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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to unlock the doors and get started the car. There are many reasons the fob won't work. This includes a dead battery water damage, problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It has to be professionally programmed (click here to find local automotive locksmiths). It includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob not functioning. Modern key fobs operate with a restricted operating range, and should be within some feet of the vehicle to function. If you're far from your vehicle and you press the key fob button, the car won't be able to respond, and will display the “Key Fob Not Detected” message in the instrument cluster. If this happens, simply replace the battery on your coin cell (Part number CR2032) by a new one from a reputable manufacturer such as Panasonic, Duracell, or Energizer. They are usually available at your local hardware store or online. After you've changed the battery on the coin cell You can test it by standing next to your Fiat 500 and pressing the buttons. The parking lights should flash and the key fob will operate the lock and unlock switch. If your key fob still isn't working even after replacing the battery, there may be water damage that hinders it from interacting with the module inside your vehicle. Water damage can occur in a variety of ways, ranging from an accidental splash to submerging the fob salt water at the beach. If you suspect your fob has been exposed to water, try placing it in a dry rice bag to pull the moisture back out. If this doesn't work, you will need to have the fob reset by an auto locksmith or dealer. Water Damage Water damage can occur if you submerge the fob in the ocean or wash it in a washing machine. Saltwater is particularly dangerous to the fob's circuit board which causes it to short out and eventually die. The fob getting wet is not an option, but if you drop it into the water in a cup or fail to take it out of your pants pocket before running the washing machine do not give up hope. First take the battery off the fob. Before replacing the battery clean the electronic chip with isopropyl or a similar product. Check the fob to determine if it's working. If the key does not function it could need to be programmed again. This is typically done by a dealer or professional auto locksmith. If the key is older and has never been programmed to your car it is likely to need to be replaced completely. This is a simple process which can be accomplished by a professional locksmith for automotive use. The locksmith will need the key to be cut to match your vehicle's ignition. The locksmith also needs to reprogram your fob in the vehicle's system. This is a cheap and quick procedure that can be completed on the same day. Receiver Module Issues One of the simplest reasons your 500 key fob could stop working is because it's out of range. The remote usually has an operating range of 30 feet or less, and if it's too far from your vehicle, it won't respond to your commands. It's easy to fix this by moving the remote closer to your vehicle until it responds. If your fob won't work 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. In most cases, reprogramming the fob will solve the issue. You can find the procedure for the majority of vehicles on YouTube or in the owner's guide. It's possible that you need to replace the metal clips that hold the coin battery in place. If they lose tension it could prevent the coin battery from being seated properly, and this will cause your remote to malfunction. In rare cases, the fob may become desync'd with your vehicle due to software issues or hardware issues. This issue can be fixed by visiting your local dealer or auto-locksmith to reprogram your key fob. In some instances they may have to reinstall the program in your body control module as well. Interference Interference can also cause the key fob to not be able to receive or transmit a signal. This can happen when the key fob is close to a radio transmitter (cell phones and radar detectors) or any other source of electromagnetic radiation. Other reasons the key fob could not function may be a lack of connection to the buttons or damage to the internal chip or water damage. If the key fob has been unable to function for a while out of the blue, or after trying every option at home to resolve it e.g. You might have a damaged 500 receiver module after you've tried replacing the battery, reprogramming or using an alternative key fob. fiat key , which is 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's a simple method to reset the 500's onboard system including the keyfob. Disconnect the battery for 15 minutes by removing first the negative cable, then the positive cable. Reconnect the battery. This will get rid of any remaining electrical charge and restart the car's computers. This could allow you to the key fob to function again. If the issue persists, you should seek out an expert technician. They'll be able identify the root cause of your issues.