So I did a little research today.
My car has DSP (first generation) and it has the socalled Business RDS. I tried a Professional module today and it didn´t work at all just like the BM54back wont work. Tape runs okay when the Business RDS is installed. It seems the FM passes thru wenn the car is cold meaning when I turn on the radio it works for about ten minutes or so then it cuts of the sound when operating in FM mode. I hear white noise in the background which leads me to think that it could be a tuner prob or? At this point it cannot be the antenna amp as I have switched it already.
My question now is why the h... can´t I get the Professional RDS to work with my DSP? Is it because the later version was digital and mine is analog or? I really need to get the facts straight here.