Rear window washer does not function

Well, yes, it would have to. I will have to crawl under and see if I can spot it. It comes out of the body under the rear hatch on the right side, where a short piece of rubber tubing goes back into the body to the third brake light, so at some point it does go into the body. My concern of course is I am spewing fluid internally where it can cause corrosion?
Thanks for the quick reply! I will post back when I look into it. Likely this weekend.

Fixed:
Nice day Saturday, so I crawled under the truck and tried to follow the line. Looking along and around the passenger side frame rail, I found the hard lines for the rear heater/ac run there, but no rubber hoses. Hmmmm...
-Then I got smart: Thinking that since no fluid shows up on the ground the issue is most likely at one end or the other. I pulled the 3rd brake light off and disconnected the hose to the washer head. Sucking on the hose revealed no open line, (and no fluid) so I hung the hose out disconnected from the head, and ran the rear washer. A few seconds later I got some questionable looking fluid out, so I ran it long enough to know I had purged the line of old fluid. Since I've found heads plugged in other vehicles over the years, I blew through the head but found nothing indicative of a blockage.
I connected and reinstalled the brake light assy and it now works fine. So, no smoking gun, but perhaps some foreign material in the line or contaminated fluid was blocking the spray head orifice. It’s a new vehicle to me, so no idea of its previous care or history.

Thanks for your help HMAC!

I had were the front would work and not the back. We found out that when you open you tailgate there is a tube splicer at the top of the frame were the fluid comes out. Ours got separated, all we had to do was push them back together. The way we found out it was there is I pushed the washer and my spouse watched for fluid and it was running inside the headliner. Good luck.