2006 odyessy continuous warning sound from speaker
 

Hello all. The right rear speaker from my 3rd gen Odyessy makes a high pitch continuous warning type sound when I am in drive or reverse only and it never stops. The radio is off and there are no "door ajar" indications. It just started doing this for no apparent reason. Please if anyone has a clue as to what this might be, please let me know! Thanks!