I sometimes notice these very quiet beeps when I'm driving. I believe they are the audible alerts for things like the LKS (lane keeping) and collision mitigation system. The thing is, they are just barely audible. They are so quiet that to hear them at all I have to have the radio off. Looking in the manual (on page 328), I think there are three settings (High/Mid/Low) for these alerts under Vehicle/Meter Setup/Adjust Alarm Volume. Mine are already set to high, and they are so quiet as to almost be useless. Is this how they are supposed to be? What use are they when they are barely audible on the highest volume setting? If anyone can shed light on this, I'd be very appreciative.