I must add that, although my dongle was supplied (nicely tucked in underneath the seat) they never fitted it on my 1000km service. When I queried this they said I had to specifically request them to fit it (simply plug it in), to eliminate liability issues. Which makes sense, I suppose, but then at least tell me about it.
Anyway, just check if your dongle isn't attached to the underside of your seat. Little red thing, looks almost like a memory stick. If it is, just plug it into the recepticle which is also underneath the seat, close to the ECU's connector.