Soft 'beep' when I turn off ignition to 2007 HHR LT

Sometimes when I turn off my car I hear a soft, very short ‘ding’, like a computer beep. Not sure where it comes from or why its there. Anyone have any idea? Thanks.

Perhaps your owner’s manual will tell you. Have you looked?

Does it happen when the radio is on? I ask because I have found some Sony radios make a beeping sound when the car is turned off.

I read the manual and it mentions nothing about it. Good idea though!

I can confirm Ranck’s statement. Perhaps this is the source.