I have no idea what that switch does.
While searching, I did find this web site.
You can view, probably download owner's manuals and other manuals from 1965 to 2024
Volvo Cars US Owners Manual (custhelp.com)
While searching, I did find this web site.
You can view, probably download owner's manuals and other manuals from 1965 to 2024
Volvo Cars US Owners Manual (custhelp.com)