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I?m assuming they taped into the door jamb switch to BCM circuits. All these wires are Driver?s Door: GY/BK (Pin A32-BCM)
Driver?s side rear door: BK/WH (Pin A39-BCM)
Passenger door: L-GN/BK (Pin A38-BCM)
Passenger side rear door: L-BL/BK (Pin A44-BCM)
Rear tailgate: L-BL/BK (this wire splices into rear passenger side door and ends at A44).
All grounds for all the switches are BK/WH

Door ajar switches are those black things in the B and C pillars you see when the doors are open. Just remove the screw and they come out.

The ground of the driver side switches is under the driver seat, passenger side switches is under the passenger seat.

Routing for the wires is hard to tell. However, I would bet the driver?s side switches are routed from the switches to the BCM via the driver side, while the passenger side is routed down the passenger side to the BCM.

If in doubt when attempting to tap into a wire. Use a high-impedance voltmeter to test the circuit as the doors are open closed.