reprogram ecm.
I don't know because that is a stupid question!
If it's the factory fit one, using transponder chips in the ignition keys, then for all practical purposes, you can't.
there are certain special bypassers you can buy from special automotive stores.
its under the steering wheel under the plastic cover and also there is one behind the battery under the bonnet on the nearside.
fuse box under the steering colum.