The horns are positioned behind the left and right ends of the front bumper. To access the horns from below, apply the parking brake, jack up the front of the vehicle, and support it on jackstands. Next, remove the retaining screws to take off the lower front section of the wheel arch liner, and unclip and remove the brake disc cooling duct. After that, remove the retaining nut or bolt to take out the horn, disconnecting its wiring connectors as they become accessible. Installation follows the reverse order of removal.