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Message: <blockquote data-quote="Schwepps" data-source="post: 355154" data-attributes="member: 3592">Not really a noob question buddy. :wink: The safety system of a car comprises many components, all of which act together, not individually. An ACU (ECU module) monitors accelerometers, impact sensors, pressure sensors, wheel speed sensors, gyroscopes, brake pressure sensors, and seat occupancy sensors to determine the area, angle and severity of a crash or roll-over. Various systems are then deployed when the ACU decides (in milliseconds): airbags, seat-belt pretensioners, seat back and head restraint pretensioners, pedal releases, you name it.The head airbag is in the A-pillar, the curtain airbag is in the headliner, and side torso airbag is in the seat. But that's not where the sensors are, or they would be pretty useless for detecting changes in inertia. The side sensor is indeed in the doors, which is where the car can be hit, and is either a pressure sensor or MEMS accelerometer, or both.Installing aftermarket space fillers won't necessarily disable the sensors, but of course one has to consider whether the added cushioning will affect their efficiency. Servicing/replacing them may also be messy.</blockquote>