Biba, you won't find anything about the spoiler in the locking pump, that is controlled by the Body Control Module.

BTW, had a chance to have a quick look at the module you sent me.
It should work fine, it will require :
1. a 2 way momentary switch.
2. 2 wires run from the module ( wherever you should decide to mount it ) to the 2 leads on the spoiler motor.
3. a switched 12v source of at least 15 amps.
4. a good ground.
5. wires to connect the switch to the module.

[ it appears the module is merely 2 relays with an op-amp timer ]

It will work like this :
You hold the switch in one direction, the wing will either go up or down. You can hold the switch as long as you like, the module will cut power at about 10 seconds.

I would recommend mounting the switch so that up on the switch makes the wing go up, and down of course down.

The module will not know the wing position, if it is already up and you hold the switch up, it will supply up current to the motor anyway for either 10 seconds or until you release the switch, whichever occurs first.