1996 Ford F250 Owner's Manual - Page 134

To turn the mirror on, push the On/Off switch, located on the bottom of the mirror, to latch it in the ON position. The button will be latched in the up position and at night a low intensity green light will be visible from the button when the mirror is turned on. To turn the mirror off, push the On/Off switch again and the button will unlatch shutting off the light and the mirror will be off. Demonstration - The mirror's operation may be demonstrated by simulating glare as follows: 1. Cover the forward facing sensor, located on the right side of the mirror back, with a dark (preferably black) cloth. Hold the dark cloth over the sensor until you notice the mirror glass start to darken to the non-glare state. If the surrounding lighting conditions are too dark it may be necessary to shine additional lighting, such as from a flashlight, on the rearward sensor located on the glass face. Remove the cloth (and shut off the flashlight if applicable) and the glass will return to the clear reflective stage. 2. One important safety feature is that the mirror automatically returns to the normal position whenever the vehicle is placed in R (Reverse) (when the mirror is in the ON position). This feature ensures a bright clear view in the mirror when backing up. 132