To change the signal light on a Buick Terazza remove the headlight above the turn signal. Open the hood, there is one bolt/screw on the the top-outside edge of headlight and a 4--5 " L shaped fastner on the other side. Turn the L fastner and pull up and out. Now work the headlight out around the seals. The turn signal is directly below. Turn the light socket counter clockwise to remove bulb.