HELP - Wire Speaker through Rear Door (Yaris)

[freubel2002]

Well, this is an old subject.
But on my Yaris it is actual.
I can not discover how to wire through the pillar of the car.
I know that on the right rear door the wires (red&white) are installed in to the connector in the inner side of the door pillar. On the other side, to the door there are only 2 wires for the door (un)locking. When in the factory the rear doors are assembled i presume that the wires in the doors are assembled. So when they put the door on car i think they put first a connector in the outside of the pillar and then they bold the door on to the chassis.
Is there a way to unconnect and wire my new mounted speakers? I would NOT prefere to drill a hole.

Thanks