What does the rear button in a car mean?

[LeMargaret]

Rear refers to the rear windshield defogger. Pressing it removes fog from the rear windshield. Typically, the rear defogger switch automatically turns off after about ten minutes to protect the heating filaments. If the defogging effect is unsatisfactory after activating the rear defogger, it may be due to aging from prolonged use. Here is additional information: 1. Representation: The literal meaning of 'rear' is the back or rear part. In cars, the rear button appears in the air conditioning system and functions as the rear windshield defogger. However, many car models now omit the 'rear' label and simply use an icon. 2. Heating filaments: On the rear windshield of a car, you can see copper wires, which are heating filaments. Pressing the rear button activates these filaments to heat and defog the rear windshield. Usually, the rear defogger switch turns off automatically after about ten minutes to protect the heating filaments. In fact, many car models now also feature a front windshield heating system.