Will disconnecting the lights not cause fault codes if the BCU thinks they are bulb failures? Might need realys with changeover contacts and switch in a resistor?Yeah, this is definately doable but not easy. You will need 6 relays. Peugeot uses 4 wire brake pedal sensor, when 2 contacts close, other two open. So 2 relays to brake pedal and two for DLR as they are independet of each other and two for rear lights.