Honda Civic Owners Manual: Interior Rearview Mirror

Adjusting the Mirrors

...

Rearview Mirror with Day and Night Positions

Flip the tab to switch the position. The night position will help to reduce the glare from headlights behind you when driving after dark. Keep the inside and outside mirrors clean and adjus ...

See also:

Honda Civic Owners Manual. Synchronized Mode
You can set the temperature synchronously for the driver’s side and the passenger’s side in synchronized mode. 1. Press the SYNC button. The system switches to synchronized mode. 2. Adjust the temperature using the driver’s side temperature control dial. Press the SYNC button ...