User's Manual

MARQUARDT GmbH

Schloßstraße 16

D 78 604 Rietheim – Weilheim

First Draft 23.10.2009 Version 1.02

Department APDA1-RI File

Editor U. Schwalm Doc.-No.

Date 25.02.2010 Page Page3 von 10

Vehicle Key BR166 – technical Description

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nicht ausdrücklich zugestanden. Zuwiderhandlungen ver

sondere für den Fall der Patenterteilung oder GM-Eintragung

Comunicado como segredo empresarial. Reservados todos os direitos.

Confidado como secreto industrial. Nos reservamos todos los derechos.

form 659.02

1.2.1 Access permission with keyless entry

The keyless access permission (keyless entry) is initiated by the vehicle user activating the vehicle door

handle. This causes the vehicle to send an inductive wake up message. On receiving this, the key starts in

active mode.

The vehicle now sends further unmodulated, inductive fields which enable the key to ascertain its position in

relation to the vehicle on the basis of field strength measurements.

Bidirectional HF communication follows, in which cryptographically encrypted authentication data is

transferred between the key and the vehicle.

If the key is outside the vehicle, the vehicle is locked or unlocked following transferral of the correct data.

1.2.2 Drive permission with keyless go

In principle, when activating the start/stop button for a keyless engine start, the same process runs as that

described for access permission of the BASIC model. The difference here is that the key must be located

inside the vehicle, but needs not to push into the EZS (electronic ignition switch).

The presence of the key inside the vehicle is verified on every 5km driven, and on driving away. The

process that runs here is similar to the engine start process, although shorter.

The cryptographically encrypted authentication between key and vehicle is accomplished by a bidirectional

RF communication.

1.2.3 LF / HF transferral

The inductive wake-up message is sent in a phase-modulated (PSK) format through the vehicle on the

frequency 21.845 kHz with a data rate of 5.461 kBd.

With respect to bidirectional HF communications, these are processed in a frequency-modulated (FSK)

format, in the ISM band on 433.92 MHz in Europe and 315 MHz in the USA. The rate of data transferral is 10

kBd.

1.2.4 Operating frequencies of HF transferral

1.2.5 1-channel

In 1-channel operation, the mid-frequency of the channel is:

ECE: 433.92 MHz

USA, Japan: 315.00 MHz