As there's no circuit diagram available, that I know of, for the alarm ecu a visual identfication of the componant on the pcb will have to be made, then bridging or removing the componant to isolate depending how it or it's circuit functions. Alouth there are specs on inertia sensors i've never seen a spec on the LR item so who knows other than the manufacture of the ecu or sensor.
By defenition the sensor activates on the inertia in a bump/knock and has a circuit ajusted/designed to meet the needs in a grash situation, but inertia sensors to go faulty and become under or over sensitve and remember the circuit is powered 24/7 so if there's a problem in a normal albeit heavy bump/knock then replacment of the alarm ecu may be best.