Audi A4 2002, Tiptronic, back-up light problem

Back-up lights and passenger mirror behave as if the car was in reverse, regardles of the gear shift position. Does anybody have an
idea of what the problem could be. Which modules to concentrate on? Is there a back-up light switch? If so, where is it?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.