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Changing the Battery in Your Mini Key Fob The key fob is an easy way to lock and unlock your car from an extended distance. It also allows you to activate the panic button on your car, which can scare off break-ins. You can repair your device by following a few easy steps. Check that mini car key case is brand new. Then, try taking it from the ignition and pressing the button to lock three times fast. Battery Changing the battery in your key fob is one the most straightforward solutions. The key fob is powered by a tiny coin-shaped 3V battery (CR2032 or CR2025) which is typically easily found in general stores as well as home improvement shops as well as some auto parts stores. Make sure to use a brand new battery -old batteries are usually not useful anymore and could damage the circuit board. Begin by opening the fob. It may be tight, but with the aid of a flat screwdriver, you will be able split the halves. After that, slide the screwdriver in the seam on both sides of the fob to lift a couple of clips to secure it. These can be easily damaged, so be careful and take your time. Reassemble the fob after replacing the battery, and test to see if it works as it should. If it's still not working, try pressing the button a few times and verifying whether the contacts are clean. You could also try the issue with a spare fob to determine if the issue is not specific to the key. If it isn't then there could be a different reason why the key fob isn't working. For instance it could be because the button is worn out. This will only cause the button to work periodically, not continuously. Interference The key fob is powered by a tiny transmitter that sends out a short-range signal to a receiver inside your car. Its goal is to enable your car to recognize the fob, and open its doors when you approach it, as well as start when you push the ignition button within. Interference can occasionally interfere with communication. For example, if you have your second-generation Apple Pencil charged while you're holding the fob, it can prevent you from unlocking the car (via iGeneration). Other electronic devices that use the same frequency as the fob might also interfere with its signal. This includes garage door openers, as well as tire pressure monitoring systems. It is also possible that an RF transmitter inside your home may interfere with the fob's signal though this would be difficult to identify without an expert test. The key fob might require reprogramming. This requires the transmitter in your fob to be recognized by the receiver in your Mini, and a unique code is assigned to each pairing. Fobs typically need to be changed when they're removed or replaced, or when you purchase a replacement and, in some instances it's when a battery has been changed. Follow the instructions in your owner's manual to reprogram a key fob or consult a dealer. Faulty chip Modern electronic key fobs provide convenience and performance over traditional manual keys, but they are also vulnerable to damage. One of the most common issues is a damaged chip that stops your key fob from working properly. Fortunately, this is usually an easy fix. If your car key fob fails to start up, it could be the result of a defective chip. The issue can be fixed by replacing the battery, that is inexpensive and simple to find at a hardware store or big-box retailer. To avoid further problems ensure you buy an appropriate battery for your car model. It is also important to make sure that the fob isn't exposed to water or soapy residue. Water can cause corrosion and disrupt the circuitry. If this is the case, you will require cleaning it with isopropyl alcohol or electronic cleaner prior to installing an entirely new battery. It is a good practice to test the functioning of the fob prior driving the vehicle. Verify the voltage of the new battery with the help of a voltmeter to confirm that it is secure. If not, you could need to replace the entire remote chip. A certified technician from the dealership can help you determine the best solution for your car. Reprogramming We have a brand new replacement slim key fob available to replace your old one, it works exactly the same way as the original key fob. complete fitting instructions are included with each order and we also have a helpline for all of our customers. Sometimes your mini key fob can malfunction or cease to function completely. This is due to many reasons and it can be very frustrating as the car will not start, and you're forced to wait for the car to start again. However, reprogramming the key fob may be the solution and it is easy to accomplish. First, check to see if the battery in your key fob remains good and hasn't been replaced. After a new battery has been installed it cannot be programmed again and will have to be replaced. Once the key fob has been programmed it will then be capable of communicating with the car and control its functions, including radio, air conditioning and even the windows and sunroof. It is also able to activate the comfort access feature that means that the driver's door will be locked and closed automatically when you enter the vehicle and the seats will adjust to allow you in and out. The key fob can then alter the mirrors, the radio, and the climate control settings to your preference.