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Changing the Battery in Your Mini Key Fob The key fob allows you to lock and unlock your vehicle from a distance. It also allows you to activate the panic button on your car that can deter burglaries. You can repair your fob by following few simple steps. Check that the battery is new. Then, remove it from the ignition by pressing the button to lock three times quickly. Battery Change the battery in your key fob is one of the most straightforward solutions. The key fob is powered by a tiny coin-shaped 3V battery (CR2032 or CR2025) that is usually available in general stores, home improvement shops, and a few auto parts stores. Make sure to use a new battery. Batteries that are old can damage the circuit boards and are no longer useful. You'll want to start by opening the fob. It may be a bit tight, but with the aid of a flat screwdriver you should be able separate the two halves. Then, insert the screwdriver in the edges of the fob and lift a couple of clips to secure it. They are easily broken so proceed slowly and with care. After replacing the battery, reassemble the fob and check to see if everything is working according to plan. If it still doesn't work you can try pressing the button a few times before confirming that the contacts are clear. You can also test the fob with a spare to determine if the issue is specific to your key. If not the case, there could be another reason for why your key fob isn't functioning. It could be due to a worn button, for example. This could cause the button to work at times, not always. Interference The key fob is powered by a small transmitter that transmits the signal in a short distance to a receiver inside your car. Its goal is to enable your car to recognize the fob, and open its doors when you come close to it, as well as start when you press the ignition button in. The problem is, interference can sometimes interfere with the transmission. If you charge your second-generation Apple Pencil while holding the fob (via iGeneration) it may prevent you from unlocking the vehicle. Other electronic devices that utilize the same frequency as the fob could interfere with the signal. Garage door openers or tire-pressure monitoring devices could be affected. Even a transmitter in your home could be causing interference however it is not easy for a professional to test. It's also possible that the key fob just needs to be modified. This process requires the transmitter on the fob to be recognized by the receiver in your Mini and a unique code is assigned to each pairing. The fob needs to be programmed after they have been disconnected or replaced after you buy a new one and in some cases when the battery is changed. Follow the instructions in the owner's manual for how to reprogram a key fob or ask a dealer for assistance. Chip that is not working Modern electronic key fobs provide convenience and function over traditional manual keys, but they can also be more susceptible to being damaged. A damaged chip is one of the most frequent issues that could stop your key fob from operating properly. Fortunately, this is often an easy fix. If your fob is constantly not turning on your car, it is a sign that the chip is faulty. The problem can usually be resolved by replacing the battery, which is cheap and easy to find at a hardware store or big-box retailer. To avoid future problems ensure you buy the right battery with your car model. The fob should also not be exposed to water, or soapy residue. Water will often cause corrosion, which can cause problems with the circuit board. If this is the case, you will need to clean it by using isopropyl or electronic cleaner prior to installing the new battery. It is a good practice to test the operation of the fob prior to operating the vehicle. Utilizing a voltmeter, examine the voltage of the new battery to see if it is at a safe level. If not, you may require replacing the entire remote chip. A certified technician from a dealer can help determine the best solution for you vehicle. Reprogramming We have a replacement slim key fob to replace the old key fob. It functions exactly as the original one, and full fitting instructions come with every order. We also provide a customer helpline. Often, the mini key fob will begin to malfunction or cease to function completely. This can be due to numerous reasons, and it can be very frustrating as the car will not start and you'll have to wait for a while until you can drive again. However, reprogramming the key fob could be the answer and is simple to accomplish. First, check that the battery in the key fob is in good condition and has not been replaced. Once a new key fob battery has been installed, it can't be reprogrammed. key mini will need to be replaced. Once the key fob is programmed, it will be capable of communicating with the car and control its functions including the air conditioning, radio and even the windows and sunroof. It also has the ability to activate comfort access. This means the driver's doors will open and close automatically as you enter the car or the seats move to help you get into and out. The key fob can then adjust the mirrors, the radio, and the climate control settings to suit your preference.