Wiper Motor

You need to look up a wiring diagram for the make and model of the van and see which wires are which.
Usually there is one normal "run/positive" wire and as you power the other wires they add to the motor power giving the higher speeds.
(they have multiple sets of windings in them, and the more windings you power, the faster the motor turns) so connections of the wires are pretty critical for normal operation.