Continental Automotive 5NA920791A User Manual
User manual
Immobilizer System
Type 5NA.920.791.A
Keller, I ID S3 AD AE CO Page 1 20.10.2016
Table of contents
1 System overview ........................................................................................................ 3
2 Transponder ............................................................................................................... 4
3 Power supply .............................................................................................................. 5
4 Technical data ............................................................................................................ 5
5 Label Information ........................................................................................................ 7
USA / Kanada: ............................................................................................................ 7
6 Owner Manual ............................................................................................................ 7
Owner Manual Canada .................................................................................................. 7
Owner Manual USA ....................................................................................................... 8
Keller, I ID S3 AD AE CO Page 2 20.10.2016
1 System overview
The module described within this document is used in the following system environment:
VAG Immobilizer System WFS 5a
The VAG Immobilizer System WFS 5a is, among other things, an integral part of all MQB
instrument clusters.
An immobilizer distinguishes between authorized and unauthorized users and thus it prevents the
engine from running unless the correct key (transponder) is present.
The microcircuit inside the key is activated by a small electromagnetic field which induces current
to flow inside the key body, which in turn broadcasts a unique binary code which is read by the
instrument cluster that includes the immobilizer function. When the cluster determines that the
coded key is both current and valid, the ECU activates the fuel-injection sequence.
The immobilizer is an inductive application (Short Range Device), for this reason a radio approval
(homologation) is required.
All requirements refer to the specification “WFS 5a V1.9 Master” of the Volkswagen AG.
Keller, I ID S3 AD AE CO Page 3 20.10.2016
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