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What is a Smart Key Car Key? Differently referred to as keys for proximity, key fobs or remote keys, smart keys are used to unlock doors and start engines without the driver having to insert an actual key. They communicate with each other using radiofrequency signals. Among other things, this helps keep cars secure by stopping hotwiring attempts. Smart keys also broadcast unique encrypted signals to stop them from being used by vehicles of other drivers. Convenience Instead of inserting keys into an ignition slot it is possible to lock and unlock your vehicle by simply pressing the handle on the door or trunk. A majority of modern cars also have a feature which allows you to start your car remotely. This is particularly helpful if you are bringing groceries in, or transporting passengers or equipment. This technology is intended to prevent vehicle theft. Instead of transmitting one frequency signal like a traditional key fob does it sends out several encrypted signals to the car's embedded antennas as you approach it. This prevents other cars from receiving and responding to the same signal, explain how Stuff Works Electronics. Additionally, some companies employ a computer chip inside the vehicle to recognize the unique fingerprint of each key, which makes sure that only authorized drivers use it. This is helpful when you loan your car to friends and family members. Some smart keys also store user preferences, so that seat, mirrors and steering wheel adjustments, as along with stereo presets can be set automatically when the key is within reach of the vehicle. For additional convenience, certain smart keys can be set to stop the vehicle from exceeding a particular speed limit once it has been initiated with that specific key. This can help keep inexperienced drivers safe and can be helpful if you have young children in the back. Security Traditionally, keys were cut from metal to open the ignition. With the advent of smart key technology it is no longer required. Smart keys come with a specific chip that sends signals to your car's antenna. The signal is then detected by the vehicle when the driver presses on the handle on the door or trunk release. It is now impossible to lock the keys in your vehicle. The signal that the smart key transmits to your car is encrypted, which means that only the owner is able to use it. In addition, most models will disable the engine if the vehicle hasn't been started in the last few minutes. This feature is particularly helpful if you are in a risky area or have to leave your vehicle for any reason. In addition, if the smart key battery is depleted during a ride, many systems offer a backup method to open and start the vehicle. The backup method is to insert the key in the slot, or putting it near a particular space in the cockpit which transfers energy to an electric motor. Certain manufacturers also include an key blade that is an emergency mechanical lock in the key which can be used to open the trunk and begin the car if required. Battery Life Most newer cars have keyless entry and push button starting systems, controlled by a smart key fob, which uses proximity technology to communicate with the car. click through the next website on a small transmitter powered by a coin-sized lithium battery. It will eventually need to be replaced, just like any other battery. Although smart key fobs are made to last for several years however, they can suddenly lose power. If the fob battery is dead, you won't be able unlock or start your car holding it close to the front door. It's not uncommon for the transmitter inside the smart key to drain the battery. It sends a signal to the car every time you push an option, but the majority times the smart key is not doing anything. A single signal to lock or unlock takes just a tiny portion of the battery power in the fob which means that there's many years of signals' worth of battery life in an average smart key battery. The fob can also drain the battery if placed in proximity to other devices that emit electromagnetic field like computers and phones. These devices create their own magnetic fields, which can interfere with the fob's own transmitter, causing it to run slower. In certain cases the fob could be unable to function if the fob is left too close to these devices, according to RepairPal. Maintenance Smart keys differ from traditional keys because they use technology to control the security of your vehicle as well as perform other functions. It works by transmitting a signal to antennas located inside and outside your vehicle. These antennas are able to detect the fob's presence and communicate with the car's computer. The car interprets the signal, allowing you to start or close it without having to use the physical key. The fob is now the hub of numerous electronic features found in modern vehicles. The most obvious uses are locking and unlocking your car, remote starting and chirping sound to aid in locating your vehicle in a parking space. Some fobs let you save specific settings for different drivers and remotely open windows and sunroofs. The transmitter itself is a sophisticated device that has an integrated circuit board, and it could be damaged when exposed to heat or cold. The transmitter could be damaged if it is damaged by being dropped or smashed. The battery contacts can be bent. These issues can be difficult to identify and repair. You could try using your phone to bypass the issue and see if that helps however, it's always a good idea to keep a backup key in your pocket just in case. You can purchase a generic replacement for most OEM smart keys, which costs up 70 percent less and comes with a 3-year, higher-quality guarantee than OEM.