Join Date: Sep 2015
Location: Milwaukee, WI, USA
Mentioned: 2 Post(s)
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If it's just an array of pressure sensors acting as a series of switches, then RF would not affect those in any way unless the RF was sufficiently large enough to induce enough voltage in the wire to arc across the gap on the switches or by producing enough voltage in the wire to make the computer think a switch had closed even when it had not. There's no way there's that much RF being emitted to cause an arc and it's doubtful at best on the latter scenario, too. Also, I've had other relatively light non-electronic objects besides my phone (e.g.: a small bag of take-out food for example) set it off in my car, so there's that, too.
My guess is that they just are either far too sensitive or they're mounted too close to the top surface of the seat. That would allow the pressure to interact more or less directly with the sensor without allowing the foam seat cushion to disperse the load for light objects. There's no excuse for having objects less than 1 lbs (0.5 kg) set these things off, if you ask me. The warning is there to protect passengers, not sandwiches. Or is this just Mazda's way of trying to encourage us to never have unsecured objects anywhere in the cabin space? If that's the case, then they should be getting rid of cup holders next.
His: 2018 Mazda6 Grand Touring, Machine Grey Metallic
Hers: 2016 CX-5 Sport, FWD, Reflex Blue