Why is the Audi A4 rearview mirror not heating up?

1 Answers
HaileyAnn
07/29/25 10:19pm
The reason why the Audi A4 rearview mirror is not heating up could be due to a blown fuse for the rearview mirror heating, a malfunction in the rearview mirror heating circuit, a faulty rearview mirror heating switch, or issues with the heated mirror glass. Function of heated rearview mirrors: When the button is pressed, the electric heating element behind the rearview mirror glass quickly heats up to a fixed temperature within a few minutes, typically between 35-60 degrees Celsius. Steam will emerge from both left and right rearview mirrors, and the water droplets on the mirror surface will gradually evaporate as the temperature rises, while the fog slowly disappears. This achieves the effect of heating the mirror, defogging, and defrosting. Precautions for using heated rearview mirrors: Each use should not exceed 30 minutes, otherwise it may affect the lifespan and clarity of the mirror.
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