I have an '01 - look down at the lower left of the dash (Lower than the steering column...all the way down by the hood release area).
There's a rocker switch there, with a windshield washer icon and wiper icon on the top/bottom....you hit one end to wash the window, the other just turns on a wiper (Somewaht intermitent, not same speed as front wipers...)
I assume you have looked at the rear hatch, and you HAVE a wiper...and a little black nozzle above the hatch for the washer?
If those are missing, loose, etc...that would of course hurt your efforts. (Check fuses, etc...also, incase finding and hitting the rocker doesn't work)
Hope that helps!
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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif