1997 Lincoln Town Car Owner's Manual - Page 94

There are two light sensors (photocells) in this mirror. The sensor that detects rear glare is located inside a window in the center of the mirror. The second light sensor which determines outside light level is located on the backside of the mirror case. The driver's side mirror is activated by these sensors to prevent glare when traffic is behind or around the vehicle. NOTE: Do not block the sensor on the backside of the mirror (i.e., with a parking tag, car deodorizer, etc.) since this may impair proper mirror performance. 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. Do not clean the housing or glass of any mirror with harsh abrasives, fuel or other petroleum-based cleaning products. Sun Visors Using the Sun Visors To block the sun, move the main visor down. If equipped with a secondary visor, move the main visor to the side and move the secondary visor down. The passenger sun visor 90