Today I decided to check out why both power mirrors on the car wouldn't operate down. I had noticed that when the temperature was high, it was probable that the mirror wouldn't work. The "work around" was to "manually push" the mirror and then use the other controls.
Car is 2000 Impala. I took apart a similarly functioning switch 30 years ago. The older switch was larger and beefier.
Because of the "both mirrors didn't work in one direction", I conclude that the swich is probably bad.
It came apart easily, but it didn't assemble easily. I spent about 20min solving the puzzle, then it's cake.
It's actually a cool design. i always like critiquing designs when I take things apart.
Under it's Left,right,up,down switch was a number of 2 remote control like KB contacts. Instead of the carbon, they used a Gold plated plate which touched gold plated contacts on a PC card. I said cool. A grain of wheat bulb was soldered in place and was light-piped to the LEFT/RIGHT select switch and I said cool again.
The LEFT/RIGHT contacts are tiny pieces of copper shim. Not gold plated with a lubercant and it hit gold plated areas on the PC board.
Now I see the problem. Metal fatique, but no real oxidation. I finally figured out how the contacts went together.
So, I rebent the contacts, but instead of using vaseline or other lubercant, I used some of this:
https://www.electro-tech-online.com/custompdfs/2011/07/CL20Spec20Sheet.pdf
Good stuff, but expensive.
so, neat design, cool switch, hopefully improved switch and a nice puzzle to solve.