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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 car. There are a myriad of reasons the key fob might stop working. This could be due to a dead coin-battery water damage, problems with receiver modules, as well as interference. This listing is for a NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It must be professionally programmed (click here to search for local locksmiths for your vehicle). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason why the 500 key fob won't function is due to a dead battery. Modern key fobs have a limited range of operation and must be within a few inches of the vehicle to function. If you are far from your vehicle and you press the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this occurs you need to replace the battery of your coin-cell (Part Number CR2032) by a brand new one of a reputable brand such as Panasonic Duracell or Energizer. They are available at your local hardware store or online. After you've replaced the coin cell battery You can test it by standing in front of your Fiat 500 and pressing the buttons. The car will blink its parking lights and the key fob will operate the lock and unlock switches. If the key fob won't work after replacing the battery, it might have water damage that prevents it from connecting to the receiver module inside your vehicle. Water damage can happen in a number of ways, from an accidental splash to submerging your fob in salt water at the beach. If you suspect that your fob has been exposed to water, try putting it in a dry rice bag to pull the moisture back out. If this doesn't work your fob may need to be reset by a professional auto locksmith or by the dealer. Water Damage Damage to the water supply can occur if you submerge the fob in the ocean, or wash it in a machine. Saltwater can be particularly harmful to the fob's circuit board and can cause it to short out and eventually die. If you get the fob wet, it's not an ideal choice but if you drop it in an empty cup of water, or fail to remove it from your pocket before you run the washing machine do not give up hope. Take the battery off first. Before replacing the battery, clean the electronic chip using isopropyl or similar products. Check the fob to verify if it's working. If the key doesn't work, it may need to be reset. This is usually done by a dealer or professional auto locksmith. If the key is newer and was not programmed to your vehicle It will most likely need to be replaced completely. This is a simple process that can be carried out by a professional automotive locksmith. The locksmith will have to cut the key to match the ignition on your vehicle. They'll also have to reprogram the fob in the system of your car. This is an affordable and quick process that could be completed the same day. Receiver Module Issues Your 500 key fob might be inoperable because it's out of range. The remote's range is of 30 feet, so should you be too far away from your vehicle it will not respond to your commands. You can fix this by moving the remote closer to your vehicle until it responds. If you've replaced the battery on your coin (commonly known as”button” or “button” or “watch”) and your fob doesn't function, it could have an internal circuit board problem. In the majority of cases, reprogramming your fob will fix the issue. You can find instructions on how to do this for all automobiles by searching YouTube or consulting the owner's manual. fiat 500 key fob replacement may need to replace the metal retaining clips that keep the coin battery. If they lose tension, it can prevent your coin battery from being properly seated and cause your remote to malfunction. In rare cases the fob could be desync'd with your vehicle due to software or hardware issues. You can fix this problem by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain instances they may have to install the software again in your body control module too. Interference Interference can also cause the key fob to not receive or transmit the signal. This could occur if the key fob is located near the radio transmitter (cell phones or radar detectors) or another source of electromagnetic radiation. Other reasons the key fob may not function include a weak connection to the buttons or damage to the internal chip or water damage. If the key fob been unable to function for a while without notice or even after trying every option at home to solve it e.g. You may have a faulty 500 receiver module if you've tried replacing the battery, reprogramming it, or using a spare key fob. The receiver module is situated under the dash, and it picks up the radio frequency signals from the key fob. It converts them into electronic commands that the vehicle interprets. There's a simple method to reset the 500's onboard system including the keyfob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Reconnect the battery. This will remove any remaining electric current, and also restart the computer of your car. This could help you get your key fob working again. If the issue persists, you should seek out an expert technician. They'll be able determine the root of your problems.