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Seat Leon Key Fob Replacement It may not be required to replace or reprogramme your seat leon remote key fob if it has stopped working. You must first examine the battery. Most fobs feature switches, sliders or a small gaps that you can use to remove and replace the battery. Use the same type battery as the original. Dead coin battery One of the most common causes of a key fob that stops working is an inoperative battery. Replacing it is inexpensive and takes just a few minutes, but the first thing to be sure to make sure you're using the right type of battery. Most key fobs use CR2032 3V batteries, which are sold at most electronics stores and on the internet. You can find the instructions on how to open the key fob and replace the battery in the owner's manual, YouTube video, or other online sources. Water Damage Even even if the Leon key fob has a waterproof coating, prolonged exposure to saltwater may damage the electronic chip inside the remote. In some cases, this may also prevent the key fob from connecting to the vehicle. It is necessary to clean the battery with isopropyl or an electronic cleaner, then dry it before returning the battery. If the battery isn't the problem, the buttons could have become misaligned from frequent use. If they're loose or damaged, you can repair them by carefully soldering them back in place. You can do this yourself or you can take the key fob in to an auto shop for repair. Depending on the severity of the issue you may have to replace the entire remote. Contacts to the battery are not working properly. A damaged battery contact is one of the most common causes for the key fob to not work. This could be due to dirt or water inside the case of the key fob or simply wear and tear over time. Isopropyl Alcohol can be used to clean the battery's contacts. This will restore communication between the microprocessor, battery, and the key fob. The battery can be replaced inside your Leon keyfob by prying the two halves in a way with an angled screwdriver. A new battery is inexpensive and can be purchased from any electronics retailer. Be sure to adhere to the directions in the owner's manual for taking off and installing the new battery. You could also try resetting your remote keyless system by disconnecting the 12 volt battery for a short period of time. This will reset all the onboard computers and may bring back the ability of your key fob to communicate with your car. If seat key persists then you should seek out an expert to reprogram your key. They will use an OBDII scan tool to pinpoint the issue and may be in a position to reprogram your key fob without the need for another key. The process is usually completed in less than a hour. The dealer can also reset the immobilizer. Water damage If your key fob was submerged in water, it's imperative to act quickly. Electronics and water aren't a good mix and can cause damage to the circuit board. A key fob that has been wet may also stop working. This is why it is essential to repair the issue as soon as you are able to. If you accidentally dropped your keyfob into an aquisition or pool or washed it by mistake then you must remove the battery first, and allow it to dry completely. You can also use a paper towel or tissue to dry the outer casing. It is also possible to put it in a bag that contains silica gel packets, which can help in removing moisture. Once your key fob's completely dry, it's time to start putting it back together. Make sure the battery is properly inserted and the metal contacts on the circuit board are clean. You can apply a small amount of alcohol to cleanse these areas if required. After all this you should be capable of getting your car to start using the key fob again. If it still isn't able to start, there may be other issues that need to be addressed. It could be due to a broken key or a transponder that requires reprogramming. A malfunctioning receiver module It's 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, like the immobilizer. The security system on your car won't work without a functioning receiver module. You won't even be able to begin your vehicle. If the receiver module in your seat leon is damaged or isn't sending the correct radio frequency signals, you'll see an error message on the instrument panel. Connecting an OBDII scanner to the vehicle's diagnosis port and looking for issues can usually resolve the problem. Then you can try reprogramming the key using a dealer's programmer and see if that resolves your problem. Key fobs take lots of abuse, so they aren't indestructible. The battery terminal contacts as well as the button are the most frequent failure points. With some effort, you can easily repair or replace these. If the key fob batteries in your car aren't working then check the voltage using the aid of a voltage meter. If the battery's reading is lower than 3 Volts is it time to replace it. You can find the replacement battery in any auto parts store or electronics center.