User's Manual

Delphi Deutschland GmbH
Controls & Security Electronics
Albert-Einstein-Straße 5
D-51674 Wiehl-Bomig
Phone: [phone] / 971- 0
Fax: [phone] / 72691
User Manual
Page: 2 / 3
Version 01 Date: 2014-03-07
User manual
The transmitter for keyless entry is ready for operation as soon as a 3V battery is placed into the
battery case.
The transmitter for keyless entry consists of an power supply, a transponder coil, a transmitter IC, a
integrated antenna on the printed circuit board and a µC with e. g. the transmit configuration.
There is only one variant of transmitter, considering the frequency and number of buttons.
The signal carrier frequency is 433.92 MHz and the four buttons have following functions: “Open”,
“Close” and “Trunk Open” and “PANIC”
If one of four buttons is activated, the transmitter for keyless entry sends across the integrated
antenna on the printed circuit board a modulated, dependent on the activated button, protocol to the
radio receiver.
Communication between Immobilizer circuit and Key Fob would be established by the transponder
coil. The carrier frequency for the Immobilizer communication is 125 kHz. The Immobilizer transmits
via the transponder coil, which would be activated by inserting the key into the ignition switch (Key In),
an authentication (on the 125 kHz modulated protocol) for the transmitter for keyless entry and is
waiting for a response by a modulation through attenuation of field.