If you have the original key you can look at the end of it where the actual key meets the plastic and you will see 4 engraved numbers that will be the original key code, if you have the manual you can look in it for the key code that you can use to reset the security key code to what every you want.
If you are referring to the code for cutting a new key, it is found by the passenger side door lock on the inside of the door. You have to remove the door panel, and I had to look through o hole in the framing after that in order to see my code on a 94 maxima. It began with an X. . . and was written on a whitish grey plastic piece slightly to the right of the lock.
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