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Seat Leon Key Fob Replacement It may not be necessary to replace or reprogramme your seat leon remote key fob if it has stopped working. It is recommended to first test the battery. Most fobs have switches, sliders or a small gap you can use to open and replace the battery. Make sure you use the same kind of battery as the original. Dead coin battery One of the most frequent causes of the key fob not functioning is an inoperative battery. Replacing it is easy and takes just a few minutes, but the first thing you should do is make sure you're using the right kind of battery. The majority of key fobs use CR2032 3V batteries, which are available at most electronics stores as well as online. You can find information on how to open the key fob or replace its battery in your owner's manual, YouTube video, or other online resources. Water Damage Even even if your Leon key fob is waterproof, a prolonged exposure to salt water can cause damage to the internal electronic chip that controls the remote. In some cases this can hinder the keyfob's communicating with your vehicle. To fix this you'll need to clean the chip with alcohol or an electronic cleaner and dry it completely before placing the battery back. If the battery isn't the issue it could be because the buttons have become unbalanced or stuck because of frequent use. A visual inspection can show if they are damaged or loose, and can be carefully soldered back in place. You can do this yourself or you can take the key fob into an auto shop to have it repaired. It may be necessary to replace the remote based on the degree of the damage. Contacts for the battery that are defective One of the most common reasons for a key fob not working is because of faulty battery contacts. It could be due to water or dirt getting into the case of your keyfob, or simply wear and tear. The solution is to clean the battery contacts using isopropyl alcohol. This will restore communication between the microprocessor, the battery and the key fob. You can change the battery on your Leon key fob by opening the two halves using the help of a small screwdriver, and removing the old battery. You can purchase a brand new battery from any electronics retailer. Make sure you follow the instructions in the owner's guideline when removing and installing the new battery. You can also reset the remote's keyless function by disconnecting the battery for a few minutes. This will reset all the onboard computers and may help to restore the capability of your key fob to connect with your car. If the issue continues you should consult an expert to reprogram your key. They will use an OBDDII scanner to diagnose your problem and may be able to reprogram your key without the need for a replacement key. This process will usually be completed in less than one hour. The dealer can also reset the immobilizer. Water damage It's important to take action quickly if your key fob has been submerged in water. Water and electronics are not an ideal mix and could cause damage to the circuit board. A key fob that is wet will also cease to function. This is why it's important to fix the problem as soon as you can. If you accidentally dropped your keyfob in water or a pool, or washed it by mistake It is best to remove the battery first and allow it to dry completely. You can also use paper towel or tissue to dry the outer casing. You can also try putting it in a bag that contains silica gel packets, which can help in removing water. Once your key fob has completely dried, it's time to put it back together. Make sure that the battery is securely inserted and that the metal contacts on the circuit board are clean. You could use a small amount of isopropyl alcohol to clean these areas if you need to. After all of this, you should be in a position to get your car to start with the key fob again. If it still won't work it is possible that you need to solve other issues. These could include a broken key or a transponder which needs to be reprogrammed. Receiver module that is defective If your key fob isn't working after you dropped it on the floor or suddenly stopped working out of blue and you've tried everything else including replacing the battery, reprogramming, and even using a spare fob It could be the time to replace the receiver module. The electronic component transmits signals to the other components in the car, including the immobilizer. The security system on your car will not work without a functioning receiver module. Read the Full Report won't be able to begin your vehicle. If the receiver module within your seat leon is damaged or not transmitting appropriate radio frequency signals, you'll see an error code on the instrument panel. Connecting an OBDII scanner to the vehicle's diagnostic port and examining it for problems can often resolve the problem. Try making a new program using the programer provided by your dealer to see if it fixes the problem. Key fobs endure many abuses They aren't impervious to damage, which is why they're not completely safe. The most common points of failure are the battery terminal contacts and buttons. They are simple to fix and replace with minimal effort. If the batteries for your key fob in your car are low then check the voltage using the help of a Voltmeter. If the battery is showing less than 3 Volts, it is time to replace it. You can find an alternative battery at any auto parts store or electronics center.