i've got Autodiagnos but only ever used it on 2 early volvo's with the large box plugged in between the leads and never got any live data reading on either.

On newer models with the later pod you do seem to get live data so i think it must be the age of the car.

I've never looked through the Volvo data discs i have as autodiagnos made the original equipment so i would think there must be some good info on Vadis info systems.