Eesti BMW Klubi

Nimelt viskab siis autot seisma jättes mul sellise kirja kompuutrisse "REMOTE KEY". Oskab keegi öelda mida see tähendab. Panin ka otsingusse, aga ei leidnud vastavat teemat...

Tänud!

leidsin googlest sellise jutu;

Now lets talk about the remote keys. When used in the remote mode they communicate with the car's security system by radio signals. Now a completely different set of security codes comes into play that relates only to the remoting capabiliites.

Each remote key works with it's own set of security codes, and it does not care what is going on with another remote key.

The remote keys have to go through a separate "initialisation" process. When this is done the car's security unit selects a "code word" for each key ( a randomly chosen number from a base of 2 to the 48th.) This code word is transferred to the remote key and is also remembered by the car for that key. Each key has it's own randomly chosen code word.

Now each time you hit a button on a remote key the code word is incrementd by one number in it's series. So the next time you use that key with the car it is expecting to see the next higher number. Since you might hit a button away from the car it tracks a series of numbers and will resync the key & code if it is within a certain range. If you hit a button often enough away from the car to get outside the expected range, then you will have to hit a button twice before the car will resond - and then put itself back in sync for that key. There is another higher range (1000 strikes) that if you go beyond that the car will not respond and you will have to re-initialise all the remote keys - they then start will new code words again.

So essentially the car keeps track of the "code word series" of numbers for "each remote key".

And that is how they can use the remote keys to trigger "memory functions" for each key.

ja link ise;
http://bimmer.roadfly.com/5series/messa ... 28753.html

kristjan128 kirjutas:Nimelt viskab siis autot seisma jättes mul sellise kirja kompuutrisse "REMOTE KEY". Oskab keegi öelda mida see tähendab. Panin ka otsingusse, aga ei leidnud vastavat teemat...

Tänud!

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