There was a list of the flashes posted a while ago.
If it is the ultrasonics this works....when you switch the engine off turn the key back to "marcia" and then off again. The LED should remain lit for a few seconds, this has disabled them.
Whenever I get out of the car after it is warm I have a similar problem. The car starts to cool inside and sets them off....most annoying!!! Also does it in summer, again related to temp inside the car....is this your problem perhaps?