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How to Fix a Seat Leon Key Fob That Stops Working The key fob is a great feature in your car seat but it can be a hassle when it isn't working. There are a few things you can do to resolve the issue. It is simple to fix a key fob that is not working by replacing the battery. Other issues could require more complex troubleshooting, however. Dead coin battery If your key fob suddenly stopped working it could be due to a dead coin-cell. Changing the battery is inexpensive and easy. The instructions are in your owner's manual. The majority of electronic stores and local auto dealerships offer replacement batteries. The replacement batteries must be the same size and power as the originals. The chip in your key fob could be damaged when you replace the battery incorrectly, or with an alternative type. It's also important to inspect the retaining clips made of metal that hold the battery in place. These clips must be in good condition and not worn out or rusted. They are typically made of spring steel. seat leon key fob may move in the event that they lose tension. This could cause contact issues. In this instance the keyfob may not respond when the remote control transmits signals. Water damage or signal interference as well as other issues with the receiver module may cause the key fob to stop working. If none of these solutions work you need to replace the remote key fob. You can also try using faraday pouches that will shield the key fob from external electromagnetic fields. If the key fob stops working after these fixes you must consult your dealer about reprogramming the remote key fob. The cost will differ based on the make and model. Water damage Based on the frequency with which your seat key fob from Leon is used, it could last between two and four years before requiring replacement. If the remote stops functioning suddenly, the reason may be water damage. This type of damage may be caused when the remote is opened or stepped upon and may also cause corrosion to the circuit board. It is possible to reprogramme the key in order to restore function. However this should be left to auto technicians who are trained professionals. The rubber seals on the key fob prevent water from getting into the electronic chip, but prolonged exposure could damage it. Any type of water can cause the key fob's electronics to fail even if the chips are not damaged. In some instances the buttons of the key fob can be resoldered, however this will not always work particularly when the buttons are pressed or pulled with force. If the key fob is submerged, take it off first and then clean with isopropyl the the circuit board. Then, dry it completely before reinstalling the battery. If the key fob does not work then try using a spare remote to reset the system. You can also disconnect the battery 12 volts for a few seconds. Unplug the negative cable before the positive. Radio interference It can be a hassle and even dangerous, if the key fob on your seat leon ceases to function. A dead battery is generally the most common reason for key fob issues, however there are also other causes that could affect the transmission of signals. This can be caused by a damaged antenna or a key that is not paired and needs to be changed. It is possible to fix some of these issues by removing any transmitters that are not needed from your key ring and then testing the key fob in a location that is not cluttered with interference. You can also try to restart the computer that is on your key fob by removing the 12 volt battery for a couple of minutes before reconnecting it. If this doesn't fix the issue, you might require replacing the battery. Accessories that are added on, such as LED lighting could also trigger problems with the key fob. They can interfere with the signals from RF that are used by the keyfob to communicate with microprocessors in cars. Daily Mail reports that these devices are sold for as little at PS100. They are simple to use. These devices are used to trick proximity-sensing systems of keyless entry into believing that a key is just by. This kind of attack is mostly in vehicles that have internet access. It is essential to be aware and take precautions. A malfunctioning keyless entry system A key fob is an excellent convenience, but it can also be a hassle when it stops working. The majority of the issues that result in the key fob of your car to stop working can be solved. First, check the battery. Sometimes, just replacing the batteries in your key fob will get it working again. It might need to be reset or programmed. Check the owner's manual for instructions on how to do this. Another issue with a key fob is radio interference. This is often caused by objects in close proximity to your vehicle or weather conditions as well as other transmitters operating on the same frequency as your key fob. If you're experiencing this issue try moving your key fob or attempting to operate it in areas that don't have other transmitters in the vicinity. If your key fob still doesn't work after changing the batteries and refitting it there's a good chance that the key is damaged. If the fob has been dropped or has been exposed to water it could happen. If your key is damaged you can purchase a replacement from an authorised service center or take it to your local locksmith to have it programmed to your vehicle. Be sure to use only genuine BMW fob. In the event that you don't, you could run into further problems down the line. To avoid this, it's a good idea carry an extra key fob with you at all times.