Help a stoopid newb and tell me what this button does...

[Wschnitz]

And the winner for the most asked question from new e30 owners is.

[bmw325csi]

How many "weird" buttons do we have on our cars though. Everything is straight forward and simple.

[Simon S]

Wondering what - then figuring out what that button does is like an e30 owner's right of passage..

[iwantspeed]

Did it originally have anything printed on it? Every picture I found online shows a blank button.

No it was faded and blank

[lowsodium]

Did it originally have anything printed on it? Every picture I found online shows a blank button.

Answered my own question...

http://www.ultimategarage.com/shop/part.php?products_id=5655

[lowsodium]

When I first bought my e30 I didn't know why that button did and I was messing with everything with the car. When I got home I couldn't roll the windows up. Lol

Did it originally have anything printed on it? Every picture I found online shows a blank button.

[iwantspeed]

When I first bought my e30 I didn't know why that button did and I was messing with everything with the car. When I got home I couldn't roll the windows up. Lol

[InuFaye]

Circuit breaker for windows.

Circuit breaker for mac.

[lowsodium]

Circuit breaker for windows.

Thanks!

if it is a early 4 door then its a sunroof breaker

Its an 87 4 door, manual sunroof.

[brenE30]

if it is a early 4 door then its a sunroof breaker

[slammin.e28]

Circuit breaker for windows.

[lowsodium]

The print on the button has worn away and nothing happens when I push it. Im guessing it has something to do with the radio. The electronic manual I have doesnt say what this is either...

I found this picture on google images, and their button looks worn down too.