I've had this car for over 5 years now and my daughter has just asked me what this is. Her father-in-law has one in his Honda Accord and like me he doesn't know. Can someone please enlighten me? My best guess is something to mount a satnav on. Thanks.

Pretty sure it's a sunshine sensor for the A/C system.

Okay langers2k, I'll go with that, unless anyone has any other idea. Thanks a lot.

I'm also sure It's a sensor for the air con system. I guess you have climate control?

Yes moley, I have climate control, but I have never really understood it or used it very much. Further to that, I had a new part/module fitted last year (£60) because it was leaking and my friend that did it told me that I still have a very small leak on a radiator and would cost me in the region of £400 to replace. As I don't use the aircon very much, I will live without the expense. Thanks for your help.