Need help no power getting to ECU

[A6quattro6]

Hi if anyone can help and direct me to the right place. I have no power to my ecu I’ve checked all the fuses there all fine I’ll replace the relays. I have power but nothing seem to be working. My key doesn't come out the barrel my door doesn’t lock and unlock an no power to the fuel pump. Can anyone help I have a Audi a6 2.7 Quattro 2006

Edited January 20 by A6quattro6

[Steve Q]

Have you had a diagnostic check to see if any fault codes flag up? 

Has the cabin had an ingress of water at all? 

The ECU could be at fault, you could get it sent away to be tested.