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Changing the Battery in Your Mini Key Fob The key fob is a convenient way to lock and unlock your car from some distance. It can also activate your vehicle's panic button that can stop burglaries. If your fob stops working you can fix it by following a few simple steps. Check that the battery is brand new. Remove the battery from the ignition and then press the lock button quickly three times. Battery The battery you use in your key fob is one of the most straightforward fixes. The key fob is powered by a small coin-shaped battery (CR2032 or and CR2025) that can be found in most general stores or home improvement stores and auto parts stores. Be sure to use the latest battery- old batteries are often no longer good for anything and could cause damage to the circuit board. You'll want to start by opening the fob. It may be necessary to employ a flat screwdriver in order to split the two halves. Place the screwdriver through the seams on both sides of the fob and lift the clips that secure it. They are very easily broken therefore, take your time and work slowly. After replacing the battery, reassemble the fob and check to see if everything is functioning exactly as it should. If it doesn't work after pressing the button multiple times, make sure that the contacts are clean. You can also test the issue with a spare fob to see if the problem is confined to your key. If not it could be another reason why the key fob isn't working. It could be due to a worn button, for example. This will only make the button work infrequently and not all the time. Interference The key fob uses a small transmitter to send a short-range radio signal to a receiver within your car. Its purpose is to allow your car to recognize the fob and then open its doors when you are near it and start when you press the ignition button in. The issue is that interference can sometimes hinder the communication. For instance, if you have your second-generation Apple Pencil charged while you're holding the fob, it could prevent you from unlocking the car (via iGeneration). Other electronic devices operating at the same frequency can also interfere with the fob's signal. This could include garage door openers and tire-pressure monitoring systems. Even a transmitter in your home could be causing interference however this isn't easy for a professional to test. It's possible that your fob needs to be reset. The transmitter on the fob you have purchased must be recognized by Mini's receiver. A unique code is then used for each pairing. Fobs must be reprogrammed after they have been disconnected or replaced, after you purchase a new one and in certain cases when the battery is changed. Follow the instructions in the owner's manual for how to reprogram your key fob or consult a dealer. Chip that isn't working Modern electronic key fobs offer greater convenience and efficiency than traditional manual keys. However, they are also more prone to damage. One of the most common issues is a damaged chip that stops the fob from functioning properly. This is usually a simple fix. If your fob is continually not turning on your car, this is a sign that the chip has become defective. The problem can usually be repaired by replacing the battery that is inexpensive and simple to locate at an hardware store or big-box retailer. Make sure you buy an alternative battery that is compatible with the model of your vehicle to avoid any further problems. The fob should also not be exposed to water, or soapy residue. Water can cause corrosion and damage the circuitry. If this is the situation you'll have to clean the board with isopropyl or an electronic cleaner prior to installing an entirely new battery. It is a good idea to test the function of the fob prior driving the vehicle. Test the voltage of the new battery using the help of a voltmeter to confirm that it's safe. If not then you may need to replace the entire remote chip. A certified technician from a dealer can help determine the best solution for you vehicle. Reprogramming We have a slim key fob replacement to replace the old one. mini cooper s key works exactly the same way as the original key fob, full fitting instructions are provided with each order and we also have a helpline for all customers. Often, your mini-key fob will begin to malfunction or stop working completely. This is due to various reasons and it can be very stressful as the car will not start, and you'll need to wait for a long time until you can drive again. Reprogramming the keyfob is a straightforward solution. The first step is to ensure that the battery in the key fob is in good condition and has not been replaced. After a new battery has been installed, it can't be programmed again and will require a replacement. Once the key fob is programmed, it will be capable of communicating with the vehicle and control all its functions including the radio, air conditioning and even the sunroof and windows. It also has the ability to activate comfort access, which means the doors for the driver will open and close automatically when you enter the vehicle or that the seats move to assist you in getting in and out. The key fob can then adjust the mirrors, the radio, and the climate control settings to your preference.