Originally Posted by 
Oztourer
				 
			I gave the key learn function a go tonight on my D3 using a Nanocom. I have one fully working key and remote and a second key that the remote does not work but once I'm in the car will start the ignition. After contacting the guys at Black Box to get some pointers I tried re-learning the key with the inoperable remote. This is where it got interesting.
The key learning feature is in the Tools menu on the Nanocom. You are given several options: Learn New Key, Learn 1 Key, Learn 2 Keys ... up to 4 keys I think. As I only wanted to try and fix one of my keys I selected the Learn 1 Key option. I followed the prompts and all was well. On completion I removed the key to test, tried the remote but no joy with the central locking. I put the key in the ignition and it started :D so I figured I must have an issue on the PCB with the remote. No problem, I'll pull it apart some time to investigate. :confused::confused:
I did however encounter a problem when I went to use the original fully working key. No remote anymore and it wouldn't start the car!!! :eek::eek::eek:. Mild panic set in but then I thought - the Nanocom must have disabled it when I made the selection to learn only 1 key so I started again, this time selecting Learn 2 Keys. I needed to use the key with the broken remote to start the process off as this was the only one still coded to the car. Again, following the prompts, I put the second key in and everything programmed fine :D:D:D.  I'm back to where I first started but at least I know the learning feature works. :) 
Now to either fix the PCB or find a new replacement remote.