What are the reasons for the inability to adjust the rearview mirror up and down?
3 Answers
The reasons for the inability to adjust the rearview mirror up and down are: 1. Poor button contact; 2. Misalignment of the white screw inside the mirror; 3. Damage to the motor gear or failure of the wiring harness. The rearview mirror is a tool that allows the driver to directly obtain information about the rear, side, and lower parts of the car while seated in the driver's seat. The adjustment methods of the rearview mirror are divided into: external adjustment and internal adjustment. According to the installation position, it is divided into: interior rearview mirror, exterior rearview mirror, and under-mirror. The design requirements of the rearview mirror are: 1. Shape and structure that protect pedestrians and occupants from injury; 2. Conform to the overall styling concept of the vehicle; 3. Shape that reduces air resistance; 4. Performance that adapts to various climatic conditions around the world; 5. Selection of structures and materials suitable for mass production.
I've been driving for over a decade and have encountered several instances where the rearview mirror wouldn't adjust. There are four common causes: first, a blown fuse—that little component hidden in the fuse box near the driver's seat can be replaced by finding the corresponding label; second, poor contact in the switch button, where dust or aging causes oxidation on the contacts, requiring cleaning or replacement; third, the mirror motor getting stuck or burned out, especially in cold winter weather when mechanical parts are prone to freezing; fourth, a short circuit or broken wire, such as when rainwater causes corrosion at the wire connections. Once, during a night drive, I faced a motor failure and had to manually adjust the mirror temporarily until I replaced it with a new motor for a permanent fix. I recommend avoiding high-pressure water sprays on the mirror body during car washes and checking the tightness of wire connections monthly to prevent issues. If something does go wrong, don’t rush to fix it—first pull over safely.
I usually enjoy tinkering with car modifications, and when the rearview mirror can't be adjusted, it's usually due to a glitch in the electric system. Possible causes include a faulty control module, which prevents signal transmission, or rusted wiring contacts that cause a circuit break when powered. Think about it—when wires age, even the motor can't turn, so the mirror naturally won't move. Blown fuses are also common, especially in cars with high-power audio modifications. When I helped a buddy fix his car, I tested the voltage and found that simply replacing the adjustment switch solved the issue. Mechanical jamming is another possibility, but regular lubrication can prevent it. Remember, a stuck rearview mirror affects visibility and safety—always disconnect the power before attempting any DIY fixes to avoid short circuits. If you can't figure it out, take it to a professional shop for a diagnostic scan. Regular maintenance, like keeping the mirror clean, can extend its lifespan.
