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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: 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)