[f5fstop]

GM will be including them on the European vehicles, as required per law in some European countries.
BCM is located in the right front kick panel area.
I'll also bet they are splicing in at the cluster for the turn signal circuit going to the backup light. Splicing into the wire going into the park bulb, would make the backup light/turn signal also brake lamp.

I made a mistake in my previous message (long night), there are two circuits to the rear taillamp bulbs. The brown wire is the park lamp circuit and lights the rear lights when the lamps are turned On.
The dark blue wires are the turn signal and brake lamp circuits to the rear bulbs. The BCM controls the turn/brake lamp circuits per input from the brake switch/turn signal switch/hazard switch.

The only separate wires for the turn signals go to the turn signal indicators in the cluster. These are the two wires I had to tap into for my signal mirrors to operate as turn signals and not as brake mirrors as well as signal mirrors.

I have not seen the wiring for the new BCM, but was told a new European BCM would be used to control the turn signal and brake lamp circuits.

Could the European assemblies be installed and used...yes. However, a person would have to run two new signal wires from the cluster wires to the amber bulbs for turn signals (no problem, just use two relays to handle the additional amperage to the bulbs in the rear), and run two new wires from the brake lamp circuit to the rear park/brake (red) bulbs, also using a few relays.
This would isolate the BCM from these two circuits. However, it might set a code, since the BCM monitors the park/turn circuit for bulb outage. However, I'm not sure if on the H3, a bulb outage code has been turn on by the programmers; its just that the BCM is capable of holding this code.