Locate the module based on your chassis:
BMWs are sensitive to low voltage. A weak battery or a failing Intelligent Battery Sensor (IBS) can sometimes cause the car to disable "non-essential" consumers like heated mirrors to save power. Recommended Fix The most common resolution for code 800FB7 is replacing the mirror glass 800fb7 bmw
The most common culprit is a loose or corroded wiring connector behind the mirror glass. You can carefully pop the mirror glass off using a plastic trim tool to inspect the two-pin or four-pin connectors. Locate the module based on your chassis: BMWs
BMW mirrors are typically heated to prevent fogging and ice buildup. They often activate automatically based on ambient temperature or when the rear window defroster is engaged. You can carefully pop the mirror glass off
To prevent future mirror failures, ensure the mirror housing is free of debris that could trap moisture. If you are replacing the glass, apply a small amount of dielectric grease to the electrical connectors to protect them from corrosion.