I'm slowly wading my way through my new Mazda5's owner's manual. [As if this trimester could get more "not fun," reading worsens my morning sickness.] Apparently the front passenger seat has weight sensors installed in the "sliders" (pardon my layperson terms). When the seatbelt is buckled but the seat senses less than about 66lbs on it, the airbag and pretensioners shut off, as indicated by a light on the dash. If less than about 92lbs is detected, the signal light is NOT illuminated, but the airbag and pretensioners may still be compromised. I currently have a rfing Britax Marathon tethered to the slider, which is bolted to the floor. Now I'm concerned that the rfing tether is affecting the weight-sensing systems of the front passenger seat and could compromise the car's safety features. What should I do?