I am pretty sure they are the accreditation body that used to do the VDA series of documents, I know a guy who works there. They are like the dot and FMVSS in the US.
Try this simple trick: Go to Google Search, enter "kba.de".
In the search results, click on 'Translate this page'.. It is not a precise translation but probably enough to give you an idea.
__________________ You are never given a wish without also being given the power to make it true. You may have to work for it, however. ~Richard Bach