaged or stuck 4. Gear selection switch side connector fault. 5. BCM ECU fault Healing Condition 1. Ignition OFF ON 2. Clear DTC Command Component Details: Reverse gear selection switch is part of gear selection switch at gear box. If the IGN is ON and user engages the reverse gear, reverse lamps will be turned ON. Preliminary Checks: 1. Check Battery Voltage (12.5 V & above) 2. Check ECU pins for oxidation, bending & damage. Trouble Shooting:-
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