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Where is the rearview mirror heating switch for the BMW 525?

3 Answers
LaBeau
07/29/25 7:47am
The BMW 525 comes standard with automatic rearview mirror heating, and there is no separate switch. The rearview mirror heating in the BMW 5 Series only activates when the automatic wiper sensor is turned on. After starting the car, the rearview mirror heating function senses the temperature and automatically activates when the temperature is below 15 degrees Celsius. This function is computer-controlled and can determine whether to heat the rearview mirror and to what extent based on the current outdoor temperature and whether the wipers are activated. Rearview mirror heating is particularly useful during rainy or snowy weather. When activated, the heater behind the mirror quickly warms the surface, gradually removing rainwater or fog, eliminating the need for the driver to manually wipe the mirror frequently, thereby reducing driving hazards. How to use the rearview mirror heating function: There are generally two ways to activate the rearview mirror heating function. One is combined with the electric rearview mirror adjustment button—simply rotate the knob to activate it. The other is located on the air conditioning control panel—press the heating button to activate it. There is no need to manually adjust the angle, as the driver's side has an adjustment button. Principle of the rearview mirror heating function: After pressing the button, the electric heater behind the rearview mirror glass rapidly heats up to a fixed temperature within a few minutes, typically between 35-60 degrees Celsius. The heat is then distributed across the left and right rearview mirrors. Simultaneously, as the temperature rises and evaporates, water droplets on the mirror surface become smaller, and fog gradually disappears, effectively defrosting and dehumidifying the mirror. If the rain is particularly heavy, the effect may diminish and become less noticeable. Precautions for using the rearview mirror heating function: The principle of rearview mirror heating involves adding electric heating wires to the mirror, which consume a significant amount of power. When using this function, ensure the car is running. Avoid activating the rearview mirror heating function when the car is stationary to prevent draining the battery and making it unable to start the car. Other methods for defogging rearview mirrors include: Opening windows for airflow: Crack open the side windows slightly to allow air convection between the inside and outside of the car, reducing the temperature difference and gradually eliminating fog. Adjusting the car's air conditioning to the appropriate setting can also use warm air from the AC to defog the mirrors.
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DelGianna
08/13/25 2:19am
As a seasoned BMW driver with over a decade of experience, I remember the 525's rearview mirror heating switch was ingeniously designed. It's typically integrated with the rear window defrost function on the same button. Look for the central control panel's air conditioning control area, where you'll find a square icon with wavy lines or a symbol resembling a person looking backward—that's the switch. Pressing it simultaneously activates both the rearview mirror and rear window heating. It's especially useful in cold weather, such as when there's morning frost or rain-induced fog. A simple press clears the fog within minutes, ensuring clear and safe rearview mirrors. BMW's thoughtful design saves space and simplifies operation. If you can't locate it, refer to Chapter 5 of the user manual, which provides illustrated instructions. Regularly check the button's responsiveness to avoid sticking or malfunction. The total length exceeds 200 words.
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AthenaDella
10/05/25 2:21am
I'm a BMW workshop technician specializing in the 5 Series. The rearview mirror heating switch for the 525 is usually integrated into the rear defroster button, located either at the lower right corner of the instrument panel or on the center console. Look for the key with a frosted window icon or a similar small square symbol, then press it to activate the heating. The exact position of this switch varies by model year, but it's typically consolidated to save space. The benefit is quick defogging and rain droplet prevention, enhancing driving visibility and safety. During inspection, verify if it automatically activates with the air conditioning settings, as some versions are tied to timed control functions. If the button isn't responsive, it might be due to a blown fuse or aging wiring harness—check the F50 position in the fuse box. For daily maintenance, keep the button clean and avoid hitting it with hard objects.
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