5
It's a 4 pin connector. It goes here
I found a picture online of all the cables and connectors I (most probably) need, here:
From this picture (from left to right): I know the part number for the first one and the last two. The first one goesinto the control unit, the sixth (black) connector goes to the DC motor of the spoiler. The third is probably ground, but I don't know what the second, fourth and the fifth (adapter) are for.
If it helps, i got some pics here:
I don't have a pic of the other side of the last connector. :/