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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 makes it simple to open doors and start your vehicle. However, there are a variety of reasons why the key fob might stop functioning. This could be due to a dead coin-battery and water damage, as well as problems with receiver modules, as well as interference. This listing is for a NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It must be professionally programmed (click here to find local locksmiths for your vehicle). It includes trunk, lock and unlock buttons. Dead Coin Battery The most frequent reason why your 500 key fob won't function is due to the battery is dead. Modern key fobs have a very limited operating range, and should be within some feet of the car to operate. If you are far from your vehicle when you press the key fob button the car will not respond, and will display the “Key Fob Not Detected” message in the instrument cluster. If this happens, simply replace the battery in the coin cell (Part number CR2032) by a new one from a reputable brand such as Panasonic, Duracell, or Energizer. They can be found in the local hardware store or online. After you've replaced the battery in the coin cell It is possible to test it by standing near your Fiat 500 and pressing the buttons. The car will flash its parking lights and the key fob should operate the lock and unlock buttons. If your fob's key does not work after replacing the battery, it might be water damage that hinders it from connecting to the module in your vehicle. Water damage can happen in many ways, including a simple splash or submerging the key fob in saltwater at the beach. If you suspect that your fob has been exposed to water, try placing it in a dry rice bag to pull the moisture back out. If this isn't working, you'll have to get your fob reset by an auto locksmith or dealer. Water Damage Water damage can occur when you immerse the fob in the ocean, or wash it in a washer. Saltwater is particularly dangerous to the circuit board of the fob which causes it to short out and eventually end up dying. The fob getting wet is not a good idea but if you accidentally drop it into a cup of water or forget to remove it from your pants pocket prior to running the washing machine Don't give up hope. First, remove the battery from the fob. Before replacing the battery, clean the electronic chip using isopropyl, or a similar product. Next test the fob to check if it functions. If the fob doesn't work, it may have to be reset. This is usually done by a professional or dealer auto locksmith. If your key is old and is not programmed for your vehicle You will need to replace it completely. This is an easy process that can be completed by a professional automotive locksmith. The locksmith will need the key to be cut to match your car's ignition. The locksmith will also have to reprogram your fob in the vehicle's system. This is a cost-effective and quick process that could be completed in the same day. Receiver Module Issues One of the main reasons why your 500 key fob might stop functioning is that it's out of range. The remote typically has a range of 30 feet or less, and if it's too far away from your car it will not respond to your commands. You can remedy this by moving your remote closer to your car until it responds. If you've replaced your coin battery (commonly known as a “button” or “watch”) and the fob won't work it could be due to an internal circuit board issue. In most cases, reprogramming the fob will resolve this issue. There are instructions on how to do this for all vehicles by searching YouTube or reading the owner's manual. It is possible to replace the metal clips that hold the battery of your coin in place. If they lose tension it can prevent the coin battery from being properly seated and cause your remote to malfunction. In rare instances, the fob may become desync'd with your vehicle due to software problems or hardware issues. how much is a new fiat 500 key could be a huge headache, but you can usually fix it by visiting an auto locksmith to have them reprogram your fob for you. In some cases they might need to reinstall the software in your body control module, as well. Interference Interference can also cause the key fob to not receive or transmit a signal. This could happen when the keyfob is located in close proximity to a radio transmitter, such as a cell phone or radar detector. Other reasons the key fob might not work may be a lack of connection to the buttons or the internal chip, or water damage. If your key fob suddenly stopped working, or you have tried everything at home to fix it (e.g. replacing batteries, reprogramming or using the spare key fob, you could have a defective receiver module on your 500. The receiver module is situated under the dash and picks up the radio frequency signals from the key fob. It transforms the signals into electronic commands which are then interpreted by the vehicle. There's a simple method to reset the 500's internal system, including the keyfob. Disconnect the battery 12 volt for about 15 minutes, by removing the negative cable and then the positive cable. Then reconnect the battery. This will eliminate any remaining electric current, and also restart the computer in your car. This will help you get your key fob to function again. If the issue persists, you should speak with an expert technician. They'll be able to diagnose the exact cause of your problems.