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Seat Leon Key Fob Replacement It may not be necessary to replace or reprogramme your seat leon remote fob if it stopped working. seat exeo key programming is recommended to first test the battery. You can remove the battery from most fobs using a small gap or switch. Make sure you use the same type of battery as the original. Dead coin battery A battery that is dead is among the most common reasons for a key fob not working. The replacement process is simple and takes just few minutes, however the first thing you must do is ensure you're using the right type of battery. The majority of key fobs use CR2032 3V batteries, available at most electronics stores as well as on the internet. The owner's manual or YouTube video will provide the instructions for opening the key fob, and then replacing its battery. Water Damage Even even if your Leon key fob is waterproof, prolonged exposure to salt water could harm the internal electronic chip that controls the remote. In some cases this can also block the key fob from connecting to the vehicle. You'll need to clean it with isopropyl or an electronic cleaner, then dry it before returning the battery. If the battery isn't the problem the buttons may have become misaligned due to constant use. A thorough visual inspection will show if they are loose or damaged, and can be carefully and securely soldered back into place. You could do it yourself, or take the key fob into an auto shop for repair. Depending on the severity of the problem you may have to replace the entire remote. Contacts for the battery that are defective A damaged or defective battery contact is one of the most frequent causes of a keyfob not working. This can be due to dirt or water in the case of your key fob or simple wear and tear. The solution is to clean the battery contacts using isopropyl alcohol. This will restore the connection between the microprocessor and battery and will allow the key fob communicate with the vehicle. You can replace the battery in your Leon key fob by prying open the two halves using a small flat screwdriver and removing the old battery. You can purchase a replacement battery at any electronics store. Be sure to follow the instructions in the owner's manual for taking out and installing the new battery. You can also try resetting your remote keyless system by disconnecting the battery's 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 contact your dealer to reprogram your keys. They will use an OBDDII scanner to diagnose the issue and may be able to reprogram the key without the need for a replacement key. The process is usually completed in less than one hour. The dealer can reset the immobilizer. Water damage It's crucial to act immediately if the key fob has been submerged in water. Water and electronics don't mix well and could damage the circuit board. A key fob that is wet can also stop working. This is why it is crucial to fix the issue as soon as you are able to. If you accidentally dropped your keyfob in the pool or puddle, or washed it by mistake It is best to take it off first and let it dry completely. It's also best to locate something absorbent to dry the outer casing and buttons, like paper towel or tissue. It is also possible to put it in a bag filled with silica gel packs, which can help in removing the moisture. Once your key fob is dried completely, it's now time to put it back together. Make sure the battery is securely inserted and the contacts made of metal on the circuit board are clean. You can use a small amount of alcohol to clean these areas if you need to. After all of this, you should be capable of getting your car to start with the key fob again. If it still won't work, you may need to resolve other issues. It could be due to a broken key or a transponder which requires reprogramming. Faulty receiver module If your key fob was not working after being dropped on the ground or stopped working out of the blue and you've tried everything including replacing the battery, reprogramming it, and even using a spare It could be the time to replace the receiver module. This electronic component sends signals to the other modules in the car, like the immobilizer. Without a working receiver module, your security system of your car won't function and you won't be able to start your car. You'll notice an error on the instrument panel when the receiver module located in the seat leon is damaged or when it's not transmitting radio frequency signals in a proper manner. Connecting an OBDII scanner to the vehicle's diagnostic port and looking for issues can usually resolve the problem. You can then try making a new program using the programmer provided by your dealer to see whether it solves the issue. Key fobs have to endure lots of abuse, so they're not indestructible. The most frequent points of failure are the battery terminal contacts as well as buttons. These are easy to repair and replace with minimal effort. Check the voltage on the key fobs in your car with the help of a voltmeter when they are low. If the battery's voltage is less than 3 Volts it is time to replace it. You can purchase replacement batteries from any electronics store or auto parts center.