The inside rear view mirror in my 1999 Mercedes-Benz slk 230 (R170 model) is an electro chromic self-dimming mirror that has no manual backup. The mirror contained a fluid which leaked out causing the self-dimming mirror to fail to provide dimming against rear approaching headlights resulting in the driver to either be blinded or to have to turn the mirror away which greatly eliminates rear view capability in the interior. There are many documented cases of these mirrors failing in various makes and models as a result of usually from the internal fluid leaking.

- San Francisco, CA, USA