The sensors are in the front seats, they start as a closed circut & when a person sits in them the circut opens...if they aren't working then fot what ever reason the circut isn't seeing an open circut, to pinpoint try unpluging the seat sensors, that would create a open & the starter shouldn't crank..If it still does the you've veried the problem is elsewhere so you'll need to move to the starter interupt relay...I can't tell you where that would be on your Charger but at least you have a direction to try...Good Luck..