Quote:
Originally Posted by cooltoy
This is what it is on a BMW. Ours could be similar.
"The small white square on the back of the mirror is one of the photocells for the auto dimming functionality, there is also one in the front. Together they check the light behind and in front of the vehicle and use it for the rearview and side mirror(s)."
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Good deal, I'll cover it and if there's an issue I can pop a hole to expose the sensor once again.