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Seat Leon Key Fob Replacement It's not always necessary to replace or reprogram your seat leon remote key fob if it stopped working. It is recommended to first test the battery. You can remove the battery from most fobs by using a small gap, switch, or slider. Make sure you use the same kind of battery as the original. Dead coin battery A battery that's dead is one of the most common reasons for a key fob that isn't working. It is simple to replace, and takes only about a minute. However, you should first confirm that you are using the correct kind of battery. The majority of key fobs use CR2032 3V batteries, which can be found at most electronics stores and online. The owner's manual or YouTube video should contain instructions for opening the key fob, and then replacing its battery. Water Damage Even even if your Leon key fob is water-proof, prolonged exposure to salt water could cause damage to the internal electronic chip that controls the remote. In some instances this can also block the key fob from connecting to the vehicle. You will need to clean it with isopropyl or an electronic cleaner, and dry it before placing the battery back. If the battery is not the issue it could be because the buttons are disaligned or stuck as a result of the use of a lot of them. A good visual inspection should determine if the buttons are damaged or loose, and can be carefully put back together. You can do this yourself, or you can bring the key fob to an auto shop to have it repaired. You may need to replace the remote depending on the degree of the damage. Contacts of the battery may be damaged. A faulty battery contact is one of the most frequent reasons for the keyfob to stop working. This could be due to dirt or water inside the case of the key fob or simply wear and tear over time. Isopropyl Alcohol is a great solvent to clean the contacts of the battery. This will restore the connection between the microprocessor and battery and will allow the key fob to communicate with the vehicle. The battery can be replaced inside your Leon keyfob by pulling the two halves in a way with the flat screwdriver. You can purchase a new battery from any electronics store. Be sure to follow the steps in your owner's manual when taking off and installing the new battery. You can also reset your remote's keyless function by disconnecting the battery for a couple of minutes. This will reset all on-board computers and may restore the ability of your key fob to communicate with your car. If thekeylab persists, you should contact a dealer to reprogram the key. They will use an OBDDII scanner to diagnose the issue and may be able to reprogram your key without needing another original key. The process usually takes in less than an hour. The dealer can also reset the immobilizer. Water damage It's important to take action immediately if the key fob has been submerged in water. Electronics and water don't mix well and could cause damage to the circuit board. A key fob that has been wet may also cease to function. This is why it is essential to repair the issue as quickly as you can. If you accidentally dropped your keyfob in a puddle or pool, or washed it wrongly it is recommended to take it off first and allow it to dry completely. It's also a good idea to find something that will absorb moisture to dry the outer casing and buttons, such as tissue or paper. You can also put it in a bag filled with silica gel packets to help absorb the moisture. Once your key fob has dried completely, it's now time to put it back together. Make sure the battery is properly placed in the circuit, and that the contacts on the circuit are clean. You can apply a small amount of isopropyl-alcohol to clean these areas if you need to. You should be able start your car using the key fob after all this. If it's not working it could be necessary to solve other issues. It could be due to a broken key or a transponder which needs to be reprogrammed. A malfunctioning receiver module It could be time to replace the receiver module if you have tried everything, which includes replacing the batteries, reprogramming and using an extra key fob. It's an electronic part that transmits signals to other modules on the car including the immobilizer. The security system of your car will not work without a functioning receiver module. You won't be able to start your car. If the receiver unit in your seat leon is damaged or not sending appropriate radio frequency signals, you'll notice an error code on the instrument panel. Connecting an OBDII scanner to the vehicle's diagnosis port and examining for problems can often resolve the issue. Then, you can try reprogramming your key with the software provided by your dealer to determine whether it solves the issue. Key fobs have to endure a lot abuse and so they're not a perfect fit for the job. The battery terminal contacts and button are the most frequent failure points. With some effort, it is possible to repair or replace these. If the key fob batteries in your car are low and you want to check the voltage, use an voltage meter. If the battery is showing less than 3 Volts, it is time to replace it. You can get the replacement battery in any auto parts store or electronics center.