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Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob makes it simple to open doors and start your vehicle. There are a myriad of reasons the fob could stop working. This could be due to a dead coin battery damage to the receiver module, problems, and interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be professionally programmed by a local locksmith (click here for Locksmith Search). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most frequent cause of your 500 key fob being inoperative. TheKeyLab operate with a limited operating range, and must be within a few feet of the vehicle to function. If you're far away from your vehicle and press the key fob button, the car won't respond and will display the “Key Fob Not Detected” message in the instrument cluster. If this occurs you need to replace the battery of your coin-cell (Part Number CR2032) by a fresh one of a reputable brand like Panasonic Duracell or Energizer. You can typically find them at your local hardware store or online. After you've replaced the coin cell battery, you can test it by standing close to 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 switches. If your key fob still does not work after replacing the battery, it may be water damage which prevents it from connecting to the module in your vehicle. Water damage can occur in many ways, such as a simple splash or submerging your key fob in saltwater at the beach. If you suspect that your fob has been exposed to water, you can try placing it in a dry rice bag to draw the moisture out. If this doesn't work the fob might need to be reset by a professional 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 washer. Saltwater is especially dangerous to the fob's circuit board, causing it to short out and eventually end up dying. It's not good to let the fob get wet but don't give up in the event that you accidentally drop it in water or fail to remove it from your pants pocket. First take the battery off the fob. Clean the electronic chip with isopropyl or a similar product and then dry it thoroughly before replacing the battery. Check the fob again to verify if it's working. If the key does not function, it may need to be reprogrammed. This is usually handled by an auto locksmith or dealer. If the key is newer and hasn't been programmed to your vehicle It will most likely need to be replaced completely. This is a simple procedure that can be carried out by a professional automotive locksmith. The locksmith will require the key cut to match your car's ignition. They'll also have to program the fob into your vehicle's system. This is a simple and cost-effective process that can usually be completed within the next day. Receiver Module Issues The 500 key fob could not work because it's out of range. The remote has a maximum range of 30 feet. Therefore, if you are too far from your car, it won't respond to your commands. You can solve this issue by moving the remote closer to your vehicle until it responds. If your fob won't work after replacing the battery in the coin, also known as a “button”, “watch” or “button” or “button”, it could be due to an issue with the internal circuit board. Reprogramming the fob typically resolves this problem. The instructions are available for the majority of vehicles on YouTube or in the owner's guide. You may need to replace the metal clips that hold the coin battery in place. If they lose tension it could prevent the battery from being properly seated, and this will result in the malfunction of your remote. In rare cases the fob may be out of alignment with your vehicle because of hardware or software issues. This can cause a major issue, but you are able to usually fix it by visiting a local dealer or auto locksmith to have them reprogram your fob. In some cases they might need to reinstall the software on your body control module as well. Interference Interference can also cause the key fob to be unable to receive or transmit an signal. This could occur if the key fob is located near a radio transmitter (cell phones and radar detectors) or any other source of electromagnetic radiation. Other reasons the key fob might not work may be a lack of connection to the buttons or damage to the internal chip or water damage. If the key fob has suddenly stopped working, out of the blue or even after trying everything you can do at home to solve it e.g. replacing batteries, reprogramming or using the spare key fob, it could have a defective receiver module on your 500. The receiver module, which is located beneath the dashboard, is able to pick up radio frequency signals from your key fob. It transforms the signals into electronic commands which are then processed by the vehicle. Fortunately, there's an easy method to reset all of the on-board systems in your 500 device, including the key fob. Disconnect the 12 volt battery for about 15 minutes, by removing the negative cable first then the positive cable. Reconnect the battery. This will remove any residual electricity and restart the car's computers. This can help the key fob to function again. If the problem persists, you should consult an expert certified technician. They will be able to determine the exact cause of issues.