2.2 RKE Block

RKE functionality provides the means to lock or unlock and even start the vehicle from a long distance with a fob carried by the user. The system consists of an RF receiver in the vehicle and an RF transmitter in the fob. Unlike the immobilizer operation, the RKE operation requires a battery (CR2032 or equivalent) to be inserted in the fob.

The implemented RKE system supports Microchip messaging protocol (AVR411), which consists of a unidirectional UHF link that is secured based on an AES-128 rolling code algorithm. The message contains information that is used to verify the identity and authenticity of the user and the intended action (command code).

Note: RF and UHF are used interchangeably in this document. For more details on the RKE protocol, refer to the AVR411: Secure Rolling Code Algorithm for Wireless Link Application Note.