Hi …have the following problem with my Volvo S80 T6 : If you connect the battery (is new ) and I open the door, I have a ticker in the interior (as with unmounted belts ) on the other hand if you place the key on position 2 ( ignition ) additionally flicker the light / floor light and the side lights. In the speedometer only the indicator for errors lights, otherwise the speedometer is without function no further indicators for kilometers,light machine, brake etc. If you try to n Engine to start it starts briefly ( ca. 3-4 sec. ) afterwards it goes off again. Whatever happens after you have switched on the ignition. goes the radio but the display is still blind …After ca. 10-20 sec. is the display you can now also search for transmitters the climate can be changed from Automatic to manually and the blower goes at once…as well the seats can now also be adjusted electrically….If you try to start a second time it runs a little longer but goes there despite The car. was read out at Volvo, supposedly the ECU…had talked to two companies today to repair the ECUs…both were of the opinion it could not be. Maybe someone knows advice or knows the mistake…about your help I would be pleased… Greeting and thank Hans-Joachim