Old key FOB not working, so I bought a replacement chip

[gjakes]

I put the new chip inside the key. Then closed the car door, and started the "adding a new key" process. Putting the key in the ignition, partially turning it forward, bringing the key back to the off position, pressing unlock (upper button), holding it down, then pressing lock (middle button) 3 times. It was wonderful. The car can now be unlocked wirelessly. Great. But now my car won't start. The engine doesn't even try to turn over. No clicking noise. I can only think of this as happening due to an unexpected consequence of adding a key. Some kind of security feature? My car's a 2001 BMW 325i. Has anyone heard of this?

[jclausen]

Ews part of the must have gotten messed up

[gjakes]

Ok, here's an update. I got it starting again. And it was key related. What I had to do to get it starting again was to put the old chip back inside my key. The reason I didn't even try this was because when I tried to replace the battery on the chip I couldn't remove it. It was as good as welded to the metal connector. Not soldered. So, in trying to remove the battery, the connector for the battery was destroyed. There's no way to install a battery on this chip, so I thought it had no way of communicating with the car. But I guess I was wrong. The car only starts with that chip inside my key fob. I'd prefer to have and use the chip that is able to lock/unlock my doors. Can anyone explain how to get there?