One problem related to high/low beam switch has been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
2005 Chevrolet Trailblazer headlights dimmed while driving for no reason. Vehicle brought to dealer, they stated it was normal due to an air pump turning on and off. I felt it was very dangerous due to other driver's thinking I am flashing the headlights at them. That happened about 10 times a week while driving at night. I have found online many other owners with the same problem. . Read more...