My building is changing to a new garage access system and gave us new RFID stickers to open the garage door. We were told to install them on the BACK of the rearview mirror. As there is a "box" in front of the mirror, I questioned whether the sticker would work. As RFID in NOT "Line of site", I assumed the sticker would work. Installed the sticker on the rear of the mirror and discovered that both the side and rearview mirror became darker (the dimming function). Discovered that the sensor for oncoming headlights is in the rear of the mirror, so I removed the sensor and the mirror dimming returned to normal. So, I want to install the sticker somewhere on the "box", but I'm sure the box houses sensors for the cruise control, auto braking, etc. Does anyone have an idea where the sensors are located in the box in front of the rearview mirror?