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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 is a handy way to unlock the doors and get started the car. There are a variety of reasons why the fob won't work. This includes a dead coin-battery or water damage, issues with the receiver module, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to search for local locksmiths for automotive locksmiths). Includes trunk, lock and unlock buttons. Dead Coin Battery The most frequent reason that your 500 key fob doesn't function is due to a dead battery. Modern key fobs come with a restricted operating range, and must be within only a few feet from the vehicle in order to function. If you are far from your vehicle and press the keyfob button, it will not respond and display the message “Key Fob Not Detected”. If this happens, replace the battery on your coin cell (Part number CR2032) by a new one from a reputable brand like Panasonic, Duracell, or Energizer. You can find them in your local hardware store or online. You can test the battery of your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switches. If the fob's key doesn't work after replacing the battery, it might have water damage that stops it from communicating with the receiver module inside your car. Water damage can happen through a variety of methods, including a simple splash or submerging the key fob saltwater at the beach. If you suspect your fob was exposed to water, try putting it in a dry rice bag to draw the moisture out. If this fails, you'll require your fob to be reset by an auto locksmith or dealer. Water Damage Damage to the water supply can occur if you submerge the fob in the ocean, or wash it in a washing machine. Saltwater can be particularly harmful to the circuit board of the fob, causing it to short out and eventually die. If you get the fob wet, it's not an ideal idea but if you accidentally drop it into the water in a cup or do not remember to take it out of your pocket before you run the washer, don't give up hope. First take the battery off the fob. Before replacing the battery clean the electronic chip using isopropyl or similar products. Test the fob afterward to check if it's working. If the key doesn't work, it may have to be reset. This is usually handled by a professional or dealer auto locksmith. If the key is a newer model and has not been programmed to your car It is likely that it needs to be replaced completely. This is a straightforward process that can be completed by a professional locksmith for automotive use. The locksmith will need to cut the key to match the ignition on your vehicle. The locksmith also needs to reprogram the fob into the car's system. spare key for fiat 500 's a simple and cost-effective procedure which can be completed within the same day. Receiver Module Issues Your 500 key fob might not work because it's out of range. The remote's range is of 30 feet. Therefore, in the event that you are far away from your vehicle it won't be able to respond to your commands. It's easy to solve this issue by moving the remote closer to your car until it responds. If your fob won't work after you replace the battery in the coin, also known as a “button”, “watch” or “button” it may be due to a malfunction on the circuit board inside. In most cases, reprogramming the fob will solve the problem. There are instructions on how to do this for most vehicles by searching YouTube or reading the owner's manual. You may have to replace the metal retaining clips that keep the battery of your coin in place. If they lose tension, it could prevent the battery from being properly seated and cause your remote to malfunction. In rare cases it is possible that the fob will become desync'd with your vehicle due to software issues or hardware issues. It is possible to fix this issue by visiting your local auto-locksmith or dealer to reprogram your key fob. In some cases, they may need to reinstall the software on your body control module as well. Interference Interference can also cause the key fob to not receive or transmit a signal. This is possible when the key fob is located near an electronic radio transmitter (cell phones, radar detectors) or another source of electromagnetic radiation. The key fob might not work due to a bad connection to the buttons water damage or damage to the internal chips. If the key fob has suddenly stopped working, out of the blue and you've tried everything you can do at home to resolve it e.g. replacing the battery, reprogramming it and using the spare key fob, you could have a faulty 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 converts them to electronic commands that the vehicle interprets. Fortunately, there's an easy method to reset all of the onboard systems in your 500 device, including the key fob. Disconnect the battery 12 volt for approximately 15 minutes by taking off the negative cable first then the positive cable. Reconnect the battery. This will erase any remaining electricity, and restart the computer of your car. This will help you get your key fob to work again. If the problem persists you should speak with an expert certified technician. They can identify the root cause of your problems.