Audi A6 rear right focus

Good afternoon colleagues, I have an Audi A6 and the rear straight focuses on time sometimes if other no ones, the focus connector does not arrive current in any of the terminals when trying it disconnected, check and all the fuses are fine but when moving the branch that reaches the 3 modules found in the trunk on the rear side, they begin to turn on until the vehicle is placed in motion and stop A sound begins and the witness light appears on the board.
Another fact is that he began to pass after the battery had changed.

Anyone knows which of the three modules is that of the lights? or if someone has electrical or manual diagrams.

Thank you so much.