Seat Leon Key Fob Replacement It might not be necessary to replace or change the programming of your seat leon remote key fob if it has stopped working The first thing you should look at is the battery You can pull the battery from most fobs using a small gap or switch Use the same type battery as the original Dead coin battery A dead battery is among the most frequently cited reasons for a key fob to stop working Replacing it is easy and takes just a few minutes, but the first thing you must ensure that you're using the right type of battery Most key fobs are powered by CR2032 batteries 3V which can be found in most electronics stores or 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 if the Leon key fob has a waterproof coating, long-term exposure to saltwater may damage the electronic chip within the remote In certain cases, this may also prevent the key fob from communicating with the vehicle To resolve this issue you'll need to clean the chip with isopropyl alcohol or an electronic cleaner then dry it completely prior putting back the battery If the battery is not the problem it could be because the buttons have become unbalanced or stuck because of frequent use If they are damaged or loose, you can use a soldering iron to gently secure them back into place You can do this yourself or take the key fob to an auto shop for repair https//wwwthekeylabcouk/seat-car-keys/ may have to replace the remote based on the degree of the issue Contacts for the battery that are defective One of the most common reasons for a key fob to stop working is because of faulty battery contacts This could be due water or dirt inside the case of your key fob or simple wear and wear and The solution is to clean the battery contacts with isopropyl alcohol This will restore the communication between the microprocessor, the battery, and the key fob The battery can be replaced in your Leon keyfob by tearing the two halves in a way with the flat screwdriver A new battery is inexpensive and can be purchased at any electronics retailer Make sure you follow the directions in the user's manual of your device when replacing and removing the new battery You could try resetting the remote keyless system by disconnecting the 12 volt battery for a few minutes This will allow you to reboot all on-board computers, and could help restore your key's ability to connect with your vehicle If the problem persists you should consult a dealer to reprogram your key They will use an OBDDII scanner to identify your issue and could be able to reprogram your keys without the need for a replacement key The process is usually completed 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 soaked by water Water and electronics don't get along well and can damage the circuit board A key fob that's wet is also prone to not function properly this is why it's crucial to address this issue as quickly as possible If you accidentally dropped your key fob in the water or puddle or even thrown it into the wash accidentally The first thing you need to do is remove the battery and let it dry completely You can also use paper towel or tissue to dry the casing You can also try putting it in a bag with silica gel bags, which helps to absorb the moisture Once your key fob has become completely dry, it's time to start putting it back together Make sure the battery is securely installed, and that all contacts on the circuit are clean You can try a small amount of isopropyl-alcohol to clean these areas if necessary After all of this you should be successful in getting your vehicle to start by using the key fob again If it still won't work, you may need to fix other issues This could be a broken key or transponder that needs to be reset Receiver module that is defective If your key fob was not functioning after dropping it on the floor or simply was not working out of blue and you've tried everything else, including replacing the battery, reprogramming it, and using a spare key fob it could be time to replace the receiver module It's an electronic component that transmits signals to other components on the car, such as the immobilizer Without a functioning receiver module, your security system of your car won't function and you won't be able start your car You'll see an error on the instrument panel if the receiver module in the seat leon is damaged, or if it's not transmitting radio frequency signals properly Connecting an OBDII scanner to the vehicle's diagnostic port and looking for issues can usually resolve the problem Then, you can try changing your key's programming using the software provided by your dealer to see whether it solves the issue Key fobs can take a lot of abuse They aren't impervious to damage, which is why they're not completely safe The battery terminal contacts as well as the button are the most frequently encountered failure points With a little effort, it is possible to repair or replace these Check the voltage on your car's key fobs by using a voltmeter if they are low If the battery's voltage is less than 3 Volts it is time to replace it You can find a replacement battery at any electronic store or auto parts center