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: 10 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. B1636-81: Vehicle Immobilizer Control Module Communication with transponder- invalid serial data received. Overview: ISO Code B1636-81 DTC simple description Incorrect transponder key 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 Immobilizer, 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: Check ignition On with correct transponder key . Trouble Shooting:- Step Checks IF YES IF NO 1. Check the number of key learnt with immo =2 Go to next step Use correct transponder key 2 Replace key with new matching to ignition lock, pair with immobilizer Go to next step 3 Replace immobilizer with new good one, pair with EMS DTC’s confirmation:- After the DTC clearing, vehicle should be start & no error in immobilizer. Circuit Schematic Diagram: Refer the immobilizer 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)
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