Continental Automotive NISSAN U5A User Manual
SIEMENS VDO Automotive AG AT BE AS AIS LF
FCC ID: KR5Nissan_U5A
User Manual / Functional Description
of the
Siemens
Immobiliser system type Nissan U5A
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SIEMENS VDO Automotive AG AT BE AS AIS LF
FCC ID: KR5Nissan_U5A
Description of the Siemens immobiliser system type Nissan U5A
This equipment is a vehicle anti-theft device to prevent from the unauthorized use of
a motor vehicle. The equipment allows the ignition system to be disabled when the
ignition system is manipulated without using the proper key, such as by direct
connection of power supplying lines or breakdown of the key-cylinder. The system is
a radio frequency apparatus comprising of a transponder integrally incorporated
within the ignition key, a radio frequency module (RFM) with an antenna installed on
the key-cylinder case and a controller (BCM) controlling the operation of the RF
module.
Whenever the ignition key is inserted the key-cylinder and turned to the “ON”
position, the RFM continues to generate a radio frequency carrier operating on
frequency 125kHz powered by the BCM, and bi-directional transmission in half
duplex mode between the BCM and the transponder occurs. The transponder
requires no internal power supply; it derives its power from the magnetic component
of the radio frequency carrier. Data is stored in the transponder and the BCM in its
non-volatile memory (EEPROM). Data is transmitted via radio frequency link by ASKmodulating this carrier. Absorption modulation is used to transmit data from the
transponder to the BCM. The transponder absorbs the magnetic field which hence
modulates the current in the antenna of the RFM.
Upon receiving the start command from the BCM, the energized transponder
transmits its identifier to the BCM. The BCM sends its own password together with a
set of random numbers to the transponder in return. If the received password
matches the password stored in the transponder, the transponder reprogrammed the
data using its own password and the set of random numbers received in accordance
with the pre-determined protocol, data with the pre-calculated data using the
transponder’s password stored in the BCM and same random numbers in turn,
whereupon the matching being verified as s result of the comparison. After the
comparison the BCM sends the result of the comparison to the engine control
module. When coincidence has been verified, the engine control module enables the
engine to be activated, but when the result is negative it will not allow the engine to
be activated.
Whenever the ignition switch is turned from the ON position to the OFF position
during processing, the system is shifted to ignition OFF mode. The BCM causes the
indication lamp on the dashboard to flash when the ignition switch is in the OFF
position or a malfunction of the system occurs. The engine control module sends a
rolling code to the BCM every time the ignition switch is turned from the OFF position
to the ON position in order to watch for an unauthorized replacement or a
manipulation of the controller.
System components:
Type designation funktion manufacturer
284B2 C9911 Body controller module Calsonic Kansei
28590 C9965 Radio frequency module Siemens VDO
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