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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)