Autodim mirror fault

[jupiter2step]

Yesterday a numpty in a Citroen C5 parked so close to my driver's door I had to climb through via the passenger side to access the driver's seat.

En route I whacked the rear view mirror with my knee. The result is that the rear view mirror is now permanently on autodim mode, so that it is darkened during daylight hours. I figure I have probably broken a sensor. Can these sensors be replaced easily or will I have to replace them with a whole new unit?

 

[Dieselman]

The sensors are just photo-diodes, so not easily damaged. possibly you have misplaced the front sensor so the rear one sees more light thus makes the mirror go dark.

Alternatively you have damaged the LCD. Try unplugging the mirror and see if it goes lighter.

 

[jupiter2step]

Thanks Dieselman. The dimming does indeed disappear when unplugged and when reverse is engaged, so not sure what the problem could be. Spoke to MB and phone who told me I'd need to cough up £450 for a new one, I've seen breakers selling them for a tenth of that!

 

[jupiter2step]

BY way of update - turned out that the front sensor had just been knocked out of its socket. All working again