[Binary420]

Sorry, my previous post was a bit jumbled.

What I meant was, once you program a new key using a professional immobilizer / programmer tool, via the "key learning" menu, and it finishes successfully saying "now try to start car".

Once that is finished, and key can start the engine, should the remote fob / CA work immediately / automatically as well? Or is there an additional step to make that work after making the engine startup work?

And 1 more question,

If you were to perform key learning (adding a new key) while there is no battery / dead battery inside the key,
would that possibly have an impact on the remote part of the key still not working even after replacing the dead battery?


That may potentially be my issue. because I can't be sure whether or not the battery was dead in the key or not..

I never tested them, but after programing the key, and seeing that it started the engine, but didnt have any remote functionality, I thought maybe the batteries were dead so I replaced them with new definitely good batteries, and still got no remote response from the keys.

But yet they still start the engine just fine.

So maybe the battery was dead during the initial programming of the key? I assume since the remote functions dont work with a dead fob battery, maybe the programming of the fob part doesnt work either with the dead fob.

I had assumed that it wasnt gonna be an issue. I figured even if the initial batteries were dead, surely once replaced, the car would resync it to the car as soon as i put it into the slot and started the engine.

does anyone know how the cas3+ works well enough to explain whether or not programming a new key while the battery inside the key is dead would cause the remote lock / unlock to never work even after replacing the battery inside?
And if that is in fact the case, and since you can only "marry" a new virgin key 1 time,
then what are my options as far as making that key fully functional.

If I initially programmed it as a smart key (which it is so long as smart key means CA key..) but during key programming, the battery was dead in the key, would that key then be useless, or his there any way to "re sync" the remote portion of the key?

Is that what the Sync DME / CAS option I mentioned before does, or otherwise what is the procedure to re-learn a key which has already been devirginized and is able to start the car but fails to lock / unlock remotely