Problem with 964 C4
 

I`ll try and discribe it the best i can: when i turn the key and start the engine she make`s a check and then she turns off all the warning lights from the panel at the dashboard but after a while i hear a tak-tak-tak somewere from behind the dashboard left top side and then she opens the (!) light and also the red light which is for when 4X4 is engaged....i suspend a relay but which one,where is located, what part number??? Please any help will be much appreciated.Thank you all.Louis/Athens/Greece