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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a convenient method to unlock the doors and get started the car. However, there are a variety of reasons why the key fob might stop working. These include a dead coin battery or damage to the receiver module, water issues, and interfering. This listing is for a NEW replacement Fiat Flip Key Remote – like the Ilco brand that needs to be programmed professionally by a local automotive locksmith (click here to search for a Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most common reason your 500 key fob will not function is due to the battery is dead. Modern key fobs offer only a limited range of operation and must be within a few inches of your vehicle in order to function. If you're far from your car and hit the keyfob, it won't respond and display the message “Key Fob Not Detected”. If this happens, replace the coin cell battery (Part number CR2032) by a new one from a reputable brand like Panasonic, Duracell, or Energizer. They are available at your local hardware store or online. After you've replaced the battery in the coin cell You can test it by standing near your Fiat 500 and pressing the buttons. The parking lights should flash and the key fob should operate the lock and unlock switch. If the fob's remote doesn't function after replacing the battery, it may have water damage that prevents it from communicating with the receiver module inside your vehicle. Water damage can occur in many ways, including simply splashing or submerging your key fob in saltwater at the beach. If you believe your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this fails, you'll need to have the fob reprogrammed either by an auto locksmith or a dealer. Water Damage While the fob has some rubber seals to keep water from the chip's electronic circuit it, submerging it in the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to become shorted and eventually die. If you get the fob wet, it's not a good idea, but if you drop it in an empty cup of water, or don't remember to take it out of your pants pocket prior to running the washer do not give up hope. Take the battery off first. Clean the electronic chip using isopropyl or a similar product and dry it thoroughly before replacing the battery. Next try the fob and check if it functions. If the key does not function, it may have to be reset. This is typically handled by a professional or dealer auto locksmith. If the key is a newer model and has never been programmed to your vehicle, it will likely need to be replaced completely. This is a straightforward process that can be handled by a professional locksmith for automotive use. The locksmith will need the key to be cut to match your vehicle's ignition. They'll also need to reprogram the fob to the car's system. This is a simple and cost-effective process that can be completed within the same day. Receiver Module Issues One of the main reasons why your 500 key fob might stop functioning is because it's out of range. The remote usually has a range of 30 feet or less and if it's far away from your car it won't respond to your commands. You can fix this by moving the remote closer to your vehicle until it responds. If your fob won't work after you replace the coin battery, also called a “button”, “watch” or “button”, it may be due to a malfunction on the internal circuit board. In the majority of cases, reprogramming your fob can resolve the issue. The instructions are available for the majority of vehicles on YouTube or in the owner's manual. It is possible to replace the clips made of metal that hold the coin batteries in their place. If they lose tension it can stop your coin battery from being properly seated and cause your remote to malfunction. In rare instances, the fob might be out of connection with your vehicle as a result due to hardware or software issues. This can be a major issue, but you are able to usually resolve this issue by visiting an auto locksmith to reprogram your fob. In certain instances, the software may also need to be reinstalled in your body control modules. Interference Interference can also cause the key fob to not receive or transmit the signal. This could happen when the keyfob's location is in close proximity to a radio transmitter, like a cellphone or radar detector. The key fob might not work due to a bad connection to the buttons or water damage, or damage to the internal chips. If the key fob suddenly stopped working, suddenly and you've tried everything you can at home to resolve it e.g. battery replacement, reprogramming and using the spare key fob, you might have a defective receiver module on your 500. The receiver module, which is located under the dashboard, is able to pick up radio frequency signals from your key fob. replacement fiat key transforms the signals into electronic commands which are then translated by the vehicle. Luckily, there is an easy method to reset every single system on board in your 500 device, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable, then the positive cable. Reconnect the battery. This will eliminate any residual electricity and restart the car's computers. This could help the key fob to function again. If the issue persists, you should speak with an expert technician. They will be able to identify the exact cause of problems.