What a story...
First, diagram I posted on jan,7 is not the good one, I finally had it from a friend having acces to a garage database which have them all. I'm deeply sorry about that. Proof that we can't trust internet sites...
New wiring diagram matches with all colors and all signals and for the 20pin connector, we could use nissan shop manual M70 connector, page AV-76 to see connexions for the nav radio (2015-2017)before the actual carplay model (2021).
Second, I received my nav radio but I bought the wrong one, they were existing in two generations... I'm waiting for right one but in meantime, I have done all wiring to interface with the old nav radio wich is working well but USB port is not enabled on this model. I need it as I'm using a USB key for music to save excessive cell data consumption...
Third, I waited 3 months for an original 40pins male and female connector to do a clean job and they were conterfeit ones... pins we're not same as original and connector shells pin holes were 20-30mils shorter than originals... definitively too tight for the pins... impossible to insert them...
I finally forget to have them and as 40pins carplay connector uses only 15pins, I bought and installed an old DB15 male -female to intercept those 15 signals used on the 40pins... I did that because 3 signals had to goes from 20pins to 40pins and an another 3 signals has to go from 24pins to 20pins... and I can put carplay back if I sell truck and if buyer prefers to have that bugged carplay...
The only thing not working with nav radio is speed signal, absent with carplay as it use canbus to get speed...
I think nobody use speed to warn driver when they are over speed limits... usable if you pay a bundle to Sat Radio company... look at your manual I'm sure almost nobody knows that...
The other use of speed signal is to rise volume when over 30mph... but I could live without that...
If someone is interested by all info I have, give me your email, I will send you all photos and wiring diagrams..
Louis