ED_Immobilizer(20061013).pdf

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MCC Preliminary specifaction #2

IMMOBILIZER

(SMARTRA 3)

Published by

Chonan Technical Service Training Center

1 Chonan Technical Service Training Center

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ED Immobilizer

Objectives

To know SMARTRA 3 type immobilizer system.

To understand the diagnosis method of Immobilizer system.

To understand defferent thing between SMARTRA and SMARTRA 3

The SMARTRA 3 immobilizer system is applied for ED. SMARTRA 3 type immobilzer system is

almost same as SMARTRA type. Only different thing is information of transponder is stored to

SMARTRA 3 unit. So, this system include SMARTRA neutralize and teaching mode for SMARTRA.

This manual will explain more detail information about SMRATRA 3 immobilizer system.

Chonan Technical Service Training Center 2

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1.

Intorduction

immobilizer irrespective of engine type.

The immobilizer system consists of a transponder inside the key knob, the encoded SMARTRA3 unit

key and the ECM can decode the secret code stored in the SMARTRA3

ncoded messages to the SMARTRA3 via a dedicated communication line and confirms the key with

the SMARTRA3 .

. The ECM communicates the

e

SMARTRA3

Supply

(12V)

Voltage

Conditioning

Voltage

Regulator

CPU

With

EEPROM

Ground

External

Antenna

Mounted

On Lock

Barrel

Transponder

And SCI

Interface

TP

Comms.

SCI

Comms.

SCI

Interface

with

EMS

SMARTRA Block Diagram

All pins are protected against short to supply and ground. It is preferable to have all

MARTRA3 lines directly connected to the ECM to reduce noise interference.

PIN 1 : Antenna coil (+)

P

PIN 3 : Supply (12V)

PIN 4 : Grund

PIN 5 :Antenna coil (-

IN 2 : Communications Line

)

3 Chonan Technical Service Training Center

ED is applied SMARTRA 3 type

/

S

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ED Immobilizer

2.

component

SYSTEM OVERVIEW

The immobilizer system consists of the ECM, the SMARTRA3 and ignition keys with built-in

transponder.

The ECM carries out the check of ignition key by special encryption algorithm with SMARTRA

Transponder.

3 and

the ECM executes the key Authentication after SMARTRA3 authentication.

he Engine can be started in case of the success in SMARTRA3 and key authentication.

The ECM and the SMARTRA3 communicate by dedicated line. During this communication

S

communication either to SMARTRA3 or to other devices (e.g. Hi-scan pro or GDS) on K line by

switching of a multiplexer and specific communication procedures. The multiplexer is a par

H/W.

of ECM and

MARTRA3 the K line of ECM cannot be used for communication. The ECM controls the

t of ECM

The S

w

ignition lock close to the antenna coil for RF transmission and receiving. The RF signal from the

transponder received by the antenna coil is converted into messages for serial communication by the

SMARTRA3 device. And the received messages from the ECM are converted into the RF signal,

which is transmitted, to the transponder by antenna.

The SMATRA3 executes the encryption algorithm and tr

ansmits the encryption result. And

SMARTRA3 is in charge of relaying from ECM to Transponder.

The SMARTRA3 is teached in key Teaching process and stores

in

SMARTRA3 and to neutralize the SMARTRA3. When SMARTRA3 is neutral, old encrypted cod

and informations of transponder are deleted.

New encrypted code can be stored in Neutral SMARTRA3.

e

During the key teaching procedure the transponder will be p

v

the content of transponder can never be modified or changed. The data are a string of 9 bytes defined

Chonan Technical Service Training Center 4

When IGN On,

T

MARTRA3 carries out the communication with the built-in transponder of the ignition key. This

ireless communication runs by RF (Radio frequency of 125 kHz). The SMARTRA3 is mounted at the

the encrypted code in memory

side SMARTRA3. This encrypted code is used in encryption algorithm between ECM and

rogrammed with vehicle specific data. The

ehicle specific data are written into the transponder memory. The write procedure is unique; therefore

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by vehicle manufacturer. The transponder memory is split into two strings called authenticator ( 6

bytes) and key password (3 bytes).

After this programming the transponder memory is locked and the data cannot be read or changed

respectively. The transponder status changes from „virgin“ to „learnt“.

A

the IDE of all transponder is different from each other. The IDE is programmed by the transponder

manufacturer and is a read-only value.

The authenticator and the key password are not transferred from ECM to transponder or vice versa.

Only the results from the encryption algorithm are transferred. It is almost impossible to calculate the

vehicle specific data from the encryption result.

F

manufacturer’s service tester, which is in use at service station. The protocol of communication is

KWP2000 at the K line of ECM.

Low Frequency -

single wire

ECM

synch bi-dir

comms

wireless link

125kHz

a

Transponder

SMARTRA 3

(Com

munica

tions

4800baud

master)

2.1

TRANSPONDER

T

his part details the layout conditi

on for transponder performance.

ASIC

KEY set

DISTANCE

TP(Transponder)

CONDENSER

6mm

COIL

ANGLE

Front

(Anten

na Coil

Central axis

IGN Lock CYLINDER

ECCENTRI

CITY

Direction)

12mm

KEY

ANT coil

D

efinitio

n for component

Structure for TP

5 Chonan Technical Service Training Center

dditionally every transponder includes a unique IDE (Identifier number) of 32 bit. Unique means that

or teaching of keys and special purposes the ECM is connected to the tester device. This can be the

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