That's possibly an entirely separate system. My car has three systems in the fob:
The manufacturer can decide which one to use for starting the car - in your case perhaps it's normally #2 and only use #3 as a backup.
Theo
Apparently the car manufacturers have just 'realised' that if the fob hasn't moved for a couple of minutes then it can be ignored so the external 'wand amplifiers' used by the crims won't pick anything up.
How long has it take the car companies to discover this useful way of thwarting the crooks (*) ?. Apparently the battery in the fob can now go to sleep a short while after movement ceases.
(*) Like Apple and others they are probably more interested in constantly supplying replacements - so much more profitable.
But they'll work if the fob and car are "within n codes" of each other
One way to break into a car is to capture the owner sending an unlock, block the car from receiving the unlock, then replay the unlock code later, providing the owner hasn't locked/unlocked more than 'n' times since?
Doesn't that raise more questions than it answers? How does the fob detect movement? Once the fob 'goes to sleep', how can it detect movement from that time on? In other words there would have to be some process which continues, in order to detect fresh movement.
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