Strangely enough my wife has been complaining of a Peep, Peep, Peep first thing in the morning....
Her TDI does it,usually on a very cold frosty morning when the battery is only just capable of kicking the engine into life. maybe the battery is on the way out (it's a '97 car with 183,000 miles).
If I charge the battery the Peep disappears -weird or what??