Key will not start X5 but locks/unlocks doors remotely

[coffeesnob]

I have a 2001 X5 with two sets of keys. One set works great. The other set will remotely lock/unlock doors but will not start the vehicle.

I have done a search and did follow the initialization procedures when you hold in unlock button while pressing lock button three times. That initialization seems to compete successfully, but the key still will not start the vehicle.

I would think if it was the battery, the doors would not lock/unlock remotely.