My power seats began to act up a month ago. Usual stuff: both seats stop working intermittently, regardless of the door being open etc.
Before taking everything apart, I ordered a few diodes from Digikey as recommended by onehundred80, although in my case I was pretty sure the relay and the diodes were working.
The reason for that, and that's something anyone can troubleshoot, is with the key out of the ignition, playing with the AJAR switch, I could hear the relay click perfectly.

Anyways, I took the relay out, inspected the board it is mounted on, and there, a nice cold solder joint! Of course, it was on the output pin, the one that goes back to the motors when the relay is closed.
Heat and solder it, all done.
Here is a pic of the cold solder joint for the fun of it (pointed out by the tweezer):


And a picture of the relay part number. People are still asking which one it is although many people have written it down many times:




Here's to another issue fixed by myself thanks to this wonderful forum. Thank you onehundred80!

Alex