3 - 54-Pin ConnectorT54a

Fig 1: 3 - 54 Pin Connector (T54a)

Courtesy of AUDI OF AMERICA, LLC

39 -  CAN bus low, instrument cluster

40 -  CAN bus high, instrument cluster

43 -  Terminal 30

44 -  Terminal 31

47 -  Terminal 31 to the Rearview Camera -R189-

48 -  Rearview Camera -R189- power supply