What is the reason for the Volkswagen rearview mirror heating not working?

[VonJanelle]

Volkswagen rearview mirror heating not working is mostly a symptom of the car's electric heating function. Below are the detailed reasons and solutions for Volkswagen rearview mirror heating not working: The electric heating function of the car's rearview mirror is not activated. Solution: Press the heating button and wait for a while, then touch the rearview mirror with your hand to see if it feels warm. If it does, it means the circuit is fine. Insufficient car battery power. Solution: Replace the battery or charge the battery. The rearview mirror heating switch is damaged. Solution: Go to a 4S shop for replacement.

[LaEllie]

I used to be a car enthusiast who loved tinkering with technology, and I've encountered the issue of non-responsive rearview mirror heating in Volkswagen cars several times. The causes seem to be varied. A blown fuse is the most common culprit—those thin strips in the fuse box that burn out to protect the system when the current is too high. The switch button is also prone to failure; internal contact wear can lead to poor connectivity, preventing signals from being sent. Wiring issues shouldn’t be overlooked either, such as loose or short-circuited connectors, especially after rain when rust can set in. If the heating element itself has aged, prolonged high temperatures can cause it to fail—check continuity with a multimeter during inspection. I recommend starting with the fuse: consult the manual to locate it, replace it easily, and test. If that doesn’t work, take the car to a shop promptly to diagnose the entire control module, avoiding blurred vision while driving in the rain, which could compromise safety. Remember not to modify wiring yourself to prevent accidents.

[Leonard]

As a long-time Volkswagen owner who drives daily, a malfunctioning rearview mirror heater can be quite annoying. I suspect it's mostly due to a blown fuse, which is super simple to fix—just open the engine compartment or the fuse box on the driver’s side, find a matching new fuse, and replace it. The switch button might also be stuck or faulty, so check if the indicator light is on. Another possibility is a wiring contact issue, such as a loose or corroded plug; try cleaning the connector. Safety first—if you're not familiar with electrical circuits, it's best to leave it to a professional mechanic. Spending some money can save you a lot of hassle. These kinds of issues are common during the rainy season, so a quick check during regular maintenance can prevent bigger problems. From personal experience, don’t wait until it rains to fix it.

[PiperMarie]

The biggest fear while driving is safety risks. A malfunctioning rearview mirror heater is very dangerous. Once, I almost rear-ended another car in the rain due to poor visibility. Common causes include a blown fuse or a faulty switch. First, check the fuse location as indicated in the manual. If there's a short circuit or the heating element is damaged, the current won't flow, causing it to fail. Immediate action is recommended: turn on hazard lights and pull over safely—don't risk driving further. If under warranty, visit a 4S shop for free repairs; otherwise, call a tow truck to a reliable repair shop for inspection. Regularly clean and maintain the rearview mirror to minimize malfunctions.