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Seat Leon Key Fob Replacement It is not necessary to replace or change the programming of your seat remote fob, if it stopped working. The first thing to be looking for is the battery. You can pry the battery out of most fobs with a tiny gap, switch, or slider. Use thekeylab.co.uk as the original. Dead coin battery A battery that's dead is one of the most frequent reasons for a key fob to stop working. The replacement process is simple and takes only some minutes, but the first thing you must be sure to make sure you're using the correct type of battery. The majority of key fobs are powered by CR2032 batteries (3V) that can be found in most electronics stores, or online. Your owner's manual, or a YouTube video should give you the steps to open the key fob and re-installing its battery. Water Damage Even even if your Leon key fob is waterproof, prolonged exposure to salt water can damage the internal electronic chip that controls the remote. In some instances this could also stop the key fob from communicating with your vehicle. It is necessary to clean the battery with isopropyl or an electronic cleaner, and then dry it before placing the battery back. If you don't think the battery is the issue, the buttons could be misaligned because of constant use. If they're loose or damaged, you can carefully solder them back into place. You can try this yourself or take the key fob to an auto repair shop for repair. Depending on the severity of the problem it may be necessary to replace the entire remote. Contacts to the battery are not working properly. One of the most common reasons for a key fob that isn't functioning is due to defective battery contacts. This can be caused by dirt or water in the case for the key fob or simply wear and tear that happens over time. The solution is to clean the battery's contacts with isopropyl alcohol. This will restore the communication between the microprocessor, battery, and the key fob. The battery can be changed within your Leon keyfob by tearing the two halves of the keyfob apart with a flat screwdriver. A new battery is affordable and can be purchased from any electronics store. Be sure to follow the directions in the user's manual of your device when taking out and installing the new battery. You could also try resetting the remote keyless system by disconnecting the battery's 12 volts for a few minutes. This will allow you to reboot all on-board computers and might allow your key fob to communicate with your vehicle. If the issue continues then you should seek out a dealer to reprogram the key. They will utilize an OBDII scanner to identify the issue and could be in a position to reprogram your key fob without the need for another original key. The process is usually completed in less than a hour. The dealer can also reset the immobilizer. Water damage It's crucial to act quickly if your key fob is submerged in water. Water and electronics are not a good mix and can cause damage to the circuit board. A key fob that is wet will also stop working. This is why it is crucial to address the issue as soon as you are able to. If you accidentally dropped your keyfob in water or a pool, or washed it accidentally it is recommended to remove the battery first, and allow it to dry completely. It's also an ideal idea to find something that will absorb moisture to dry the outer casing and buttons, like tissue or paper. You can also try placing it in a bag containing silica gel bags, which helps to absorb the moisture. Once your key fob's completely dry, it's time to put it back together. Make sure that the battery is properly inserted, and that the contacts on the circuit are clean. If necessary, use a little isopropyl to clean the contacts. After all that, you should be in a position to get your car to start using the key fob. If it's not working then you might need to address other problems. This could be a broken key or transponder that requires reprogramming. Faulty receiver module It could be time to replace your receiver if you tried everything, such as replacing the batteries, reprogramming and using an extra key fob. The electronic component transmits signals to the other components in the car, like the immobilizer. The security system in your car will not work without a functioning receiver module. You won't even be able to start your vehicle. If the receiver unit in your seat leon is damaged or doesn't transmit the correct radio frequency signals, you'll be able to see an error code on the instrument panel. In many instances, the issue can be solved by connecting an OBDII scanner to the diagnostic port of your vehicle and examining for any errors. Then you can reprogramme the key with a dealer-provided programmer and see if it solves the issue. Key fobs can take lots of abuse but they're not impervious to destruction. The battery terminal contacts and button are among the most frequent failure points. These are easy to repair and replace with little effort. Examine the voltage of your car's key fobs by using a voltmeter if they are low. If the battery is showing less than 3 Volts it is time to replace it. You can find the replacement battery in any electronics store or auto parts center.