Originally Posted by
HrdDrv
There is a black box under the dash, to the right of the gas pedal that chimes/beeps, mabe etc. Pull it and see if it cures it. On mine, though, I forget my lights were left on (rainy weather) but my new battery takes care of that mistake. (I wanted to have my radio on when my doors were open, and key on ACC, is why I pulled my black box...) Good luck and let us know.
That's its own buzzer tho, and it won't play the noise through the speakers... Is there a factory radio that makes a beeping noise under certain conditions? I know my aftermarket Sony unit will beep three times when it shuts off, did any factory radio had a similar feature?