4 ms·
With rolling codes, if you (or a toddler) press your remote button too many time while out of range of the car, will the remote and car get out of sync? More th
by mkj 5y ago
With rolling codes, if you (or a toddler) press your remote button too many time while out of range of the car, will the remote and car get out of sync? More than 60 or 255 presses or something like that?
I guess there must be a mechanism for the car to resync somehow?
- dharmab 5y agoThere's a sync procedure using the physical key.
- wallaBBB 5y agodepending on the type of the key - those with passive functions do it usually every time you press the engine start button, while classical key - once you put the key (physical blade) in the lock to start the car.
- avidiax 5y agoPresumably the keyfob transmits a generation number, so the car just needs to see that the keyfob code is e.g. 187 ahead of its number, and then do a trial roll forward. If it matches, it retains the new generation and secret state, and if not, it retains the old.
- londons_explore 5y agoWell just use a 128 bit counter and let it roll by a million if need be.