Robert Bosch Pty Ltd VIMA01 Benutzerhandbuch

  

 

PROTOCOL SPECIFICATION 

F005VP0801 

ROBERT BOSCH 

(AUSTRALIA) PTY. LTD. 

A.B.N. 48 004 315 628

 

SMARTRA III IMMOBILISER 

Page 8 of 49 

 

 

Issue Number: 

1.0 

Dev No.

 3881 

Valid from: 

14/2/06 

Print Date: 

28 March, 2007 

© THIS DRAWING IS THE EXCLUSIVE PROPERTY OF ROBERT  BOSCH (AUSTRALIA)  PTY. LTD.  WITHOUT THEIR CONSENT IT MAY NOT BE REPRODUCED OR GIVEN TO THIRD PARTIES. 

DEV04205.9/I-1 

 

 
Requirements for the new Smartra: 
•  automobile to be Thatcham Compliant to withstand attack on car for >300secs. 
•  Product required to be backward compatible with existing system. 
 
Current system : 
•  Engine Management System (EMS) ECU can be replaced easily and car can be started <300secs 

with matching transponders. 

•  Smartra is transparent ie. passes messages to and from the EMS and transponder (no memory). 
 

•  To meet new customer requirements the EMS and the Smartra shall be matched together using the 

same Secret Encryption Key (SEK).      

•  The Secret Encryption Key (SEK) is generated and taught to the Smartra and EMS at the OEM end 

of line tester. 

•  The EMS and Smartra will generate the Secret Encryption Key (SEK) from a common 9 byte 

Diagnostic PIN Number (DPN) unique for each car (ie. use 6 bytes from Diagnostic PIN Number 
(DPN)).  See section 3.2.6. 

•  The Secret Encryption Key (SEK) will be used during all communications between the EMS and the 

Smartra to ensure that the EMS and Smartra are matched. 

•  To test if the units are matched: 

o

  The EMS generates a Random Number and passes to the Smartra. 

o

  Smartra encrypts the Random Number using the Secret Encryption Key(SEK) and passes 

back the encrypted value to the EMS. 

o

  EMS encrypts the random number using its Secret Encryption Key(SEK) and then evaluates 

if the Smartra response is the same as the EMS encryption. 

•  Thieves need to replace the EMS, Smartra and Transponder to steal the car.  The Smartra shall be 

placed in a difficult to get to position in the car (increase time to replace). 

 
 

SMARTRA

EMS

Diagnostic 

Tester

Securit y Pin No. t o access t he 

EM S and Smart ra

t ransponder

Single Wire 

Comms

LF interface

Single Wire 

Comms