Loc/Unlock Signal Wire

Installing an aftermarket electric liftgate on a 2014 CX5. Unlike others I have installed this kit does not connect through the OBD connector but rather taps in the wiring harness lock/unlock signal wire at the drivers side B pillar. My question is, how do I identify the correct wire? What is it's color code? Can I use my meter to see what wire is getting 12 volts when the lock/unlock button is pushed? Any thoughts?
 
I'm a little confused, why would the wire be in the B-pillar?

Anyway, I assume you just mean to tie into the power LOCK part of the liftgate (not the power LIFT part). There isn't really a "signal" wire, but lock/unlock voltage wires. See attached the PDFs for the area in question. These are for 2013MY, but should be the same for '14.
 

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