It's all part of the same system, that being the Auxillary warning/graphic display, it has two ECU's, on the Saph one behind each kick trim, should be the same on 3DR.

I can never remember but I am sure the one on the drivers side is the lamp failure module but as you have problems elsewhere I would check the main control one on the passenger side, there is a common earth point behind the kick trims, which the system connects to, it's worth checking this hasen't rusted etc, brown btw is earth.

Martin