When our parking sensors go from 1 yellow dot to 2 to 3, etc, should the parktronic beep? Or does parktronic only beep when the red dots light up? Mine does the ladder which is annoying. I remember on my SL55 however, that any yellow and red lights both produced beeps…the more the lights the faster paced the beats....by my e55 doesn't make a sound until the red dots come up, and at that point it's almost too late!! lol