1 is for programming the garage door opener function.
Not sure about the other 2, but the Owners Manual will tell all about them.
See "Related Questions" below for more
the buttons could be for the built in garage door opener... im not familer with that model but they were used at that time
Press the 1 and 3 buttons on the head unit at the same time
firewall 1-----2-----3 4-----5-----6 front of Ford Windstar
On a 1998 Ford Windstar ( 3.0 and 3.8 ) firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
firewall 1-----2-----3 4-----5-----6 front of Ford Windstar
On a Ford Windstar : firewall 1----2----3 4----5----6 front of vehicle > driver
In a 2000 Ford Windstar : ( DOT 3 brake fluid meeting Ford specification ESA-M6C25-A ) according to the Owner Guide
1 - 4 - 2 - 5 - 3 - 6 #1------#2------#3 #4------#5------#6 front of Ford Windstar
The three buttons on a sun visor typically serve different functions: one button is often used for adjusting the visor's angle to block sunlight more effectively, another may control the built-in mirror light for better visibility when using the mirror, and the third button might be linked to features such as Bluetooth or a garage door opener, depending on the vehicle's configuration. These buttons enhance convenience and safety while driving.
it goes slower then a ford windstar
On a 2002 Ford Windstar : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver
On a 2001 Ford Windstar : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver