Continental Automotive KESSY User Manual
FCC ID: KR5KESSY
Functional Description /
User Manual
for
SIEMENS
Keyless access control system and
immobilizer
Type KESSY
File: S\Postzula\VW\Kessy\Usa_Canada\funktionsbeschreibung_e Page 1
FCC ID: KR5KESSY
1. Functional Description - Keyless access control system and
immobilizer, type KESSY
1.1. General functional description
The keyless access control system, type Kessy, enables convenient utilization of the
vehicle. To use the vehicle, the driver only needs to take the key along with him/her.
The vehicle communicates with the system inductively via antennas. These antennas
are located in the outside door handles, in the rear bumper, in the gearshift - lever
housing , in the center console, in the central rear arm rest and in the backlite shelf.
These antennas are driven inductively with a frequency of 125 kHz. The system's
range is limited in a defined fashion by damping the body sheet metal. In the vehicle
interior, the ranges of the various antennas overlap, which enables location of the
key.
1.2. Keyless access control (maximum assembly variant M-Option)
The handle of the driver's door and the boot lid are equipped with contacts to ensure
the locking and unlocking functions. If the door handle of a locked vehicle is pulled,
the control unit activates the antennas on the vehicle's side where the handle has
been pulled. These antennas generate an inductive field of 125 kHz which enable
identification of the transponder located in the key. In case of successful evaluation
by the KESSY control unit and with the outside door handle actuated, the command
"Open door" is issued, i.e. the door opening assistant and the central locking system
are activated.
If the "locking button" is pushed while the vehicle is unlocked, the identification process is started, i.e. the KESSY control unit starts a request for a valid key. The key
returns a corresponding response to the KESSY control unit. If the key has been activated successfully by the KESSY control unit, the central locking system is activated
and the vehicle is locked.
File: S\Postzula\VW\Kessy\Usa_Canada\funktionsbeschreibung_e Page 2
FCC ID: KR5KESSY
1.3. Keyless start/stop (maximum assembly variant M-Option)
The system provides the function which enables starting/stopping the engine without
key actuation.
The prerequisite for starting the vehicle is a key allocated to the vehicle, which is
taken along by the user and is clearly inside the vehicle. By actuating the starting device, the driver starts the identification process, i.e. the KESSY control unit issues a
request for a valid key inside the vehicle. The key returns an appropriate response to
the KESSY control unit. In case of successful identification of the key, the vehicle is
started and the immobilizer is deactivated.
Block diagram Fig. 1
-
inductive range of action of
outside door handle antennas
-
range of action of center console /
rear arm rest antennas
-
inductive range of action of an-
tenna in backlite shelf
-
inductive range of action of
bumper antenna
- inductive antennas
- key
- radio receiver in control unit
- range of radio action
indukt. Wirkungsbereich Türgriffant ennen
Prinzipdarstellung Fig. 1
File: S\Postzula\VW\Kessy\Usa_Canada\funktionsbeschreibung_e Page 3
indukt. Wirkun gsbereich Innenraumant e nnen
indukt. Wirkungsbereich Hutablageantennne
indukt. Wirkun gsbereich Stoßfängerantenne
induktive Antennen
Funksender
Funkempf än ge r im Steuergerät
Funk Wirkungsbereich
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