Why doesn't the Audi A4L rearview mirror heating work when turned on?
2 Answers
Audi rearview mirror heating not responding. The Audi rearview mirror heating setting only operates when the ambient temperature is below 15 degrees Celsius. Therefore, if the rearview mirror heating is not working, the first consideration should be whether the outdoor temperature is too high. If the temperature issue is ruled out and the rearview mirror heating still doesn't work, it is necessary to go for a timely inspection and repair. Additional information: How car rearview mirror heating works: It is generally more suitable for rainy or snowy days. When the rearview mirror is heated, the heater behind the mirror quickly heats the mirror surface, gradually removing rainwater or fog from the mirror, saving the driver the trouble of frequently wiping the mirror manually, thereby reducing driving hazards.
I've encountered similar issues, having worked on cars for years, rearview mirror heating problems are quite common. Possible causes include a blown fuse, usually found in the fuse box—check the ones related to headlights or heating. If the fuse is intact, the heating element might be faulty; Audi A4L's mirror heating elements tend to age quickly, especially with frequent switching. Poor wiring connections are another common issue, where loose or corroded plugs disrupt current flow. Additionally, control switch or relay failures can occur, and sometimes the computer system misjudges the temperature, preventing heating activation in very cold weather. A simple self-check is recommended first, like waiting a few minutes after turning on the heating switch. If that doesn’t work, test the fuse. Fixing this isn’t hard, but professional tools are needed to check voltage to avoid damaging other components. In short, don’t delay repairs, especially in rainy or snowy conditions where poor visibility makes driving more dangerous.