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seat car key coverIf your seat Leon key fob has stopped working, it is not required to be replaced or reset. You must first examine the battery. Most fobs come with an adjustment switch, slider or small gaps that you can utilize to pry open and replace the battery. Make sure to use the same type of battery as the original.Dead coin batteryOne of the most common causes of a key fob that stops functioning is a dead battery. It is easy to replace, and takes only less than a few minutes. However, you must first make sure that you are using the correct kind of battery. Most key fobs are powered by CR2032 batteries (3V) that 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 DamageEven even if the Leon key fob has an waterproof coating, prolonged exposure to saltwater could damage the electronic chip inside the remote. In some cases, this could also prevent the keyfob from communicating with your vehicle. It is necessary to clean the battery with isopropyl or an electronic cleaner, and dry it before returning the battery.If the battery isn't the issue, it could be that the buttons are unbalanced or stuck because of many hours of use. If they are loose or damaged you can easily solder them back into place. You can try this yourself or send the key fob to an auto shop for repair. Depending on the severity of the problem, you might need to replace the entire remote.Faulty battery contactsA faulty battery contact is among the most common reasons for a keyfob not working. It could be due to water or dirt inside the case of your key fob or just wear and tear. The solution is to clean the battery's contacts with isopropyl alcohol. This will restore communication between the microprocessor, the battery and the key fob.The battery can be replaced inside your Leon keyfob simply by tearing the two halves apart with a screwdriver that is flat. A new battery is inexpensive and can be purchased at any electronics store. Follow the directions in the owner's handbook when taking the old battery out and installing the new one.You can also reset the remote by disconnection of the battery for a couple of minutes. This will reset all the on-board computers and might help restore your key's ability to communicate with the vehicle. If the problem persists you should speak to your dealer to reprogram your keys. They will employ an OBDDII scanner in order to determine your problem and may be able reprogram your key without the need for a new key. The process is usually completed in less than one hour. The dealer can also reset the immobilizer.Water damageIf your key fob was soaked in water, it's important to act quickly. Electronics and water aren't an ideal mix and could cause damage to the circuit board. A key fob that has been wet is also prone to cease to function which is why it's important to deal with this issue as soon as possible.If you accidentally dropped your keyfob into water or a pool, or washed it by mistake then you must take it off first and let it dry completely. It's also an ideal idea to find something that will absorb moisture to dry the casing and buttons, like tissue or a paper towel. You can also put it in a bag filled with silica gel packets to help absorb the moisture.Once your key fob has completely dried, it's 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 isopropyl-alcohol to clean these areas if needed.You should be able to start your vehicle using the key fob after all this. However, if it won't start the vehicle, there may be other issues that need to be taken care of. It could be due to a broken key or a transponder that must be reprogrammed.Receiver module that is defectiveIt's time to replace the receiver module if you have tried everything, including replacing the batteries, reprogramming or using an extra key fob. It's an electronic part that transmits signals to other modules in the car, such as the immobilizer. Without a functioning receiver module, the security system of your car won't function, and you won't be able to start your vehicle.If the receiver unit in your seat leon is damaged or isn't sending appropriate radio frequency signals, you'll notice an error code on the instrument panel. In most cases, the problem can be solved by connecting an OBDII scanner to the vehicle's diagnostic port and checking for issues. Try to re-programme your key using the key programmer supplied by your dealer to see whether it solves the issue.Key fobs are subjected to a lot abuse and so they're not completely safe. The battery terminal contacts and button are the most frequently encountered failure points. With a little effort, you are able to repair or replace these. If the key fob batteries in your car aren't working, check the voltage with the help of a voltage meter. If the battery's reading is lower than 3 Volts the time is now to replace it. You can get an alternative battery at any electronics store or auto parts center.