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What are the reasons for the failure of the rearview mirror heating function?

1 Answers
NadiaLynn
07/29/25 12:19pm
The reasons why the rearview mirror heating does not work include a blown fuse for the rearview mirror heating, issues with the rearview mirror heating circuit, damage to the rearview mirror heating switch, or damage to the rearview mirror heating lens. Methods for repairing rearview mirror heating: If the housing or lens of the vehicle's heated rearview mirror is damaged, the owner can simply replace the component at an auto repair shop. If the rearview mirror heating function malfunctions, it may be due to a loose connection or detached wiring. The owner should take the vehicle to an electrical repair center for inspection. If the heated rearview mirror is severely damaged, it is recommended that the owner replace it with a new one at a car dealership. The button for rearview mirror heating is the same as the one for the rear windshield heating. On the air conditioning panel, there is a button with a fan shape and an upward arrow—this is the switch. Pressing it to light up activates the function. When turning on the rearview mirror heating, be careful not to confuse it with the front windshield heating. While the models may differ, the heating symbols are the same. Function of rearview mirror heating: Rearview mirror heating works by installing small electric heating wires inside the mirror lens. When the owner activates the heating function, these wires quickly heat up to a fixed temperature, usually between 35-60 degrees Celsius, within minutes. This helps defog and defrost the mirror. The rearview mirror heating function is most useful in rainy, snowy, or foggy weather, ensuring clear visibility. In addition to knob-type switches, some vehicles have button-type rearview mirror heating controls. These are typically found on the control panel, shaped like a square box with three upward-curving arrows. Pressing the button activates the heating function. Precautions for using the rearview mirror heating function: After turning on the rearview mirror heating, the defogging or defrosting effect is not immediate. It takes some time for the heat to dissipate the frost or fog. Using this function too frequently or for more than 30 minutes at a time can affect the lifespan, clarity, and brightness of the rearview mirror. The rearview mirror heating function usually activates only when the external temperature is below 20 degrees Celsius. If the outside temperature is high, the heating function will not work even if the switch is turned on. The rearview mirror heating function is designed to remove fog and frost from the mirror surface, not to eliminate raindrops in heavy rain. During heavy rain, the heat generated by the heating wires is insufficient to evaporate continuous raindrops, so the mirror may still become blurry, affecting the driver's visibility. For vehicles with rearview mirror heating, the mirror lens is different from ordinary ones—it has a heating function socket. When replacing the rearview mirror lens, be sure to pay attention to this detail.
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