A modern car is not just a means of transportation, but a complex system where comfort and safety are closely intertwined. One of the key elements of ensuring safety on night trails is the electrochromic mirror. It automatically reduces the brightness of reflection when it hits the light of the headlights behind the cars, preventing the driver from dazzling. This technological solution has long ceased to be the prerogative of premium brands and is available for installation in almost any transport.
The installation process of such a device requires not only accuracy in working with salon plastic, but also basic knowledge in the field of automotive electrics. Incorrect connection can lead to short circuit or failure of the onboard electronics. In this article, we will discuss all the stages in detail: from the selection of the location to the final calibration of the sensors.
The installation will take between one and three hours depending on the model of the car and the experience of the master. It is important to understand that mirrors with auto-darking, often called electrochromic mirrorsThey work on the principle of changing the optical density of a special gel or polymer under the action of an electric current. It is this feature that dictates the need to supply constant voltage to the device.
Before proceeding to disassemble the cabin, you need to make sure that all components are available. The standard set includes the mirror cloth itself with the body, wires are burned, the light sensor (if it is remote) and fasteners. Some models require replacement of the windscreen or part of it, as the installation area can be shaded by factory spraying.
⚠️ Warning: Before starting any work with electrical wiring, be sure to remove the negative terminal from the battery. This will prevent accidental short circuits when laying new power lines.
Selection of equipment and preparation of tools
The first step is to acquire quality rearview. There are many options on the market: from universal models mounted on top of standard glass, to specialized solutions that completely replace the original node. Universal options are easier to install, but often look less aesthetically pleasing. Specialized models require accurate selection for the brand and model of the car.
For a high-quality installation, you will need a certain set of tools. Do not use improvised means, as they can damage the plastic cabin or fasteners. Pay special attention to the tools for working with electricity, since the quality of the wire connection directly affects the durability of the system.
- 🛠️ A set of plastic removers for neat dismantling of the ceiling and racks.
- 🔌 Multimeter to check voltage and find a power connection point.
- ✂️ A set of screwdrivers, bokrez and isolating (preferably fabric).
- 🔦 A flashlight for work in hard-to-reach places under torpedoes and racks.
When choosing a model, note the presence of additional features such as a compass, temperature sensor or Bluetooth module. These options require separate connection and configuration. It is also important to check the compatibility of the attachment: the pitch of the screws and the shape of the leg should correspond to the seat on the windshield.
Some drivers prefer to buy used originals from the showdown. This is a reasonable approach, but requires careful performance testing. electrochromic. Check if there are any bubbles, "faded" spots or cracks on the surface. Recovery of the damaged layer at home is impossible.
Definition of installation location and dismantling of old mirror
Proper positioning of the mirror is critical for the efficient operation of the auto-dimming system. Sensors should have a free view: the front looks forward through the windshield, and the rear - into the car. Cluttering sensors with decorative elements or a tinting strip of glass will lead to incorrect operation.
The process begins with the removal of the mirror. In most cars, it is mounted on a rotary mechanism, which is fixed on a glass plate glued to the windshield. To remove it, you need to turn the case counterclockwise (usually 90 degrees) or snap the decorative plug that hides the screws.
⚠️ Warning: When removing the mirror, be careful not to put excessive effort on the windshield. A sharp jerk can lead to chipping or cracking of glass, especially in the cold season.
If you install a universal mirror, the old one can be left in place, but this will create a “double chin” and worsen the view. It is better to completely dismantle the staff node. After removal, turn off the connectors if wires approached the mirror (for example, to illuminate the cabin or rain sensor).
Check the installation area on the windshield. If this is a factory tinted or ceramic spraying (often found as dots or gradients), the installation of a standard mirror may not be possible without replacing the glass or using special transition plates. In some cases, you need to clean a small area carefully, but this is a risky procedure.
What to do if rain sensors are disturbed?
If the installation area is a block of a rain sensor, often requires the installation of a special shaped mirror with a cutout or the use of an elongated leg. In rare cases, the rain sensor is integrated into the foot of a new mirror.
Laying wiring and finding a power source
The most laborious part of the job is laying wires. The cable must be carried from the place of installation of the mirror down the rack, then under the roof covering and torpedo to the fuse block. Hide the wires as deep as possible so that they do not hang around and do not cause interference when moving.
12V direct current is usually used to connect the power. The source can serve as a block of fuses in the cabin or a wire burn going to the lamplight of the cabin. The second option is easier, as it does not require removal of the torpedo, but requires care when searching for the right contact.
Use a multimeter to find a plus contact where voltage is present all the time, even when the ignition is turned off. This is necessary for the correct operation of the settings memory and, in some models, for the automatic on function when parking. If this is not possible, you can connect to the circuit powered by ignition, but then the mirror will reset the settings.
- 🔍 Find a free pin in the bridge connector or use the "tap" method from the existing wire.
- ⚡ Use a fuse of no more than 5A to protect the new line.
- 🧵 Lay the wire along the regular harnesses, fixing it with plastic clamps.
To connect the wires, use soldering or special crimping connectors. Screws, even well-insulated ones, in the car are a potential source of problems due to vibrations. The connection place must be insulated with thermal shrinkage.
Use a wire with a multicore copper structure in silicone insulation. It is more flexible and resistant to low temperatures than standard PVC wire.
Connection scheme and electrical nuances
A typical electrochromic mirror has three main wires: constant plus (power), plus ignition (on/off control) and mass (minus). In more complex systems, additional wires may be present to transmit a video signal if a screen is built into the mirror, or to communicate with the car's CAN bus.
Connecting to a CAN bus requires the use of a special interface module. This allows the mirror to receive data about the inclusion of rear gear (to turn off auto-darkness when parking) or about the work of wipers. Without such a module, the mirror will operate in base mode, relying only on its light sensors.
Below is a table of standard color markings of wires, which is often found among accessories manufacturers. Always check the specific model instructions, as the standards may vary.
| Function | Typical wire color | Where to plug in | Tension. |
|---|---|---|---|
| Permanent plus. | Red. | Battery / Permanent safety lock | 12B (continuing) |
| Ignition. | Blue/White | Ignition circuit or plafond | 12B (key only) |
| Massa (Earth) | Black. | Body of the car | 0V |
| Backing up | Yellow/Green | Reversing lamp (via relay) | 12B (when R is switched on) |
It is important to ensure reliable grounding. Contact with the body should be cleaned to metal, without paint and rust. Poor "mass" will lead to unstable operation of the dimming system or complete failure of the device.
⚠️ Note: Do not connect the reverse control wire directly to the lamp if it is LED. This can cause an onboard computer error or a flicker of the lamp. Use the relay or connect to the wiring to the light control unit.
Installation of a new mirror and assembly of the salon
After checking the electrical part, you can proceed to the final installation. Apply a special glue for pasting glasses (if required) or install the mirror in a regular place, observing the orientation. Make sure that the wires are not clamped by the fastening mechanism.
Carefully install a plastic casing that hides the wiring and mounting. It should fit tightly to the glass and ceiling, without creating gaps in which dust can accumulate. Then return the rack and ceiling lining to place, carefully snapping all the clips.
Check your visibility. Make sure that the new mirror does not cover critical areas or create blind spots that were not there before. If necessary, adjust the angle of the mounting mechanism.
☑️ Final installation check
Salon assembly complete. Now you need to check the functionality. Turn on the ignition and check if the display on the mirror lights up. Try to close the front light sensor with your hand – the image should darken after a few seconds.
Setup, calibration and troubleshooting
Most modern mirrors do not require complex calibration and operate automatically. However, if the dimming occurs too slowly or, conversely, the mirror turns black during the day, sensitivity adjustment may be required. This is usually done through a hidden menu or a combination of buttons.
A common problem is when the mirror does not return to a transparent state after the ignition is turned off. This may indicate a faulty rear sensor or a problem with wiring the mass. Also check if the sensor is not glued with a sticker or dirt.
If the mirror is flashing or is not working smoothly, check the voltage in the onboard network. The voltage surges may be perceived by the mirror controller as a signal of malfunction. In such cases, the installation of a voltage stabilizer helps.
- 🌑 The mirror doesn’t darken: check the power and integrity of the front sensor.
- ☀️ Mirror dark during the day: check the rear sensor and the purity of the windshield.
- 🔄 Reset: Turn off power for 10-15 minutes to reboot the controller.
The stable operation of auto-dimming depends on the purity of both sensors and the quality of contact of the mass with the car body.
In rare cases, a controller flashing may be required if the mirror supports such a function and is connected to the OBD-II diagnostic connector. This is true for cars with a developed network architecture, where the mirror is part of the overall comfort system.
Frequently Asked Questions (FAQ)
Can I install a mirror with auto-darking, if the car does not have a regular rain sensor?
Yes, you can. The rain sensor and the auto-dimming sensor are different devices. The mirror has its own solar cells and operates autonomously from the rain sensor system, requiring only a connection to the onboard network.
Does the windshield tinting affect the mirror?
Yes, it does. If the tinting film is glued to the area where the front light sensor is located, the mirror will receive less light and may not activate the dimming in time. It is important to leave the sensor area free or use mirrors with sensors removed.
How long does the process of darkening and lightening take?
In quality models, the dimming process takes 2 to 10 seconds depending on the intensity of the light. Lightening (return to a transparent state) occurs faster, usually 20-60 seconds after the disappearance of the bright light source.
Do I need to change the safety lock during installation?
Yes, when connecting a new electric consumer, it is necessary to install a separate fuse in the power chain. This will protect the wiring of the car in the case of a short circuit in the mirror itself or a wire burn.
Will auto-darkness work if I replace the windshield with a non-original one?
It will be if the new glass is transparent in the sensor area. Problems can arise if the glass has too strong a hue (athermal glass with a strong green or blue tint) that distorts the light spectrum perceived by the sensor.