Today I took my Mercedes to a shop for a new headliner later they call and told me the car won't start but the lights all come on ok so it not the Batt that all I know for now but I thinking a week or so ago my trunk wasn't close good and it wouldn't let the car crank at all the key was dead I now thinking do Mercedes have something that keep them from starting if the doors or something is not close good ? This car alway start when you hit the key.