Turn lights relay buzzing and NO RPM, oil pressure, coolant temperature displayed
 

The turn lights are working also as an emergency stop flashing but when I turn them off, the relay starts buzzing. The windshield wipers and heating of the rear window seems in working condition but do not stop buzzing when they are turn on.
I see no RPM, oil pressure, coolant temperature on the display, only speed and economy gauge working.

Why the relay is buzzing? It should be direct current (DC) in a car – constant +12V or 0??

The buzzing relay part number is 201 821 00 47.
05 8983 00
12V/2(4)x21W
max 6x32cp
DOT SAE
J 590e/945b

I checked one more time fuses - the fuse 5 is burned. It was too dark and I missed at first time. Everything is working fine after a replacement of the fuse 5. No buzzing.