Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 makes it easy to open doors and start your car. There are a variety of reasons why the key fob might stop working. These include a dead battery water damage, receiver module problems, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to search for local automotive locksmiths). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably 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 far from your vehicle and you press the key fob button, the car will not respond, and will display the "Key Fob Not Detected" message in the instrument cluster. If this occurs, replace the coin-cell battery (Part Number CR2032) with a new battery from a reputable brand such as Panasonic Duracell or Energizer. You can find them at the local hardware store or on the internet. After you've replaced the battery of your coin cell, you can test it by standing in front of your Fiat 500 and pressing the buttons. The car will flash its parking lights, and the key fob should operate the lock and unlock buttons. If your key fob doesn't work even after replacing the battery, it might be water damage that prevents it from interacting with the module inside your vehicle. Water damage can occur in a number of ways, ranging from the slightest splash to submerging your fob in salt water at the beach. If you believe your fob was exposed to water, put it in a rice bag to draw out the moisture. If this doesn't work your fob may need to be reset by a professional auto locksmith or dealer. Water Damage While the fob comes with rubber seals to keep water from the electronic chip inside the device, submerging it into the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short, and eventually fail. It's not good to let the fob get wet however, don't give it up when you accidentally drop it in water or fail to take it out of your pocket. First remove the battery from the fob. Before replacing the battery, clean the electronic chip with isopropyl, or a similar product. Next, test the fob to see if it works. If the key isn't working, it may need to be changed. This is usually done by an auto locksmith or dealer. If the key you have is older and not programmed for your vehicle, you will need to replace it completely. A professional locksmith in the automotive industry can carry out this simple task. The locksmith will have to cut the key to match the ignition on your vehicle. The locksmith will also have to reprogram your fob into the vehicle's system. This is a simple and affordable process that can be completed on the same day. Receiver Module Issues One of the simplest reasons your 500 key fob won't be functioning is that it's out of range. The remote typically has an operating range of 30 feet or less and if it's far from your vehicle, it won't respond to your commands. It is possible to fix this by moving the remote closer to your car until it responds. If your fob won't work after replacing the battery inside the coin, which is also known as a "button", "watch" or "button" it may be due to a malfunction on the internal circuit board. Reprogramming https://www.thekeylab.co.uk/fiat-car-keys/ resolves the issue. There are instructions on how to do this for the majority of automobiles by searching YouTube or looking through the owner's manual. You may have to replace the metal retaining clips that keep the battery of your coin in place. If they loose tension, it could prevent the battery from being seated properly, and this will cause your remote to malfunction. In rare cases the fob could be disconnected from your vehicle due to software issues or hardware issues. You can fix this issue by visiting your local auto-locksmith or dealer to reprogram your key fob. In some instances it is possible that the software will require reinstallation in your body control modules. Interference Interference can also cause the key fob not to receive or transmit an signal. This could happen when the keyfob's location is in close proximity to a radio transmitter such as a cell phone or radar detector. Other reasons why the key fob may not function include a poor connection to the buttons or the internal chip or water damage. If your key fob suddenly stopped working, or you've tried everything at home to fix it (e.g. You could have a malfunctioning 500 receiver module in the event that you've tried replacing the battery, reprogramming or using an alternative key fob. The receiver module, which is located under the dashboard, is able to pick up radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets. There is a straightforward method to reset the 500's on-board system, including the keyfob. Disconnect the battery for 15 minutes by taking off first the negative cable, then the positive cable. Reconnect the battery. This will remove any remaining electric current, and also restart the car's computer. This can help you get your key fob working again. If the issue persists, you should consult an experienced technician. They will be able to diagnose the exact cause of your problems.