I have a 01 Megane with the same problem which I beleive to be a blown bulb. I came on the site to try and find out what type of bulb is used as to access it you need to remove the top of the dashboard (first unclip speaker covers from dashtop to access screws etc(most screws will be 6 sided star shaped 'torx' type)) will post bulb type if i find it elsewhere
rich, October 2006