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Seat Leon Key Fob Replacement It's not always necessary to replace or reprogramme your seat leon remote fob if it has stopped working. You should first check the battery. Most fobs have a slider, switch or tiny gaps you can use to pry open and replace the battery. Make sure you use the same type of battery as the original. Dead coin battery One of the most common reasons for the key fob not functioning is a dead battery. Replacing it is easy and takes only few minutes, however the first thing to do is ensure you're using a suitable type of battery. Most key fobs use CR2032 3V batteries, which are available at most electronics stores and on the internet. You can find the instructions on how to open the key fob and replace the battery in the owner's manual, YouTube video, or other online sources. Water Damage Even even if your Leon key fob is waterproof, prolonged exposure to saltwater can harm the internal electronic chip that controls the remote. In some instances this could also stop the key fob from communicating with your vehicle. To resolve this issue you'll need to clean the chip using alcohol or an electronic cleaner and then dry it completely before placing the battery back. If the battery isn't the issue it could be that the buttons have become unbalanced or stuck because of a lot of use. A careful visual inspection will reveal if they are damaged or loose and should be soldered back in place. You can do this yourself, or you can take the key fob in to an auto shop for repair. Depending on the severity of the problem you may have to replace the entire remote. Contacts to the battery are not working properly. A faulty battery contact is among the most frequent causes of a keyfob not working. This could be due dirt or water in the case of your key fob or simple wear and wear and tear. Isopropyl alcohol can be used to clean the contacts of the battery. This will restore communication between the microprocessor, the battery, and the key fob. The battery can be replaced in your Leon keyfob by prying the two halves of the keyfob apart with a screwdriver that is flat. A new battery is affordable and can be purchased from any electronics retailer. Be sure to adhere to the directions in the owner's manual for taking out and installing the new battery. You could try resetting the remote keyless system using the 12 volt battery for a few minutes. This will reset all the onboard computers and may restore the ability of your key fob to communicate with the car. If the problem persists, you should contact an expert to reprogram your key. They will employ an OBDII scanner in order to determine the issue and may be able to reprogram your key fob without the need for an original key. This process is usually completed in less than an hour. The dealer will also be able to reset the immobilizer. Water damage If your key fob was soaked in water, it's crucial to act fast. Water and electronics don't get along well and can cause damage to the circuit board. A wet key fob will also cease to function. This is why it is important to address the issue as promptly as you can. If you accidentally dropped your keyfob in water or a pool, or washed it in error then you must take it off first and let it dry completely. G28 Car Keys can also use a paper towel or tissue to dry the casing. You can also place it in a bag with silica gel bags to aid in the absorption of the moisture. 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. If necessary, use a little isopropyl clean the contacts. After this, you should be capable of getting your car to start using the key fob again. However, if it won't start the vehicle it could be due to other issues that need to addressed. These could include a broken key or a transponder which requires reprogramming. Receiver module that is defective It may be time to replace the receiver module if you have tried everything, which includes replacing the batteries, reprogramming or using a spare key fob. This is an electronic device that sends signals to other components on the car including the immobilizer. The security system in your vehicle will not function without a receiver module that is functioning. You won't even be able to start your vehicle. If the receiver module within your seat leon is damaged or not sending the correct radio frequency signals, you'll see an error message on the instrument panel. Connecting an OBDII scanner to the vehicle's diagnostic port and checking for any problems can often resolve the problem. Then, you can try to re-programme your key using the software provided by your dealer to determine if it fixes the problem. Key fobs endure quite a beating, so they aren't indestructible. The most common points of failure are the battery terminal contacts and buttons. They can be repaired and replace with little effort. If the batteries for your key fob in your car aren't working then check the voltage using an voltage meter. If the battery reads less than 3 Volts then it's time to replace it. You can locate a replacement battery at any electronics store or auto parts center.