The heating part of Buick Regal rearview mirror is marked with a back button in the middle of the car center console. Press this button when you need to heat the rearview mirror. Heating will not be completed immediately to eliminate rain and fog. It is also necessary to completely evaporate the rain fog through the heating wire on the lens to make the rearview mirror clear. The folding mode of Regal rearview mirror can be divided into manual folding rearview mirror and electric folding rearview mirror. Manual folding rearview mirror: Fold the rearview mirror towards the car body to prevent damage during automatic car washing. Push the rearview mirror outward to restore it to its original position. Power folding mirror: There are two folding mirror buttons on the driver's door. Select the driver's or passenger's rearview mirror, and press the arrow keys to move the selected rearview mirror in the required direction, so that the rearview mirror can be folded in the car without reaching out to adjust the rearview mirror. (Not all models) Note: Do not use the folding function of the electric exterior rearview mirror when it freezes in winter, otherwise it will damage the rearview mirror. After thawing, it can be used or folded manually to break the ice, but it must be reset electrically.