What is the function of the switch on the Audi TT rearview mirror?
4 Answers
The switch on the Audi TT rearview mirror is an auto-dimming switch. When the ignition is on, it can automatically adjust the anti-glare state of the interior rearview mirror based on the intensity of incoming light detected by the sensor. At night, when strong light is detected, the photosensitive element controls the material to darken automatically, changing the reflectivity to achieve anti-glare effect. The Audi TT is a sports car developed by Audi, with body dimensions of 4178mm in length, 1842mm in width, and 1352mm in height, and a wheelbase of 2468mm. In terms of appearance, when viewed from the side, the Audi TT appears as if it gradually "expands" outward from the wheels, featuring identical designs at the front and rear, which shares similarities with the Porsche Boxster.
As an Audi enthusiast who frequently modifies cars, I must say the TT's mirror switch is quite feature-packed. The two arrow buttons on the left control the left/right mirror angles—make sure to select the correct L/R position when adjusting, or you'll be wasting your effort. The dot-marked heating/defogging function is especially useful in winter; just press it during rain or snow, and the mirrors will be clear in three to five minutes. The most practical feature is the folding button at the bottom right—press it in narrow alleys, and the mirrors will click and fold in to avoid scratches. Here's a small tip: never force the mirrors open when they're folded during car washes—a friend of mine once damaged the gear mechanism. I recommend putting a bright sticker on the heating and folding functions; beginners tend to forget about them.
Having driven the TT for three years, I've long mastered the rearview mirror controls. Look closely at the control panel: the L/R toggle selects left/right side first, then the rotary dial adjusts mirror angle. The middle button with frost symbol activates heating - my test showed frost melts within two minutes at zero degrees. The rightmost folding button is most practical - press it when parked roadside to avoid collisions, folding mirrors 90° inward. Accidentally discovered: long-pressing the lock button after vehicle locking also triggers auto-folding! Audi's clever design includes backlit buttons to prevent nighttime errors.
I've worked on quite a few Audi electrical systems, and the TT mirror switch is one of the most user-friendly designs. The four buttons separately control three major functions: adjustment, heating, and folding. First, use the L/R toggle switch to select the mirror, then the knob allows for fine-tuning of the viewing angle. The square button with a wavy line is for electric heating—it defogs faster in rainy weather than the rear windshield. A note on the folding function: it can only be operated below 15 km/h, as the system has anti-misoperation protection. Once, a client complained that the mirrors wouldn't unfold after folding—turned out it was just a blown fuse. In such cases, simply replace it with a 10A fuse.
