What make is the vehicle. Most generally they are garage door openers that you can program to do three different functions. Open garage door , open electric gate , turn on inside/outside lights.
The driver side sun visor of a Chevrolet Malibu can be changed by sqeezing the outside of the clip together. The clip will release the visor. Insert the new visor until it clicks into place.
How to remove the sun visor on a 2002 VW passat driver side
To install a sun visor on the driver's side of a 2000 Buick Grand Sport pry the plastic cover off with a flat head screwdriver. Place new visor and put the screws back in by hand.
The Visor is the tint strip at the top of the windshield. Most cars also come with visors above the driver side that block the sun, this is also known as a window visor.
To fix a driver side sun visor in a 1997 Lexus ES300, first, remove the visor by unscrewing the mounting bracket or clip that holds it in place. If the visor is broken, consider replacing it with a new or used one from an auto parts store or online. If it's simply loose, you can tighten the screws or use adhesive to secure any broken parts. Reattach the visor by reversing the removal process, ensuring it functions properly before finishing.
Those can be programmed to operate certain garage door openers.
What about the sun visor...the answer didn't say anything about how to remove and replace the visor
There are three locations under the hood driver side, kickplate on driver and passenger side.
They are most likely garage door openers ( Home link )
I just repaired my sunvisor. You have to buy four new guides for the sun visor. It cost me $75.00 Cdn. from the dealer.You have to remove the sunroof. With it tilted up there are three screws on each side. After the sunroof is off you can jimmy the visor forward to take it out and put on the new guides. I set the visor on and put the guides on in the track on one side in then the other side. It is a tight fit. When you put the sunroof back on make sure the tilt is down to position the glass properly. It took about an hour to do.
Three wire switch on the driver side of the transmission, just above the pan.Three wire switch on the driver side of the transmission, just above the pan.
I had a problem with the driver side sun visor "dripping down" and would not stay up. I took to the dealer and they replaced it for free with a brand new one. My brother in law has the same problem but he rip it off the hinges and tossed it in the back seat!