A8, thanks for your reply. I will check the reverse lights switch as you suggested, since they died before anything else.
However, I need to clarify that everything else died at the same instant, so Im thinking it is only one failure for all systems, something that they share, whether its a relay, or else. About wiring diagrams, tough to find here in south america. Is there a service manual somewhere online? Thanks again. In this car everything is electronic so it makes it tougher to determine the problem. However, I will try suggestions for a few days before considering the dealership.
About the switch under the gearbox, will I find instructions on how to get to it, with a simple search in the forum?