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How to Fix a Seat Leon Key Fob That Stops Working The key fob is a wonderful convenience in your seat however it can be a hassle when it isn't working. There are a few steps you can do to fix the issue. Often, the issue with your key fob is usually a worn-out battery that you can replace in just a few minutes. Certain issues may require more extensive troubleshooting. Dead coin battery If your key fob suddenly stopped working, it could be due to a dead battery for the coin-cell. It's cheap and easy to change the battery. The owner's manual will give you the instructions. Most electronic stores and local car dealerships carry batteries for replacement. The replacement batteries must be the same size and voltage like the original ones. If you replace a defective battery or a different one the chip inside the key fob could be damaged. Check the metal clips that are used to hold the batteries. These clips must be in good condition, and not rusted or worn. They are typically made of spring steel. If they lose tension, the battery can move around and cause contact problems. In this case the keyfob won't respond when the remote control transmits signals. Damage to the water, signal interference and other issues with the receiver module may cause the key fob to stop working. If none of the above solutions work then it's time to replace the remote key fob. You can also put it in the faraday bag to shield the key fob against electromagnetic fields from outside. If the key fob fails to function after these fixes, you should visit your dealer to reprogram the remote key fob. The cost will depend on your vehicle's make and model. Water damage Depending on how frequently your seat leon key fob is used, it will last between two and four years before requiring replacement. If your remote stops working abruptly, the reason could be water damage. This type of damage can occur if the key is opened or was stepped on, and could also cause corrosion to the circuit board. The key can also be reprogrammed to restore the functionality, but this procedure should be left for professional auto technicians. The rubber seals on the key fob prevent water from getting to the chip's electronic components, but long-term exposure to water can harm it. Even if the chip is not damaged, exposure to any type water can cause the electronics of the key fob to fail. In certain situations the buttons on the key fob can be resoldered, however this is not always the case particularly if the buttons are pressed or pulled on hard. If the key fob was submerged in water, you must first remove the battery and scrub the contacts on the circuit board using isopropyl alcohol. Then, dry it completely before reinstalling battery. If the key fob still does not work you can try using a spare remote to reset the system. You can also remove the 12 volt battery for a few minutes. Be sure to disconnect the negative cable first before you disconnect the positive cable. Radio interference It can be a hassle and even risky, if the key fob that you have on your seat leon fails to function properly. A dead battery is the most frequent cause for key fob issues, however there are many other reasons that can interfere with the transmission of signals. This could be due to an antenna that is damaged or a key which is not paired and has to be changed. Remove any transmitters that are not on the key ring and test your key fob in a location which isn't prone to interference. You can also try to reboot the on-board computer by removing the 12 volt battery for a couple of minutes and then reconnecting it. If seat key fob replacement doesn't fix the issue, it might be necessary to replace the battery. Another reason that can cause key fob problems is interference from accessories like LED lights. They can interfere with radio frequency signal utilized by the key fob to communicate with the microprocessors in the car. Daily Mail reports that these devices are available for as low as PS100. They are also simple to use. These hacking devices are used to trick proximity-sensing systems of keyless entry into believing that a key is just to. This kind of attack is most often in cars with internet access. It's important to be aware of these risks and take precautions. Keyless entry systems that aren't working properly A key fob is an excellent convenience, but it can also be a hassle when it stops working. The majority of problems that result in the key fob of your car to cease working can be solved. First, make sure the battery is in good condition. In most cases, replacing the batteries in your key fob will make it work again. It may also have to be reset or programmed. Look up the owner's guide for instructions. Radio interference is a common issue with key fobs. This can be caused by objects near your vehicle and weather conditions. It can also be caused by other transmitters operating on the same frequency as your key fob. If you're experiencing this problem try moving your key fob, or trying to operate it in areas where there aren't any other transmitters around. If your key fob does not function after changing the batteries or reprogramming, it's likely that the key has been damaged. If the fob was dropped or exposed to water or exposed to water, this could happen. If your key has been damaged you can purchase replacement parts from an authorized service center or take it to your local locksmith to have it programmed to your vehicle. Be sure to use only authentic BMW fob. Otherwise, you could run into more issues later on. To avoid this, it's a good idea keep a spare key fob with you at all times.