I can't hear the beeping of the indicators on my new CRV 1.6 iDTEC Auto - perhaps the frequency is too high or they are not loud enough. Can I (or a service engineer) alter them?

wife's '01 CRV ... original stereo... stays on for 2-15 seconds and then, no sound. All digital info (station,etc ) still showing but no sound. Turn it off and wait a bit...turn back on and same routine. Does this sound like a problem in the head unit, wiring...maybe a short? Don't want to...