Hi All, I'm probably going to feel a bit stupid asking this question but all of a sudden my '94 SC400 is making a beeping sound after I turn off the engine and remove the key. The lights are off, even the door closed and it still makes this beeping sound which it never made before-- can't seem to find a topic in the Owner's manual to cover it. Can someone give me an answer to why so I can turn it off or something?