Can anyone tell me what to do about my rearview mirror staying dim all the time? It is suppose to dim when the bright lights get behind you to keep the lights from blinding you however mine stays dim all the time. Is there a reset or anything i can do?

 

Is there any thing blocking the sensor?

 

Nothing blocking however when i put my finger over the sensor it will lighten up!

 

Scrug,
Have you recently tinted your front side windows? Have you tinted your rear windows darker? If so there might not be enough light to keep your mirror in daytime mode. Below is from Ford service manual explaining operation of auto dim mirror. The mirror should go in high reflectance mode when shifted into reverse. If mirror reacts properly, think of something you done to change the equation. let me know what you find out.

Auto-Dimming Mirror

The interior rear view mirror may be equipped with an auto-dimming option. This feature automatically reduces the glare caused by headlamps reflecting in the mirror. The auto-dimming feature is disabled when the vehicle is in REVERSE. Power is supplied to the auto-dimming interior mirror when the ignition is in the RUN or ACC position.

The automatic dimming feature has 2 photoelectric sensors that detect forward and rear light conditions. Based on these inputs, the automatic dimming feature adjusts the reflectance level of the mirror glass to eliminate unwanted glare. The reflectance level of the mirror glass is variable and depends on the amount of rear glare in relation to ambient light conditions in front of the interior mirror.

When the forward sensor detects daytime conditions, the rear sensor is inactive and the mirror stays in a high reflectance mode. When the forward sensor detects nighttime conditions, the rear sensor is active and detects glare from the headlights of vehicles approaching from the rear or other glare-producing light sources. To provide increased visibility when backing up, the mirror will automatically return to a high reflectance mode whenever the shifter is placed in REVERSE.

If the forward or rear sensors are blocked, the automatic dimming interior mirror might not work correctly.

 

Glad i saw this, mine has been dim since i bought the truck! Time to hit the dealer.

 

This had me so frustrated that I tore a pice off of a postit note and stuck it over the hole in the mirror. Done.

I could not find an easier way to turn the freakin' thing off.