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https://www.thekeylab.co.uk/seat-car-keys/ 

If your seat leon key fob stopped working, it may not need to be replaced or reset. The first thing you need to look at is the battery. Most fobs come with an electronic switch, slider or tiny gaps you can use to open and replace the battery. Use the same type of battery as the original.

Dead coin battery

A battery that is dead is among the most frequently cited reasons for a key fob not working. It's not expensive and takes only few minutes, however the first thing you should be sure to make sure you're using the right kind of battery. Most key fobs are equipped with CR2032 3V batteries, which are available in most electronics stores and online. 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, a prolonged exposure to salt water may harm the internal electronic chip that controls the remote. In some instances, this can also prevent the keyfob from communicating with your vehicle. To fix this, you will need to clean the chip with isopropyl alcohol or an electronic cleaner, and then dry it completely prior to replacing the battery.

If it's not the battery that's the issue the buttons may be misaligned as a result of constant use. A thorough visual inspection will identify if they're loose or damaged and should be repaired by soldering them back into place. You can do this yourself or you can take the key fob into an auto shop to be repaired. Depending on the severity of the problem, you might need to replace the entire remote.

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Contacts for the battery that are defective

One of the most common reasons for a key fob that isn't working is because of faulty battery contacts. This could be due to dirt or water in the key fob case or wear and tear over time. Isopropyl alcohol can be used to clean the contacts of the battery. This will restore the connection between the microprocessor and the battery, and will allow the key fob communicate with the vehicle.

You can change the battery on your Leon key fob by prying open the two halves using a small screwdriver with a flat blade and removing the old battery. You can purchase a brand new battery at any electronics retailer. Be sure to follow the steps in the owner's manual for replacing and removing the new battery.

You can also reset the remote by disconnection of the battery for a few minutes. This will reset all the onboard computer components and restore the ability of your key fob to connect with your car. If the problem persists you should consult your dealer to reprogram your keys. They will employ an OBDII scanner in order to determine the problem and may be able to reprogram your key fob, without the need for an original key. This process is usually completed within less than a half hour. The dealer can also reset the immobilizer.

Water damage

It's important to take action immediately if your key fob has been submerged in water. Water and electronics don't mix well and can damage the circuit board. A key fob that is wet can also stop working. This is why it is crucial to fix the problem as soon as you can.

If you accidentally dropped your keyfob into the pool or puddle, or washed it in error It is best to remove the battery first, and allow it to dry completely. It's also recommended to find something absorbent to dry the outer casing and buttons, like tissue or a paper towel. You can also try placing it in a bag that contains silica gel packets, which helps to absorb moisture.

Once your key fob's completely dry, it's the time to start putting it back together. Make sure that the battery is securely inserted and the metal contacts on the circuit board are clean. You could use a small amount of isopropyl alcohol to clean these areas if needed.

It should be possible to start your car with the fob of your key after all this. If it's not working, you may need to resolve other issues. It could be a malfunctioning key or transponder that requires reprogramming.

Receiver module that is defective

It may be time to replace your receiver module if you have tried everything, including replacing the batteries, reprogramming and using an extra key fob. This electronic component sends signals to other modules in the car, like the immobilizer. The security system on your car will not work without a receiver module that is functioning. You won't be able start your vehicle.

You'll notice an error on the instrument panel If the receiver module within the seat leon is damaged, or if it's not transmitting radio frequency signals in a proper manner. In most instances, the issue will be solved by connecting an OBDII scanner to the vehicle's diagnostic port and examining it for issues. You can then try changing your key's programming using the programer provided by your dealer to determine if it fixes the problem.

Key fobs take a lot of abuse, so they aren't indestructible. The battery terminal contacts and button are the most frequent failure points. With some effort, you can easily repair or replace these. If the batteries for your key fob in your car aren't functioning properly, check the voltage with the aid of a voltmeter. If the battery's reading falls lower than 3 Volts is it time to replace it. You can find the replacement battery in any electronic store or auto parts center.