Interior mirror dimming - half working?

Zummerset

Member
Hi,
Just wondering about the possibility of my Coupe's interior mirror dimming function only half working.

In daylight the mirror is undimmed. If I cover the sensor that faces forward to simulate night, the mirror dims slightly as it should.

If I now shine a light at the rear facing sensor it doesn't dim any more. I sort of presumed the dimming function either worked or didn't, mine seems to half work. Any ideas please?
Thanks, Andy.
 
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