tat button is just to change the angle of the mirror by a mere 20 degree up/downward so the reflection by the mirror are reflected 20% up/down ....
it won't do much coz later on you need to turn it back to normal position for better rear view...
it just a adhoc button to use when the cars behind like to flash its twin boobs so much....
err.. at least that wat it does on my old wira....
anyway... when the car behind turn on their highbeam... i just drive real real slow just to piss off and when they got infront of me.... hahaa... its my turn lioa babe......
yonghs... it do turn the wide angle mirror as well... it does on my wide angle mirror... if not u need to get a better replacement mirror lioa....