'04 Infiniti FX35 back driver side window does not open or close.

Question edited for clarity. Your vehicle is not an 'infinite. it is an 'Infiniti, and it is an 'FX35', not and 'FX3', plus it is 'YouTube', not Tube'. If you can spell it you can find it :>D

YouTube is for videos, not for finding fuse box data. The Radio is listed as 'Audio' and has 2 fuses. BUT, did you disconnect the battery recently? It the 'radio' asking for the code?

Infiniti FX35/FX45 (S50; 2003-2008) fuses and relays

Fuse-Box.info https://fuse-box.info > infiniti > infiniti-fx35-fx45-s50...

The fuse box is located behind the cover under the instrument panel. The location of the fuses in the passenger compartment: Infiniti FX35/FX45 (2003 ...

Infiniti FX35/FX45 (S50; 2003-2008) fuses and relays

Infiniti FX Forum https://www.infinitifx.org > attachments > 0-20... PDF
Infiniti FX35/FX45 (S50; 2003-2008) fuses and relays. Driver's Side Panel Fuse Box. Assignment of fuses in the instrument panel ... Fuse Box #1 Diagram ...

Infiniti FX35 2004 Interior Fuse Box/Block Circuit Breaker ...

CarFuseBox https://www.carfusebox.com > infiniti-fx35-2004-inter...

Jan 30, 2023 - Infiniti FX35 2004 Interior Fuse Box/Block Circuit Breaker Diagram ; -, Fuse Block ; -, Smart Entrance Control Unit ; -, Engine Control Module (ECM).

The two main reasons are here.

https://www.google.com/search?q=2006+FX35+Infiniti.+The+Speedometer+quit+working

The most common reasons an INFINITI FX35 speedometer isn't working are the vehicle speed sensor (VSS), a faulty speedometer, or an electrical issue.

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Go to the following website and enter your vehicles VIN number. The website will let you know ANY recalls for your specific vehicle. You can get your VIN from your insurance card or by looking through the front window on the driver's side dash.
https://www.nhtsa.gov/recalls?gclid=EAIaIQobChMI9vTnhcyv1wIVBXZeCh3o9A7YEAAYAiAAEgItMfD_BwE

You need to make sure the battery is good. If you see moisture spots around the battery, it may be leaking. Did you leave a light on? Were the lights inside and out dimming before this happened?

defective button/relay

under the pass side seat

Well first of, what are you looking for the AIT?

But anyways, the AIT should be in the MAF Sensor. Hence all the wires.
OK so i havent taken apart a MAF sensor and neither should you, its a pricey item.

But I do know this; An AIT is an NTC sensor meaning that when tempurature goes resistance goes down and when resistance goes down Voltage goes up. Now one thing you can do is find a wiring diagram of the maf sensor and the vehicles computer. And on there it will show you which wire goes to the AIT.

Any Other question? Just ask me.

the solenoid on that door is either shot or something wrong with the wiring..possible it has a fuse for each door but doubtful

Check the battery to the smart key. Sometimes its as easy as that.