If the windshield wiper motor has stopped working — don't rush to replace it. It's not that bad)
Mine was just seized up. Well then, I take it off and start disassembling

I remove the reducer cover

Everything is intact. But it doesn’t turn. To further disassemble, you need to knock out the shaft with the gear wheel. It holds only due to rust. You can simply tap on it (tightening a nut so as not to damage the thread). And here it comes out

I clean the rust off with sandpaper and generously lubricate with water-repellent grease.

The motor cover is held by two bolts, everything was fine there for me, I just added some more lubrication. If you are going to disassemble — be careful with the brushes' springs. They can shoot out)
In general, I put everything back together and it works. But the wipers don't turn off!)

Turns out I simply lost one of the small washers under the gear wheel, need to pay attention. Put it back in place, all is good) now another part of my car is working