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Seat Leon Key Fob Replacement If your seat Leon key fob has stopped working, it might not need to be replaced or reset. The first thing you should check is the battery. The majority of fobs have an electronic switch, slider or tiny gaps you can use to pry open and replace the battery. Make sure to use same type of battery that was used in the original. Dead coin battery One of the most common causes of a key fob that stops working is a dead battery. The replacement process is simple and takes only about a minute, but the first thing to ensure that you're using the correct type of battery. Most key fobs use CR2032 3V batteries, which are sold in most electronics stores and on the internet. The owner's guide or YouTube video will provide the instructions for opening the key fob, and then replacing its battery. Water Damage Even if your Leon key fob is water-proof, prolonged exposure to salt water can harm the internal electronic chip that controls the remote. In some instances, this can also prevent the keyfob from communicating with your vehicle. To resolve this issue you'll need to clean the chip using alcohol or an electronic cleaner. then dry it completely before placing the battery back. If it's not the battery that's the issue the buttons may be misaligned because of constant use. A thorough visual inspection will show if they are loose or damaged and then soldered back in place. You can attempt this yourself or take the key fob to an auto repair shop for repair. It may be necessary to replace the remote depending on the degree of the issue. Contacts of the battery may be damaged. One of the most common reasons for a key fob not working is due to faulty battery contacts. This could be due water or dirt getting into the case of your key fob, or just wear and wear and tear. Isopropyl Alcohol is a great solvent to clean the battery's contacts. This will restore the connection between the microprocessor and battery and will enable the key fob to communicate with the vehicle. You can change the battery inside your Leon key fob by prying open the two halves using an abrasive screwdriver that is small and then removing the old battery. You can purchase a new battery at any electronics retailer. Follow the directions in the owner's guide when taking the old battery out and installing the new one. You can also reset the remote keyless by disconnecting the battery for a few minutes. This will reboot all the on-board computers and may help restore your key's ability to connect to the vehicle. If the problem persists, you should contact an authorized dealer to reprogram your key. They will utilize an OBDII scan tool to pinpoint the issue and might be able to reprogram your key fob without the need to purchase an additional key. The process usually takes in less than an hour. The dealer can reset the immobilizer. Water damage If your key fob was soaked in water, it's imperative to act fast. Water and electronics aren't an ideal match and could cause damage to the circuit board. A key fob that has been wet could also cause it to stop working, which is why it's so important to take care of this issue as soon as possible. If seat key cover dropped your keyfob in an aquisition or pool or washed it by mistake it is recommended to remove the battery first, and let it dry completely. You can also use a paper towel or tissue to dry the outer casing. You can also put it in a bag with silica gel bags to aid in the absorption of moisture. Once your key fob is been completely dry, it's time to put it back together. Make sure that the battery is properly placed in the circuit, and that the contacts on the circuit are clean. If necessary, you can apply a bit of isopropyl clean the contacts. You should be able to start your car with the fob of your key after all this. If it doesn't work it is possible that you need to solve other issues. It could be due to a broken key, or a transponder that needs to be reprogrammed. Receiver module that is defective It could be time to replace your receiver module if have tried everything, including replacing the batteries, reprogramming, and using a spare key fob. The electronic component transmits signals to the other modules inside the car, like the immobilizer. Without a functioning receiver module, your security system in your car won't work and you won't be able start your car. There's a problem on the instrument panel when the receiver module inside the seat leon is damaged, or if it's not sending radio frequency signals properly. Connecting an OBDII scanner to the vehicle's diagnostic port and looking for errors can often solve the problem. Then you can try reprogramming the key using a dealer-supplied programmer to see if this resolves your problem. Key fobs are subject to many abuses but they're not impervious to destruction. The most common points of failure are the battery terminal contacts as well as buttons. They are easy to fix and replace with little effort. If the batteries for your key fob in your car aren't functioning properly, check the voltage with a Voltmeter. If the battery's reading falls lower than 3 Volts is it time to replace it. You can buy an alternative battery from any electronic store or auto part center.