How to route speaker wire to rear doors?

[DFA]

Well, I finally decided to get some speakers to install on the rear doors of my Yaris (yes, I have a 5-door), which didn't ship with rear speakers from the dealer, so no speaker wire was routed through the doors.
I tried removing the panel below the seatbelt thingy on the pillar on the middle of the car (the one between the front and rear door, on the sides), and routing the wire through the rubber 'hose' through which the power door and window wires go, all good up until then.

Then the defecation hit the oscillation... when I notice the 'hose' is completely sealed from the outside, and the wires that run through it go through a connector that's plugged into it. I can't figure out how else to route wire to my door.

I attached 2 images showing the plug and what I'm talking about, In case I wasn't clear enough...

I need help BADLY. I'll start losing light in about 3 or 4 hours.