I installed a Flash2pass garage door opener transmitter on my wife's new G310R yesterday. Opening the garage door is now a simple matter of two pulls on the high beam flash switch. No remote to keep track of and feed batteries.
I'm leaving this here for people searching for tips on this install, hoping it might save you the exploratory work I did before finding this method.
It actually turned out to be about the easiest install I've done.
There were a pair of screws just behind the front turn signals. One holds the signal stalk on, and the further back one secures the nose cover. I removed the nose cover screws from both sides, and was able to pull up gently on the plastic just in front of the top of the display to release a couple of tabs. That allowed the nose cover (with headlight) to swing down.
On each side is a wire for the turn signals with a connector. Those wires keep the nose from being able to swing all the way down. I disconnected them to allow more room to work.
I pulled up the rubber boot around the headlight and folded it back. I unplugged the connector from the headlight and used a volt meter to identify ground and high-beam. If you don't have a meter or test light and want to check, you can use some wire to check which terminal is which.
I found that the left and right terminals were ground and high beam (which is which doesn't matter as the Flash2pass unit doesn't care). There wasn't much room to use taps on the wires themselves, so I got creative and threaded the Flash2pass wires through the holes in the lugs on the light, making sure the insulation was down low enough to not interfere with the plug. When I plugged the light back in, the wires were clamped by the plug.
There is a near perfect little slot just under/in front of the display where the Flash2pass module tucked in.
A quick test, pull the boot back into position, making sure to leave good slack in the wiring, reconnect the turn signals, close the nose, replace the 2 screws, and done.
Sorry for lack of pictures.