if ABS/STc service lights up it may not be the unit. 90% of the time it is but my problem was the pump its self. remove plug on side of unit and connect a 12volt supply for a few seconds and try and hear it running. if not it is jammed like mine or burnt out Volvo says the motor never goes but mine ...

does anybody know of a interface apart from the vct2000 that will work using the vardis dvd's