What causes the Jetta's light fault indicator to illuminate when the lights are not broken?

[LaCarson]

The reason why the Jetta's light fault indicator illuminates when the lights are not broken is due to poor internal wiring contact and high circuit resistance. Precautions for using lights are: 1. Turn on the low beams when driving at night; 2. Do not use high beams when driving closely behind another vehicle in the same direction; 3. When passing sharp curves, slopes, arched bridges, crosswalks, or intersections without traffic signals at night, alternately switch between high and low beams as a signal. The method to turn on car lights is: 1. Turn the left light control switch forward one notch for parking lights; 2. Turn it forward two notches for low beams; 3. Push the light control lever forward once for high beams.