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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: 14 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.
B1637-84: Vehicle Immobilizer Control Module Transponder signal below allowable range
Overview:
ISO Code
B1637-84
DTC simple description
Minimum required transponder keys are not learnt during auto
transponder key learning process
Customer Symptom
No impact
Fault Effects (On Vehicle)
No impact
Lamp Status (If Any)
Off
Fault Detection Condition
At ignition On
Normal Operating Condition
Authentication between EMS & Immo is successful
Probable Trouble Area
Immobilizer
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 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:
Immobilizer
Trouble Shooting:-
Step Checks
IF YES
IF NO
1.
Turn ignition ignition on with 2
nd
key, immo will auto learn
the key
Go to next step
2
Replace the immo with new good one
DTC’s confirmation:-
Number of key learn with immo =2 & vehicle will start both the keys.
Circuit Schematic Diagram:
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)
Component Location & Image:-