Ignition key

Hi, I just bought a new ignition key from a dealer and I was told about a procedure to make it recognize from the car. This precedure doesn't work, Can anybody tell me the correct one? This was 10 min key on, 10 seconds off for three times..
Thank you!

What car???

2002 Ltz trailblazer 4.2 6L awd living in Italy... but this shouldn't matter..

That is a PassLock key....it needs No programming, because it is a blank key.....

If your problem is, you turn the key, and the engine does not turn over, or it turns over, but doesn't start, the problem is not your key....

Agreed. Unless GM did something screwy with export models, or with options I don't know about, the key (or vehicle) don't need "programming" to work.

I have a 2003 LTZ 4.2, had some generic spare keys made. I shove them in the lock cylinder, and the engine starts when the key is turned.

I will go back to the dealer again then... Key costs 57 euro and a spare remote about 200 euro.. not cheap though. By the way I'll let you know. Thanks

I will go back to the dealer again then... Key costs 57 euro
My generic key from an independent locksmith was about six dollars.

Two remotes on Amazon.com, cost about less than 24 euro's....

In the end for this new ignition key I have to get car to a gm dealer, connect it to gm usa, delete immobilizer system, re-program it with new and old Keys. .. 200 euro I was told.. what do you think?

I think your vehicle has a key system that's not used in America.