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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: 57 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.
B163A-12: Vehicle immobilizer control module Status Indicator short to Ground or Open Circuit
Overview:
ISO Code
B163A-12
DTC simple Description
Immobilizer Status LED short to battery supply
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
w/h, immo, instrument cluster
Healing Condition
Off
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:
Not applicable
Trouble Shooting:-
Step Checks
IF YES
IF NO
1
Check the continuity between immo pin 5 & instrument
cluster pin 20 any short to supply.
Rectify fault
Go to next step
2
Change the instrument cluster
Go to next step
3
Replace the immobilizer
DTC’s confirmation:-
Before handover to customer, ensure that vehicle will start without any error
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)
8
CAN_L(High-speed)