Sounds like your COM2000 is faulty. Either replace it with a new switch (expensive) or you could try to clean it up and repair it.
http://www.howtomendit.com/answers.php?id=333085
also see
http://philsworkbench.blogspot.com/2009/12/peugeot-206-indicator-stalk-repair.html
ChicksFan
September 2011