2014 LX570 Hello- just wanting to know some inputs. Upon start up- loose coins sound by skid plate area esp when turning wheel both sides-intermittent- usually on cold starts. California weather. Decided to engage L4, H4, C/D- it engages and works but involves a chug sound once engaged. I hear the sound on the front and feel it in the brake pedal. Does this sound normal? No flashing lights, engages normally. Thank you in advance.