OK, it is finally working.
It seems that the parts guys are not familiar with the tow package parts. Since I purchased the hitch elsewhere and wanted only the harness and any parts needed to get the electrical part to work, they had no clue what parts to sell me.
Repeaded call always went in the direction of ... "well, if you are installing it yourself, you are doing something wrong" or "the problem is you are using a draw tite hitch".
I escalated the issue to the parts director and he got a tech involved. Tech stated "all you need is the harness and plug it in..."
Well, I pointed out that the manual shows a piece, looking like a module with a clip on it and my harness had only an empty plug.
The parts director was so kind and made some phone calls. He got me the missing module and it now works. He actually gave it to me for free.
Just thought this might be helpful for someone that expiriences the same problem. The harness needs a seperate brake and indicator module to work.
regards,
Sab.