hello to all, i finally find how to put a new code to the keyless system in my '89 maxima 
, is the same for 1989-1994if someone have the same problem here is what to do:
put off the glove box, on the rigth side you can see the module (silver or metal box) of the digital entry sistem. in the metal box are 3 numbre lines, copy the line that star with "s", they are 7 numbers.
in the touch pad module push "ST" and then the 7 numbers, if you doing fine you'll listen a beep sound, when the beep sound start put your new number, you can put a min of 4 number and a max of 7.
NOTE: can't use repeat number like 11,55 or number that are in the same button like 1,2 or 9,0
if the program of the new number was correct you can put off the door locks (9,0 LOCK button), down the front windows and sunroof (5,6 WDW) and open the trunk (1,2 TRNK)
if it's not clear how to do that send me an email to draven822k@hotmail.com, i have the procedure in word
