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How to Fix G28 That Stops Working It can be frustrating if your key fob stops working. There are a few options you can use to resolve the issue. It is easy to fix the key fob not working by replacing the coin battery. Some issues, however, may require more advanced troubleshooting. Dead coin battery If your key fob suddenly stopped working, it could be due to a dead battery in the coin-cell. It's easy and affordable to replace the battery. Your owner's guide will give you the instructions. Many electronic stores and local car dealerships carry replacement batteries. Make sure that the batteries you purchase are of the same voltage and size as the original ones. If you replace a defective battery or a different one, the chip in the key fob could be damaged. Make sure the clips are made of metal and secure the batteries. They should be tight and not rusted or worn. They are typically made from spring steel. The battery can move around in the event that they lose tension. This could lead to problems with contact. In this instance the keyfob may not respond when the remote controls transmit signals. Damage from water signals interference and other issues with the receiver module could cause the key fob to stop functioning. If none of these solutions work, you should look into replacing the remote key fob. You can also try using faraday pouches, which will shield the key fob from external electromagnetic fields. If the key fob still does not work after these solutions, you should go to your dealer for a reprogram of the remote key fob. The cost of this service can vary according to the make and model of your car. Water damage Depending on how often you use your seatleon keyfobs, they can last anywhere between two and four year before it needs to be replaced. Water damage can be the cause for a remote that suddenly stops working. This type of damage can occur when the key is opened or dropped, and it can also cause corrosion to the circuit board. It is possible to reprogramme the key in order to restore functionality. However it is best to leave this to professional auto technicians. The key fob has rubber seals to prevent water from contacting the electronic chip inside, however prolonged exposure to salty, soapy or ocean water may damage it. The exposure to any kind of water can cause the key fob's electronics to fail, even when the chips aren't damaged. The key fob buttons can sometimes be soldered. However, this might not work in all instances especially if they're squeezed or pulled away from the hard. If the key fob is submerged in water, remove the battery first and then clean with isopropyl the the circuit board. After thoroughly drying it then, put it back in place. If the key fob still does not work Try using a different remote to reset the system. You could also try disconnecting the battery with 12 volts for a few minutes. Unplug the negative cable before the positive. Radio interference If the key fob that is connected to your seat leon stops working, it can be frustrating and even dangerous. Key fob problems are usually caused by a dead battery, but other causes can affect signal transmission. This could be due to a damaged antenna or a key which is not paired and requires to be changed. You can resolve some of these issues by removing additional transmitters from the key ring and examining the key fob in an area that is not cluttered with interference. Try to reboot the on-board computer by removing the 12 volt battery for a few minutes before reconnecting it. If this does not fix the issue, it could be necessary to replace the battery. Another reason that can cause key fob issues is interference from add-on accessories, such as LED lights. They can interfere with radio frequency signal utilized by the key fob to communicate with the microprocessors in the car. Daily Mail reports that these devices are sold for as little at PS100. They are simple to use. These devices are used to fool proximity-sensing systems of keyless entry to think that a key is right by. This kind of attack is typically in vehicles with internet connectivity. It is crucial to be aware and take precautions. Keyless entry system that isn't working properly While a key fob is an amazing convenience, it can be annoying when it stops working. Fortunately, the majority problems that can cause a car's key fob to stop responding can be easily solved. Examine the battery first. Most of the time, replacing the batteries on your key fob can get it working again. It may also have to be reset or programmed. Look up the owner's guide for specific instructions. Another common issue with a key fob is radio interference. This is often caused by objects in close proximity to your vehicle, weather conditions, and other transmitters operating on the same frequency as your key fob. If you're experiencing this issue, consider shifting your key fob to an area that is free of other transmitters. If your key fob still does not work after changing batteries and refitting it there's a chance that the key has been damaged. If the fob was dropped or has been exposed to water, this can happen. If your key is damaged, you can buy new ones from a reputable service center or take it to locksmiths to have it programmed for your vehicle. Be sure to use only authentic BMW fob. It is possible to have more issues in the future. It's a smart idea to always have an extra keyfob.