My Airbag ECU wouldn't respond to Alfadiag or Unidiag so I am going to give it a try.
I have tried a different ECU so the ECU is ok, but it doesn't want to talk with the computer.
If that doesn't work I will have to do some more digging. I am thinking the Power supply for the airbag ECU has been lost somehow.
symon now I do not know what the model year of the GTV that you have, but some P1 was equipped with BECKER Air bag control units (10 pin red connector) and they can not be diagnosed with either the examiner, alfadiag. or FiatECUscan, you need to ground the
diagnos pin and read the flash codes from the air bag warning lamp if you have one of
these BECKER units.
And for the connection of interface cable, I would do as they recommend on FiatECUscan page, mount a switch between pin 3 and 7 as safety precaution, you do not want any signal to the air bag ECU when you are testing something else, if you have bad luck it may say boom.
When using the examiner for testing you are prompted when you are about to test some
air bag ecus to disconnect the air bags and put in dummy resistors instead as there
is a small chance that you may trigger an air bag during the test.