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Seat Leon Key Fob Replacement If your seat Leon key fob is not working, it might not need to be replaced or reprogrammed. The first thing to be looking for is the battery. It is possible to pry the battery from many fobs with a tiny gap or switch. Make sure you use the same type of battery as the original. Dead coin battery A battery that's dead is one of the most common reasons for a key fob not working. The replacement process is simple and takes just some minutes, but the first thing you should ensure that you're using the correct type of battery. The majority of key fobs are powered by CR2032 batteries (3V) which can be found in most electronics stores or online. You can find the instructions on how to open the key fob and replace its battery in your owner's manual, YouTube video, or other online resources. Water Damage Even if your Leon key fob is waterproof, prolonged exposure to salt water can damage the internal electronic chip that controls the remote. In certain cases it could also prevent the key fob from communicating with your vehicle. It is necessary to clean the battery with isopropyl or an electronic cleaner, then dry it prior to putting the battery back. If the battery isn't the problem, the buttons could be misaligned because of the constant use. If they are loose or damaged you can use a soldering iron to gently secure them back in place. You can try this yourself or bring the key fob in to an auto shop for repair. Depending on the severity of the problem it may be necessary to replace the entire remote. Contacts for the battery that are defective One of the most frequent reasons for a key fob not working is because of faulty battery contacts. It could be due to dirt or water in the case of your keyfob, 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 the battery, and will allow the key fob to communicate with the vehicle. You can change the battery on your Leon key fob by opening the two halves using a small flat screwdriver and then removing the old battery. A new battery is inexpensive and can be purchased from any electronics store. Make sure you follow the steps in the owner's guideline when replacing and removing the new battery. You can also reset the remote keyless by disconnecting the battery for a couple of minutes. This will allow you to reboot all computer on board and may bring back the ability of your key fob to connect to the vehicle. If the issue continues it is recommended that you contact an expert to reprogram your key. They will employ an OBDII scanner to identify the problem and may be able to reprogram your key fob without needing an additional key. This procedure is typically completed within less than a half hour. The dealer will also be able to reset the immobilizer. Water damage If your key fob has been soaked in water, it's important to act swiftly. Water and electronics are not an ideal combination and could cause damage to the circuit board. A key fob that is wet can also stop working. This is why it is essential to repair the issue as soon as you can. If you accidentally dropped your key fob into the water or puddle or even thrown it into the washing machine accidentally The first thing to do is to remove the battery and let it dry out completely. You can also use paper towel or tissue to dry the casing. You can also try putting it in a bag that contains silica gel packets, which will aid in removing moisture. When your key fob is completely dry, it's the time to put it back together. Make seat keys that the battery is securely in place, and that the contacts on the circuit are clean. You can try a small amount of isopropyl alcohol to cleanse these areas if required. You should be able to start your car using the key fob after all this. If it doesn't work, you may need to fix other issues. This could be due to a damaged key or a transponder that needs to be reprogrammed. The receiver module is not working properly. It may be time to replace the receiver module if you have tried everything from replacing the batteries, reprogramming or using a spare key fob. This is an electronic component that transmits signals to other modules in the car like the immobilizer. Without a working receiver module, your security system on your car will not function, and you won't be able to start your car. You'll notice an error on the instrument panel when the receiver module inside the seat leon is damaged, or in the event that it isn't transmitting radio frequency signals properly. Connecting an OBDII scanner to the vehicle's diagnosis port and examining for errors will usually solve the problem. You can then try to re-programme your key using the programmer provided by your dealer to determine whether it solves the issue. Key fobs can take lots of abuse, so they aren't indestructible. The battery terminal contacts as well as the button are among the most frequent failure points. These are easy to repair and replace with only a little effort. Verify the voltage of your car's key fobs using the aid of a voltmeter, if they're low. If the battery reads less than 3 Volts, it's time to replace it. You can find the replacement battery in any electronics store or auto parts center.