after a bit of an argument with the "tech" at Audi who had "installed hundreds of these without issues" i pointed out the error of his ways by not reading the manual correctly, cue a huffy moment from him... he then walked off saying "i don't know then".. 20 minutes later a young tech came out, fixed the issue and showed me correct operation of it. Shows you, sometimes the older guys just don't care and give the young ones a bad reputation. I did make sure the dealer knew of my experience though.