A question has been asked how to remove the wing mirror cover to indicator unit, on the Avensis T27 from 2009 to 2015. Flat bladed tools are required like trim removal tools, but screw drivers will do. Starting from the top side, carefully insert the tool between the cover and black border, then gently lever away.  Work around the the cover with another tool I fold the mirror to work to tool down. Then firmly pull the top of the cover away and down. The cover will come away. Lo