I pushed the button and nothing comes on. So i end up having to wipe the rear window or turning my heat on sky high in hopes that it will somewhat dry that wetness and allow me to see my rear. So my question is this, i pulled the fuse box inside the car and next to the batter. Nothing that says defogger and defrost on there.. !! What am I missing. And i did try to look online, but most people were talking about the light fr the defrost button not coming on. Mine comes on!! Just not working..
the inside fuse box
the under hood fuse box

Well I just glanced thru the FSM and what I came up with is that there are no fuses for the rear defogger, only a relay which I believe is integrated into the IPDM E/R (box under the hood with relays and fuses).

If the rear defogger relay is in fact integrated into the IPDM E/R box, the relay itself can't be removed.

You would need to replace the entire IPDM E/R unit.

However the relay may not be the issue anyway...

Look at the troubleshooting chart here in the FSM on page 85
http://boredmder.com/FSMs/Nissan/Maxima/2008/GW.pdf

And here for info about the IPDM. Page 17
http://boredmder.com/FSMs/Nissan/Maxima/2008/PG.pdf

Damn!!!! Really??? #sigh