Rear defroster doesn't work.

The fuse you need is in the fuse box inside the vehicle. It will be behind a trim panel in the end of the dashboard with the vehicle door open. Check fuses 6 and 7. Some features in a vehicle share a fuse. **Note** ALWAYS replace a fuse with one the same colour and Amp rating.
try this website it lists most fuses and which fuse box it is in.
https://knigaproavto.ru/shemy/en/chrysler/neon-chrysler/917-1999-2005-dodge-chrysler-plymouth-neon-fuse-box-diagram.html

if you push on the rear defrost switch and it doesn`t light up then check the fuses with a test light. if the fuse is good then the defrost switch is likely bad.

check fuse get test light see if you are getting power to the lines in the back window

when you put the defrost on does the switch light up or show it is on. check also check the defrost tape on the back glass most times the summer causes it to come off the glass.

did u try looking at the fuses maybe a blown fuse

Yeah, I'd think it would have lines, too, unless some new way of doing it that I'm not aware of. Maybe the rear window was replaced with a window without the defrost option. There should be a small two wire connector coming out of the back shelf near lower driver's side of rear window. That would be the defrost connector to the window lines (that aren't there,lol).
Well, good luck with that! I think there are aftermarket kits for rear window defrost, though.

check the fuses and there maybe a relay also.

Where is relay and fuse for rear window defrost

should be a 30 amp in the box under the hood shows number 8 on legend a 30 amp fuse

ok dude.... simpe questioneasy answer is 10. in the position#EIGHT