Automatic rear spoiler question

[TerryT]

Hi,

I am able to raise the rear spoiler by pressing the button near my left foot. What I can't do is lower it by pressing the button beneath the other button. What I have to do is drive the car until it hits 45 or so and then slow down, then the spoiler lowers.

So I have a few questions :
1. Should the spoiler be able to come down by pressing a button ?
2. If yes, what do you think the problem could be ?
3. What speed does the spoiler automatically come up ?
4. What speed does it come down at ?

Thanks
Terry