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Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob makes it easy to open doors and start your vehicle. However, there are many reasons why the fob won't be functioning. This could be due to a dead 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 locksmiths in the automotive industry). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob that isn't working. Modern key fobs come with a limited operating range, and must be within only a few feet from the vehicle to operate. If you are further away from your vehicle, and you press the keyfob button, it will not respond, and display the message “Key Fob Not Detected”. If this happens, simply replace the coin cell battery (Part number CR2032) by a new one from a reputable manufacturer such as Panasonic, Duracell, or Energizer. You can usually find them at your local hardware store or on the internet. After you've replaced the battery in the coin cell You can test it by standing close to your Fiat 500 and pressing the buttons. The parking lights will flash and the key fob should operate the lock and unlock switch. If your key fob still does not work after replacing the battery, there might be water damage that is preventing it from interacting with the module in your vehicle. Water damage can happen in a number of ways, from small splashes to submerging the fob in salt water at the beach. If you believe your fob was exposed to water, you can place it in a bag of rice to draw out the moisture. If this doesn't work, you will have to get your fob reprogrammed either by an auto locksmith or a dealer. Water Damage Water damage can occur when you immerse the fob into the ocean or wash it in a washer. Saltwater can be particularly harmful to the circuit board of the fob and can cause it to short out and eventually die. Getting the fob wet is not a good idea but if you drop it in an empty cup of water, or do not remember to remove it from your pants pocket prior to running the washer, don't give up hope. First, remove the battery. Clean the electronic chip with isopropyl alcohol or a similar product and then dry it thoroughly before replacing the battery. Test the fob afterward to determine if it's functioning. If the fob doesn't work, it may have to be changed. This is usually done by an auto locksmith or dealer. If the key is newer and was not programmed to your car It is likely that it needs to be replaced completely. This is a simple process that can be completed by a professional automotive locksmith. The locksmith will need the key to be cut to match your vehicle's ignition. The locksmith also needs to reprogram the fob into the vehicle's system. This is a quick and cost-effective process that can be completed in the next day. Receiver Module Issues One of the simplest reasons why your 500 key fob won't be functioning is because it's out of range. The remote usually has a range of 30 feet or less and if it's far from your car, it won't respond to your commands. It can be solved by moving it closer to your vehicle until it starts responding. If your fob isn't working after replacing the battery for the coin, also known as a “button”, “watch” or “button” or “button”, it could be due to a problem with the circuit board inside. In key for fiat 500 of cases, reprogramming your fob can resolve the problem. The instructions are available for the majority of vehicles on YouTube or in the owner's manual. It is possible to replace the metal clips that hold the battery of your coin in place. If they loose tension, they could stop the coin battery from being properly seated and can cause your remote to malfunction. In rare cases the fob could be out of sync with your vehicle because of software or hardware problems. This can cause a major problem, but you can frequently fix this issue by visiting an auto locksmith to reprogram your fob for you. In some cases 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 a signal. This could occur if the keyfob is located in close proximity to a radio transmitter like 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 the key fob has suddenly stopped working, in the middle of the night and you've tried everything you can at home to solve it e.g. replacing the battery, reprogramming it and using the spare key fob, you may have a malfunctioning receiver module on your 500. The receiver module, located beneath the dashboard, receives radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. Fortunately, there's an easy method of resetting all of the on-board systems in your 500 device, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Then, reconnect the battery. This will get rid of any remaining electrical charge and restart the car's computers. This can help you the key fob to function again. If the issue persists it is recommended that you consult an experienced technician. They will be able to determine the root of your problems.