Thanks cimarron but to have a complete manual one file is missing... In the bt.pdf file (body and trim) there is a reference to a Body Repair Manual (brm.pdf) does someone knows the link to this file...

[Edited, I have found the link]
https://www.nissan-techinfo.com/nissan/pdfs/sm/2003/xterra/brm.pdf

It's in the 2003 folder but it's applicable to 2000 and up.