It could be a number of things, these are only guesses.

1)First make sure that all your fuses that are needed for the wing are good.

2)The motor could be bad and won't turn. I am curious if on a roadster you can access the motor once you remove the trunk lid liner? If so, maybe it needs to have a gentle tap to see if it works a few more times.

3)Possibly the "down limit" switch in the assembly is stuck closed and won't allow it to go down, making the BCM think it is already down.

4)Defective BCM Body Control Module that relays the message for the wing to go down or up.

5)Defective switch on dash. Switch contacts could be stcuk closed to make the BCM think you want the wing up always. Does the switch feel normal when using it?

James