You are correct my friend,the yellow and white wires are the trigger wires.
I left my parking bulbs in place(didn't want to lose them) and routed the eyes wires out through the
rubber covers at the rear of the bulbs by making a small hole.
If you want to use as drl then you find a ignition on position two(dash lights on,car not started) 12v source(it will be a red and white wire,but check first with multimeter) inside the box
at the top right hand corner of the engine bay and for running the eyes off the sidelights you just tap one of
the trigger wires into the live of one side light.It doesn't matter that you have two side light live wires as
its the relay harness that looks after the eyes not the car.