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Seat Leon Key Fob Replacement If your seat leon key fob has stopped working, it is not required to be replaced or changed in programming. The first thing to look at is the battery. You can pry the battery out of many fobs using a tiny gap, switch, or slider. Make sure to use the same type of battery as the original. Dead coin battery One of the most common causes of a key fob that stops functioning is an inoperative battery. The replacement process is simple and takes only a few minutes, but the first thing you must be sure to make sure you're using the right kind of battery. Most key fobs are powered by CR2032 batteries (3V) which are available in a majority of electronic stores or on the internet. You can find information on how to open the key fob or replace its battery in your owner's manual, YouTube video, or other online resources. Water Damage Even if your Leon key fob is waterproof, a prolonged exposure to salt water can cause damage to the internal electronic chip that controls the remote. In some instances it could also prevent the key fob from connecting to the vehicle. You will need to clean the battery with isopropyl or an electronic cleaner, and then dry it prior to placing the battery back. If you don't think the battery is the issue, the buttons could have become misaligned due to the constant use. If they're loose or damaged, you can carefully solder them back into their original position. You can do this yourself or bring the key fob in to an auto shop to be repaired. Depending on Recommended Looking at of the issue it may be necessary to replace the entire remote. Faulty battery contacts A damaged battery contact is one of the most common reasons for the key fob to not work. This could be due to dirt or water in the case of your key fob or simply wear and wear and tear. The solution is to clean the battery's contacts using isopropyl alcohol. This will restore the connection between the microprocessor and battery and will allow the key fob communicate with the vehicle. The battery can be changed inside your Leon keyfob by pulling the two halves apart with an angled screwdriver. You can buy a new battery from any electronics retailer. Be sure to adhere to the directions in the user's manual of your device when taking off and installing the new battery. You could also try resetting your remote keyless system using the battery with 12 volts for a few minutes. This will reboot all the on-board computers and may help restore your key's ability to communicate with your vehicle. If the issue continues, you should call your dealer to reprogram your keys. They will use an OBDII scanner to diagnose the issue and may be capable of reprogramming your key fob without the need to purchase an additional key. This process is usually completed within less than a half hour. The dealer can reset the immobilizer. Water damage It's crucial to act quickly if your key fob is submerged in water. Water and electronics aren't an ideal match and could cause damage to the circuit board. A key fob that's wet will also stop working and that's why it's so important to deal with this issue as quickly as you can. If you accidentally dropped your key fob in the water or puddle or even put it in the wash accidentally the first thing you need to do is to remove the battery and allow it to dry completely. It's also a good idea to find something that will absorb moisture to dry the outer casing and buttons, such as tissue or paper. You can also put it in a bag with silica gel to help absorb moisture. Once your key fob has become completely dry, it's time to put it back together. Make sure that the battery is properly inserted and the metal contacts on the circuit board are clean. You can apply a small amount of isopropyl alcohol to clean these areas if necessary. After all this you should be able to get your car to start with the key fob. If it doesn't work, you may need to resolve other issues. These could include a damaged key or a transponder that needs to be reprogrammed. The receiver module is not working properly. It's probably time to replace the receiver module if you have tried everything, including replacing the batteries, reprogramming and using a spare key fob. The electronic component transmits signals to the other components in the car, such as the immobilizer. Without a functioning receiver module, your car's security system won't work, and you won't be able to start your vehicle. There will be an error on the instrument panel when the receiver module located in the seat leon is damaged or if it's not transmitting radio frequency signals properly. Connecting an OBDII scanner to the vehicle's diagnosis port and examining for errors will usually solve the issue. Then you can reprogramme the key using a dealer-supplied programmer and see if that resolves your problem. Key fobs are exposed to a lot abuse and so they're not impervious to destruction. The most frequent points of failure are the battery terminal contacts as well as buttons. They are easy to fix and replace with a little effort. If the key fob batteries in your car are not working test the voltage using an voltage meter. If the battery's reading is less than 3 Volts it is time to replace it. You can buy a replacement battery from any electronics store or auto part center.