How can i change the code on my home security system?

My wife an i are buying a house and just moved in. It has a security system in it.we dont have the numbers for the old code and the screen is all busted up. We dont want to have it monitored just to use for the siren and safety of it. If we just buy a new key pad will it let us reset the numbers or are the... show more My wife an i are buying a house and just moved in. It has a security system in it.we dont have the numbers for the old code and the screen is all busted up. We dont want to have it monitored just to use for the siren and safety of it. If we just buy a new key pad will it let us reset the numbers or are the numbers stored in the box in the closet?
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