At least for my flap motor (received Jul 2024), applying +12V DC to the blue wire (and GND to the brown wire) will extend the flaps, and doing the opposite will retract the flaps. Note that those are the two larger-sized wires.
The three smaller wires are for the position sensors -- it needs +5V DC to the yellow, GND to the white wire, and the red wire outputs the voltage that indicates the position of the flap motor.