seat key replacement
If your seat Leon key fob has stopped working, it's not necessary to be replaced or reprogrammed. The first thing to examine is the battery. Most fobs have an electronic switch, slider or small gaps that you can use to remove and replace the battery. Make sure to use the same kind of battery as the original.
Dead coin battery
One of the most common causes of a key fob that stops functioning is a dead battery. It is easy to replace and takes just some minutes. But, you must first ensure that you are using the correct type of battery. Most key fobs are powered by CR2032 batteries (3V) and are available in a majority of electronic 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 resources.
Water Damage
Even if the Leon key fob has a waterproof coating, long-term exposure to saltwater could damage the electronic chip in the remote. In some cases this can hinder the keyfob's communicating with your vehicle. You will need to clean it with isopropyl or an electronic cleaner, then dry it prior to placing the battery back.
If the battery is not the issue, it could be that the buttons are disaligned or stuck as a result of frequent use. If they are loose or damaged you can use a soldering iron to gently secure them back into their original position. You can attempt this yourself or take the key fob to an auto shop for repair. Depending on the severity of the issue you may have to replace the entire remote.
Contacts for the battery that are defective
One of the most frequent reasons for a key fob that isn't working is due to damaged battery contacts. It could be due to water or dirt in the case of your key fob, or just wear and tear. The solution is to clean the battery's contacts with isopropyl alcohol. This will restore the connection between the microprocessor's battery and the battery. This will allow the key fob to communicate with the vehicle.
You can change the battery on your Leon key fob by opening the two halves using an abrasive screwdriver that is small and then removing the battery. A new battery is not expensive and can be purchased at any electronics retailer. Be sure to follow the directions in the owner's guideline when taking out and installing the new battery.
You can also reset the remote's keyless by disconnecting its battery for a few minutes. This will reset all on-board computers and may restore the ability of your key fob to communicate with the car. If the issue continues, you should contact your dealer to reprogram your keys. They will employ an OBDDII scaner to pinpoint the issue and might be able to reprogram your key without the need to purchase a new key. The process is usually completed in less than one hour. The dealer can also reset the immobilizer.
Water damage
If your key fob was submerged in water, you need to act quickly. Water and electronics don't work well and can damage the circuit board. A key fob that has been wet may also cease to function. This is why it is essential to address the issue as soon as you are able to.
If you accidentally dropped your keyfob into water or a pool, or washed it by mistake then you must remove the battery first and let it dry completely. You can also use a paper towel or tissue to dry the casing. You could also put it in a bag that contains silica gel packets, which will help to suck out water.
Once your key fob has become completely dry, it's time to put it back together. Make sure the battery is securely inserted and that the contacts made of metal on the circuit board are clean. You can try a small amount of isopropyl ethanol to clean these areas if you need to.
It should be possible to start your car with the fob of your key after all this. If it still won't work it could be necessary to fix other issues. This could be a broken key or transponder that needs to be reprogrammed.
Faulty receiver module
It's time to replace your receiver module if have tried everything from replacing the batteries, reprogramming or using an extra key fob. It's an electronic component that sends signals to other modules in the car including the immobilizer. Without a working receiver module, your security system of your car won't function and you won't be able to start your vehicle.
You'll see an error 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 diagnosis port and checking for any errors will usually solve the problem. Then you can reprogramme the key using a dealer-supplied programmer and see if it solves your issue.
Key fobs can be subjected to some abuse, and therefore they're not completely safe. The most common points of failure are the battery terminal contacts as well as buttons. These are easy to repair and replace with minimal effort. Check the voltage of your car's key fobs with a voltmeter if they are low. If the battery's reading is less than 3 Volts is it time to replace it. You can find the replacement battery in any electronic store or auto parts center.