jt2
Eschew Obfuscation
How is this done? I have horrible visions of tearing the interior of the car apart and it not going back together (or, worse, it's now a squeaky, misfitting, half the "snap" connectors have broken mess).
Most of the time you can sneak the wire in under the pillar moulding without removing same. Just pry a small section up enough to fit the wire, stuff it in, repeat. If you do have to pop up a piece to cross the pillar, pry gently along until you can tell where the snap is (assuming you can't see a screw cover), then pop it out. Easy.

