Car thieves use was called a code grabber, it scans the air waves, ( say if they are parked in a car park) records the frequency played to a lap top. THAT IS THEN SENT TO A MOBILE OR PDA, then played back!
Then biff baff boff, the car does indeed open.
However, newer cars have whats called a roming code (rolling code) that changes every time the handset is used. the next code in the cycle, then ties up that of the remote, with that of the imobillizer ecu. As if a code is scanned, it can`t be reused.
Clever stuff. Oain in the bum for General Motors techs like me though! :-?
