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Reasons Your Fiat 500 Key Fob Won't Work A key fob for Fiat 500 makes it simple to open doors and start your vehicle. There are a myriad of reasons why the key fob might stop functioning. This includes a dead coin-battery and water damage, as well as problems with the receiver modules, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It needs to be professionally programmed (click here to search for local automotive locksmiths). Includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the main reason for your 500 key fob being inoperative. Modern key fobs have a limited operating range, and must be within a few feet of the vehicle to operate. If you are not within 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 in the coin cell (Part number CR2032) with a fresh one from a reliable brand like Panasonic, Duracell, or Energizer. They are typically available in your local hardware store, or online. After you've replaced the coin cell battery You can test it by standing near your Fiat 500 and pressing the buttons. The car should flash its parking lights, and the key fob should be able to operate the lock and unlock buttons. If the fob's key doesn't work after replacing the battery, it could have water damage that prevents it from communicating with the receiver module in your vehicle. Water damage can occur in a variety of ways, from the slightest splash to submerging the fob in salt water at the beach. If you think your fob was exposed to water, place it in a bag of rice to draw out the moisture. If this doesn't work, your fob may need to be reset by an experienced locksmith or dealer. Water Damage Although the fob is equipped with rubber seals that keep water from the chip's electronic circuit and out of the ocean or washing it in a machine could cause water damage. Saltwater is particularly dangerous to the circuit board of the fob and can cause it to short out and eventually end up dying. If you get the fob wet, it's not an ideal idea however, if you drop it in a glass of water or forget to remove it from your pocket before you run the washing machine do not give up hope. First remove the battery from the fob. Clean the electronic chip using isopropyl ethanol or a similar product and dry it thoroughly before replacing the battery. Then check the fob to see if it works. If the key doesn't function, it may need to be reprogrammed. This is usually handled by an auto locksmith or dealer. If the key is more recent and was not programmed to your car It is likely that it needs to be replaced completely. This is a simple procedure that can be completed by a professional locksmith for automotive use. The locksmith will require the key to be cut to match the car's ignition. fiat key replacement will also need to program the fob into the car's system. This is a quick and inexpensive process that can be completed on the same day. Receiver Module Issues Your 500 key fob may not work because it's out of range. The remote usually has an area of 30 feet or less and if it's far from your car, it will not respond to your commands. This can be fixed by moving closer to your vehicle until it starts responding. If you've replaced the battery on your coin (commonly called”button” or “button” or “watch”) and the fob isn't working It could be because of an internal circuit board issue. Reprogramming the fob is usually the solution to this problem. You can find the procedure for most vehicles on YouTube or in the owner's manual. You may need to replace the metal clips that keep the coin battery in place. If they loose tension it could prevent the coin battery from sitting properly, and this will cause your remote to malfunction. In rare instances, the fob may become disconnected from your vehicle due to software issues or hardware issues. This can cause a major trouble, but you could usually resolve this issue by visiting a local dealer or auto locksmith to have them reprogram your fob for you. In some instances it is possible that the software will require reinstallation into your body control modules. Interference Interference can also cause the key fob to not receive or transmit an signal. This could occur if the key fob is located near an electronic radio transmitter (cell phones, radar detectors) or another source of electromagnetic radiation. The key fob may not function because of a problem with the buttons water damage or damage to the internal chips. If your key fob suddenly stopped working, or you have tried everything at home to solve the issue (e.g. battery replacement, reprogramming and using the spare key fob, you might have a malfunctioning receiver module on your 500. The receiver module, located beneath the dashboard, picks up radio frequency signals from your key fob. Then, it converts them into electronic commands that the vehicle interprets. There is a straightforward method to reset the 500's in-board system including the keyfob. Disconnect the battery 12 volt for about 15 minutes, by taking off the negative cable first then the positive cable. Then reconnect the battery. This will remove any remaining electrical charge and restart the car's computers. This can help you the key fob to function again. If the problem persists you should speak with an expert technician. They'll be able to determine the root of your problems.