[Studmuffin]

Quick question, can anyone tell me why there is a hole in my rear view mirror housing? It appears to be missing a small oval button on the front, but when I search for answers, every SSR mirror on the internet seems to have the same hole.

Would anyone be able to tell me what's missing here?

 

[Autoprof]

From the service manual

INSIDE REARVIEW MIRROR WITH THE AUTOMATIC DAY-NIGHT FEATURE SYSTEM OPERATION
The inside rearview mirror uses 2 photocell sensors. One sensor is the headlight sensor, located on the rear side of the mirror. The other sensor is the ambient light sensor, located on the front of the mirror or windshield side. With the automatic day-night feature enabled, the mirror uses the ambient light sensor to determine the exterior light condition. With a low light condition detected, and a high light condition from behind at the headlight sensor, the inside rearview mirror will automatically darken the face of the mirror. In the daytime, the mirror is in a normal state because of the high light condition that is indicated by the ambient light sensor. With the gear selector lever in the REVERSE position, backup lamp supply voltage is supplied as an input to the inside rearview mirror. In night time conditions only, the mirror monitors this input to disable the automatic day-night feature which allows the face to gradually change to a normal state. This allows the driver to clearly see objects in the mirror when backing up. The mirror also disables the automatic day-night feature when either door is opened and the courtesy lights are illuminated.

I hope this helps

See you Saturday,arty Looking forward to seeing your UV.

 

[oldxr]

AutoProf....definetly the GURU of electronic functions on the R. Another helpful bit of info shared.

 

[Studmuffin]

That makes sense.
It's just odd that they left it as just a hole instead of giving it some kind of protective "lens"...