IC:7812D-5WK50073
FCC ID:KR55WK50073
IC:7812D-5WK50079
FCC ID:KR55WK50079
Continental Automotive GmbH
2
General System Description
The RF-remote control system is a subsystem of a Body Computer Module
(BCM) for an automotive carline.
It consists out of a tuning free RF- transmitter in the key and the receiver
module, which is directly connected to BCM control unit.
General description RF transmitter
The RF Transmitter is contained within the head of the vehicle key. It contains
a microprocessor controlled RF transmitter for sending commands to the RF
receiver to remotely control certain vehicle functions, including Lock, Unlock,
Trunk, Panic and Remote Start. The RF receiver then sends received
messages to the BCM to activate functions directly or by sending a GMLAN
message.
The RF transmitter also communicates with the immobilizer base station via a
LF inductive link to authorize the vehicle to start. The transmitter contains a
unique ID code and a vehicle password that is used in a mutual
authentication process with the base station. A successful mutual
authentication is required before the vehicle engine is allowed to be started.
The transmitters will have different buttons (2, 3, 4 or 5) and different
frequencies. The 2 and 3 buttons versions are depopulated versions of the 4
button transmitter. The 5 button design is a same layout like the 4 button
transmitter but one micro switch is located at different positions.
The Vehicle Key Electronics shall provide the following functions:
1. Secure GM RF Link - the Vehicle Key Electronics shall provide for a secure
RF data link between customer-carried transmitters and the RF receiver. This
link shall be uniquely keyed to individual physical transmitter units, providing
both fixed and rolling codes.
2. Low Battery Monitoring and Communication - the Vehicle Key Electronics
shall provide the capability of determining that its battery has reached near its
end of useful life.
3. Replaceable battery - the Vehicle Key, including the Key Electronics, shall
support use of a replaceable CR2032 battery, with continued safe operation
after completion of battery replacement by the operator.
