I'm going to repost it here to spread this solution a little more
Ok, so here I have the solution (hopefully final solution) to anyone looking to add a keyfob to their versas.
First of all, this solution works IF:
1) You checked under your glovebox and you in fact have the keyless receiver (part 28595X, should be the same in all versas) and BCM (you should have this anyway...part number 284B1/2-9EG0A)
2) You can't get the car to go into programming mode, no matter how hard you try...
Your solution is go to the dealership and have them manually change the entry for the Keyless Entry in the BCM, using the CONSULT III tool. This is confirmed and you can check the specs here, at BL-68
and here at BCS-18
Your car initial configuration, BEFORE changing the entry should look like this, first row you can see the KEYLESS ENTRY is set to WITHOUT:
AFTER changing the entry using the CONSULT III tool, your configuration should look like this, first row you can see the KEYLESS ENTRY is set to WITH:
Dealership will likely charge you to hook the car up to the computer (mine was 70ish $) BUT I think it's worth it since your car is already set up to pair with a keyfob, and I would say it's better to use the OEM configuration rather than installing an aftermarket kit from China (where you pay for the kit, you may need assistance and you don't how exactly how reliable it might be).
This is my opinion only, it's up to you but I'd go always go with OEM if the car is already good for it.
After these steps are performed you are good to go and you only need to do the procedure...you know...close doors, lock it from the inside etc etc
I bought a three buttons keyfob
from eBay...works like a charm.