Brig-Diag doesn’t get a connection to the ECU

Hello ! I already mentioned it on the edge…. I don’t get into the controller with the Brig Diag from the Delch (V70I, Bj98, 2,4T) The connection monitor shows: Open Com- Port…. ok connect to the controller… failed ECU does not answer both (i.e. the USB and the Brig Diag) run on COM-Port 3 Terwi ́s Brig Diag (which works with his two Volvos) does not come in (same procedure) However, I can’t connect to the ABS controller, the combi instrument etc. Does the EVERYTHING run over the controller? Or can this only be due to the OBD plug or cables?