Upon starting the vehicle and then using the stop pedal, the dashboard indicator illuminates, indicating a fault in the lighting circuit. I thought it was a malfunctioning brake light, however all are illuminated. I have conducted a visual inspection of all the lights and found none that are unlit. The indicator activates only upon depression of the brake pedal and remains illuminated until the ignition switch is off. The indicator activates just while the vehicle is in operation and the brake pedal is engaged. Suggestions? Thank you.