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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a handy way to unlock the doors and get started the car. There are a myriad of reasons why the fob won't be functioning. This could be due to a dead coin battery, damage to the receiver module, issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that needs to be professionally programmed by a local locksmith (click here for Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most frequent cause of your 500 key fob not working. Modern key fobs offer only a limited range of operation and must be within a few inches of your vehicle in order to work. If you are far from your vehicle and push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this occurs then replace the battery for your coin-cell (Part Number CR2032) with a new battery of a reputable brand such as Panasonic Duracell or Energizer. You can find them at your local hardware store, or online. After you've replaced the battery of your coin cell You can test it by standing close to your Fiat 500 and pressing the buttons. The parking lights should light up and the key fob should operate the lock and unlock switches. If your key fob isn't working after replacing the battery, there may be water damage that has prevented it from communicating with the module inside your vehicle. Water damage can happen in a variety of ways, such as simply splashing or submerging your key fob in saltwater at the beach. If you suspect that your fob was exposed to water, place it in a bag of rice to draw out the moisture. If this does not work, you'll need to have your fob reprogrammed either by an auto locksmith or dealer. Water Damage While the fob comes with rubber seals to keep water out of the electronic chip inside, submerging it in the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short and eventually end up dying. It's not the best idea to soak the fob in water, but don't give it up when you accidentally drop it in water or fail to remove it from your pocket. Remove the battery first. Clean the electronic chip with isopropyl or a similar product and dry it completely before replacing the battery. Next try the fob and see if it works. If the key doesn't work, it may have to be reprogrammed. This is typically handled by a professional or dealer auto locksmith. If the key is newer and has never been programmed to your car it is likely to need to be replaced completely. A professional locksmith for automotive can carry out this simple task. The locksmith will have to cut the key to match the ignition on your vehicle. They'll also have to reprogram the fob to your car's system. This is an affordable and fast process that can be completed the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob may stop working is because it's out of range. The remote has a maximum range of 30 feet. So when you're too far away from your vehicle it won't respond to your commands. This can easily be resolved by moving closer to your vehicle until it begins responding. If your fob isn't working after you replace the battery inside the coin, which is also called a “button”, “watch” or “button”, it could be a problem with the circuit board inside. Reprogramming your fob can resolve this problem. The instructions are available for the majority of vehicles on YouTube or in the owner's manual. You may need to replace the metal retaining clips that keep the battery of your coin in place. If they lose tension it can prevent the battery from being seated properly and could result in the malfunction of your remote. In rare cases the fob could be desync'd with your vehicle due to software or hardware issues. This can cause a major problem, but you can usually resolve this issue by visiting an auto locksmith to reprogram your fob. In certain instances, they may need to reinstall the software on your body control module, as well. Interference Interference can also cause the key fob to not be able to receive or transmit the signal. This can occur when the keyfob is located in close proximity to a radio transmitter like a cell phone or radar detector. The key fob may not function because of a weak connection with the buttons or water damage, or damage to the internal chips. If the key fob has suddenly stopped working, without notice or after trying every option at home to solve it e.g. You may have a faulty 500 receiver module in the event that you've tried replacing the battery, reprogramming or using a spare key fob. The receiver module, located under the dashboard, receives radio frequency signals from your key fob. It transforms the signals into electronic commands which are then translated by the vehicle. Luckily, there is an easy method to reset all of the onboard systems in your 500 and include the key fob. Disconnect the battery for 15 minutes, removing first the negative cable and then the positive cable. Then, reconnect the battery. This will remove any residual electricity and restart the car's computers. This could allow you to the key fob to function again. If the problem persists you should speak with an expert technician. They'll be able identify the root cause of your problems.