Hella Kessy for Volkswagen ECU, LF-Antennas, UID 5ZA 010 176 00 1 1 Confidential.The contents may only be passed on, used or made known with our express permission. All rights reserved. May 20, 2009 Hella Kessy for Volkswagen Functional Description for Vehicle Application, Hella Carbody Components Standard version Keyless Entry and Start System with 5ZA 010 176 - 00 outside detection outside rear detection inside detection trunk separation appr. 180cm outside detection appr. 180cm Kessy ECU 5ZA 010 176 - 00 3 interior LF antennas 3 exterior LF antennas 2 2 Confidential.The contents may only be passed on, used or made known with our express permission. All rights reserved. May 20, 2009 Hella Kessy for Volkswagen Functional Description of Procedure with 5ZA 010 176 00 Keyless Entry and Start System outside detection outside rear detection inside detection trunk separation appr. 180cm outside detection appr. 180cm Kessy ECU 5ZA 010 176 - 00 3 interior LF antennas 3 exterior LF antennas Start:
A Person with the UID inside of the vehicle is pressing the Start-Stop-Switch. The Start-
Stop-Switch activates the complete Passive Start protocol:
The interior antenna IN2 is transmitting the LF Data and a carrier signal, which can be recognized and judged by quantity (RSSI-
measurement) by the UID. The other two interior antennas IN1 and TRUNK transmit two additional carrier signals sequential. If the magnetic field strength of one of these transmits is high enough (a certain border is reached) then the UID authenticates the system to start the vehicle. If the magnetic field strength of all antenna transmits are too low (the field strength border is not reached, maybe the UID is laying outside or is held 10cm outside the vehicle) the car wont start. 3 3 Confidential.The contents may only be passed on, used or made known with our express permission. All rights reserved. May 20, 2009 Hella Kessy for Volkswagen Functional Description of Procedure with 5ZA 010 176 00 Keyless Entry and Start System outside detection outside rear detection inside detection trunk separation appr. 180cm outside detection appr. 180cm Kessy ECU 5ZA 010 176 - 00 3 interior LF antennas 3 exterior LF antennas Entry:
A Person with the UID nears to the locked vehicle. If he graps the door handle a capacitive unlock sensor is activated and the complete Passive Entry Protocol is started:
The door handle antenna is transmitting LF data and a carrier signal, which can be recognized and judged by quantity (RSSI-
measurement) by the UID. If the magnetic field strength is high enough
(a certain border is reached) the UID stays awake for additional LF communication by the other antennas driven sequentially. The additional LF communication guaranties the functionality, that only the valid key OUTSIDE the vehicle authenticates the system to unlock the car passively. If the magnetic field strength is not high enough (e.g. the UID is too far away from the vehicle, the border is not reached), the UID shuts down again and waits for the next LF Data. The vehicle is still locked. 4 4 Confidential.The contents may only be passed on, used or made known with our express permission. All rights reserved. May 20, 2009 Hella Kessy for Volkswagen Functional Description of Procedure, Hella Devices for Passive Entry and Start Keyless Entry and Start System Electronic Control Unit 5ZA 010 176 00 INTERIOR LF antenna INTERIOR LF antenna INTERIOR LF antenna EXTERIOR LF antenna EXTERIOR LF antenna EXTERIOR LF antenna transmitting frequency f = 125kHz User Identification Device transmitting frequency f = 315MHz or 433MHz Body Control Module NOT in TEST-focus!!!
with integrated RF - Receiver 5 5 Confidential.The contents may only be passed on, used or made known with our express permission. All rights reserved. May 20, 2009