Keyless entry Q's
 

Ok so my 2001 dodge 1500 didnt come stock with a keyless entry but when i bought it the guy before me or before him must have added one. I didnt get a button and I didnt even know i had a keyless entry until i opened up the dash and looked. My question is how do i return the wiring to stock so i can hook up the new keyless entry and remote start? The one in there is mopar and when unplugged the truck doesnt start so im guessing it has a anti theft feature. All i want to to be able to take out the old aftermarket keyless entry and add my new keyless entry/remote start. can anyone help?