Back in 2005, I installed a shock sensor to the hood latch alarm of my old Infiniti FX35AWD primarily because the alarm in my old FX (like my Model S) only activates when a door, frunk or trunk is forcibly open, not when there is substantial motion detected. With the help of a friend, we figured out where to splice the shock sensor into the hoot latch for the alarm. This means when the alarm was armed, an impact (light or medium) impact would be the same as the hood being forcibly open and would set off the alarm. I've attached my original digram I created back in 2005. The same shock sensor is still available from Amazon: https://www.amazon.com/Directed-Electronics-504D-Double-Stinger/dp/B0009SXOTC/ref=sr_1_1?ie=UTF8&qid=1529612359&sr=8-1&keywords=car+shock+sensor I've attached my original diagram which we created in 2005. Anyone know which wires that belong to the frunk alarm I could tap into to do the same for our Model S? Anyone have the wiring diagrams for the frunk latch alarm?