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: 252 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 – 11: Reverse Gear Selection Switch - Circuit short to Ground or Open Circuit Overview: ISO Code B2503 - 11 Customer Symptom 1. Reverse lamps always off 2. Reverse functionality (rear wipe) affected Fault Effects (On Vehicle) 1. Reverse lamps always OFF 2. Fuse will blow in case of Base BCM Lamp Status (If Any) Always OFF 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 ground or open circuit 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 ground or open circuit 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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