I've just taken delivery of a 2006 Alphard.

I can't see any sign of a rear window washer jet. Did they have them fitted?

The ‘jet’ is in the spoiler above the rear window, not easy to access.

I’ve had no rear wash since I bought our Alphy, kinda gave up as I think stripping out campervan conversion panels to see if tube has been nipped is going to be a major chew.

The washer gives an occasional dribble when operated so I think pump is ok.

Good luck

(If you want I could copy you parts diagram that gives you info)

I can see there is a hole in the spoiler to the left of centre. I couldn't see anything in it and when I poked my finger in it, I couldn't feel anything in there either.

Next time I'm in it I will operate the washer and see if any water appears.