[tango131]

Ours also don't dim as much as they should, IMO. My boxster dims perfectly so I'm used to how it is supposed to work. I shined a flashlight on the center rear view mirror and the side mirrors did dim, it just took a bit of time and it did not dim dark enough. A not sure it's the angle of the mirror glass as the sensor is in the center rear view mirror. Btw, I think this is also how it works on my boxster.

It is clearly working, just not well as posted above. Also, the rear side mirrors dimmed without the edge btw dim and non dimmed shown in the pic posted above in post 26. In other words, the complete piece of glass mirror dimmed in ours. My boxter's mirrors dim like in the pic above with the edge btw dim and non dimmed glass showing. Interesting....