My dash lights, climate control lights, and taillights all went out at the same time. I think I checked all fuses, what could it be?

Here are the fuses. It looks like it is a feature of the Body Control Module, which is normal. Try this

all interior dash lights not working please help!

https://www.nissanclub.com > threads > all-interior-dash...
Apr 22, 2002 - because when the taillight fuse blows, all your corner lights and dash lights stop working, at least on my car that's what happens.
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SOLVED: 04 altima dash lights just went out.Checked the - Fixya

https://www.fixya.com > ... > 2004 Nissan Altima
04 altima dash lights just went out.Checked the fuses but not all because the direction chart does not say which - Nissan 2004 Altima question.

Fuse Box Diagram Nissan Altima (L32; 2007-2013)

https://fuse-box.info > nissan > nissan-altima-l32-2007-...

The fuse box is located behind the cover below and to the left of the steering wheel. The location of the fuses in the passenger compartment: Nissan Altima ( ...

Check for defective fuse for a start. brake lights on different circuit so shouldn't be affected

You will have to remove the dash to get to it. If it were a fuse chances other lights or the climate controls themselves would not work...

seems that taillights and dash lights are on the same circuit, they did that years ago so that if your dash lights went out you knew that you had no taillights, chech the grounds for the taillights, and check for voltage at the socket, from there its a search for broken wires

check the fuses.

Chk. fuse, taillights and dash lights should be on same fuse.

The battery. Get another one from a salvage yard.

In battery junction box or the under hood fuse panel check fuse no 11(15amp),it will be at the center of the fuse box where there is 4 fuse slots but looks like only 3 fuses, if this fuse in good then you will see a relay that is shaped kinda like a cross.This is the parklamp relay which also powers the dash lights.

Put in a radio lately? - you'll probably find that the fuse is blown for the dash lights; and the stereo is wired incorrectly - if no radio - then there is a control module that controls the lighting I think - put in fog lamps either? I'd bet it was either fog lights or radio incorrectly installed, or control unit. You'll find that the dash lights and tail lights are usually connected (on same circuit). Be sure to turn the key "on" and check both sides of all fuses with a test light. If that turns up nothing, then a wiring diagram and some time are required....

check for blown fuse they run off same fuse.