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: 8 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. B1636-31: Vehicle Immobilizer Control Module Communication with transponder No signal Overview: ISO Code B1636-31 DTC simple description Immobilizer communication failed with transponder Customer Symptom Vehicle cannot start Fault Effects (On Vehicle) Vehicle cannot start 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 Immobilizer, transponder 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 is correct or not Trouble Shooting:- Step Checks IF YES IF NO 1. Check the number of keys are learnt with immo =2 Go to next step Learn the transponder key with immobilizer 2 Replace the key with new good one Go to nest step 3. Replace the immobilizer. DTC’s confirmation:- After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. Circuit Schematic Diagram: Please refer the immobilizer circuit schematic 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)
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