So much work for nothing
But I see that you show a great desire to practice your (un)soldering skills
All you had to do was follow the wires from the tmc connector to the chip

But, from specifications:
...Car charger with integrated TMC Traffic antenna... >> it mean that the device receives a signal via USB cable (or is even the whole receiver in the cable?)
Anyway, it further means that the data lines from the usb cable are in charge of TMC signal transmission.
And that the chip they reach is either a receiver or a TMC signal decoder.

Edit:
judging by these [Only registered and activated users can see links. ], it is still just an antenna.