Immobilizer –DTC Troubleshooting Data Version: 1.2 Date:03-June-2014 Prepared Author: Sarang K/Mithipati P Review & approved by: R A Rode (ERC-E&E) Page: 12 of 67 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. B1637-57: Vehicle Immobilizer Control Module Transponder invalid incomplete software component Overview: ISO Code B1637-57 DTC simple description Transponder secret key not programmed Customer Symptom Vehicle cannot be started. Fault Effects (On Vehicle) Vehicle cannot be started. Lamp Status (If Any) Immo status lamp On Fault Detection Condition At ignition On Normal Operating Condition Authentication between EMS & Immo is successful Probable Trouble Area Transponder key (E-key) Healing Condition Component Details: Immobilizer system is designed to prevent vehicle theft by electronically disabling the engine starting system. The engine can be started only with vehicle’s original immobilizer ignition key, which has an electronic identification programmed code. Immobilizer unit (ICU) is an add-on part on the ignition switch, fitted on the steering column. The engine can be started only with the vehicle’s original immobilizer ignition key. The electronic key communicates the identification code to ICU when the key is turned to the "Ignition ON" position. Preliminary Checks: Transponder key. Trouble Shooting:- Step Checks IF YES IF NO 1. Replace the transponder key matching to ignition locj 2. Learn the key with immobilizer DTC’s confirmation:- Confirm that there should not be any error in immobilizer. Circuit Schematic Diagram: Please refer immobilizer schematc VICM pin no Pin description 1 Vbatt (KL30) 2 GND 3 CAN_H(High-speed) 4 Ignition (KL15) 5 Status LED 6 Trasport Mode Fuse (10A) 7 Battery Supply (+Vbatt) 8 CAN_L(High-speed)
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