The old 3button key fob on my car was pretty badly mangled by the prev owner -- the microswitches for the lock/unlock were damaged. So I ordered and rcv'd a new switchblade.

But, I'd like to have another key as spare (car came only with one). So, I had bought a 3 button key fob from ebay thinking I could swap the top halves. But, dealer said the key could not be reprogrammed.

So, I thought I'll just graft the good microswitches from the ebay fob onto the old fob. That done (I can tell the switches work as the LED comes on) I took the key to the car, inserted into the ignition and pressed the lock to re-sync -- but I get nothing. Car will not even start with this key. I can still start it with the new switchblade, but the repaired fob does not work.

Any thoughts on what's going on here?

TIA
B