It only burns one brake lamp, with light on all lights.

Hello, have seen at my mother the other day that all the brake lights are shining on her, whether she is braking or not, and when she has the light off, only the upper one, but only when she is braking. Got a brake light switch for me today, because I thought it was because of it, but after the change the error is the same. In the error memory is the following: in the engine control unit: 17911 – Load signal from generator terminal DF 16955 Cruise Control/Brake Switch A Circuit Malfunct ion In the ABS ECU: Load signal, lazy message from engine control unit -intermittent Need your help because it can’t continue.