Is there an ASDS relay on a 2002 Xterra - 2002 Nissan Xterra

There are some ideas in the link.

https://www.google.com/search?q=2002+nissan+xterra+clicking+noise+in+4wd

Starter motor failure?.

Frist is I am assumming the truck does not crank at all? I would check on the pass fron of the car there should be a realy box and if you take off the top and turn it over you will see where it shows you where the starter relay is. you should eb able to jump that relay with out it in and then try to crank the truck. it might just be a bad relay. Get back to me. Cheers.

Check under the hood in the fuse relay box for a blown fuse. They blow sometimes when changing batteries.

Yes, there is fuel pump relay, which is generally located on the passenger side kick panel. But in your case, the fuel pump relay on 2002 model Xterra is indeed located under the dash around the steering wheel, but no you don't need to remove the cover just lay in floor and you can see it, it will slide off a bracket and you can remove and replace it.
Good Luck!

check fuse or fuel pump relay

check the u joints in the front drive shaft

Inside the fuel tank

most likely the fuel pump. First check fuel pump relay, listen for pump coming on when you turn on the switch. If it does, try changing the fuel filter next.

I have been searching for this same answer with little to no luck. It appears that on 2001, it's up above the drivers side brake pedal. However, I could not find it there. The wiring diagram I looked at showed it to be literally in the middle of the wiring harness, (behind the stereo). I have not had the gumption to try and find it, but that's where it appears to be. I love my Xterra, but hate that the company sees fit to put an essential relay well out of reach. There is no earthly reason this relay is not "plug-n-play" right around the fuse panel...Totally stupid...