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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 makes it easy to open doors and start your vehicle. However, there are spare key for fiat 500 www.thekeylab.co.uk why the fob won't be working. This includes a dead coin-battery water damage, problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to search for local locksmiths for your vehicle). Includes trunk, lock and unlock buttons. Dead Coin Battery The most frequent reason that the 500 key fob won't function is an inactive battery. Modern key fobs have a restricted operating range, and should be within some feet of the vehicle to function. If you are far from your vehicle when you 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 then replace the battery for your coin-cell (Part Number CR2032) by a fresh one of a reputable brand like Panasonic Duracell or Energizer. You can usually find them at your local hardware store, or online. After you've replaced the coin cell battery, you can test it by standing near 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 still doesn't work even after replacing the battery, it could be water damage that prevents it from communicating with the module in your vehicle. Water damage can happen in a number of ways, ranging from a light splash to submerging the fob in salt water at the beach. If you suspect that your fob has been exposed to water, try placing it in a dry rice bag to pull the moisture out. If this doesn't work, you will have to get your fob reprogrammed either by an auto locksmith or dealer. Water Damage Water damage can occur if you immerse the fob into the ocean, or wash it in a washing machine. Saltwater is particularly dangerous to the circuit board of the fob which causes it to short out and eventually die. It's not the best idea to soak the fob in water however, don't give it up in the event that you accidentally drop it in the water or don't take it out of your pocket. First take the battery off the fob. Before replacing the battery, clean the electronic chip using isopropyl or a similar product. Test the fob next to verify if it's working. If the key doesn't work, it might need to be programmed again. This is usually handled by a dealer or professional auto locksmith. If the key is a newer model and has never been programmed to your vehicle It is likely that it needs to be replaced completely. This is a straightforward process that can be completed by a professional locksmith for automotive use. The locksmith will need the key to be cut to match the car's ignition. They will also need to reprogram the fob in the car's system. This is a fast and inexpensive process that is usually completed within the same day. Receiver Module Issues One of the main reasons your 500 key fob could stop functioning is because it's out of range. The remote typically has an operating range of 30 feet or less and if it's far away from your car it won't respond to your commands. It's easy to remedy this by moving your remote closer to your car until it responds. If you've replaced the coin battery (commonly known as”button” or “button” or “watch”) and the fob won't work it could be due to an internal circuit board problem. In most cases, reprogramming the fob will resolve this issue. There are instructions on how to do this for the majority of automobiles by searching YouTube or consulting the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in their place. If they lose tension it can prevent the battery from being seated properly and cause the remote to malfunction. In rare instances the fob could be desync'd with your vehicle due to software issues or hardware issues. You can fix this problem by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain situations it may be necessary to reinstall the program in your body control module too. Interference Interference can also cause the key fob to not receive or transmit signals. This may happen if the keyfob is located in close proximity to a radio transmitter, like a cell phone or radar detector. The key fob might not work due to a poor connection with the buttons water damage or damage to the internal chips. If the key fob suddenly stopped working, out of the blue, or after trying everything you can do at home to fix it e.g. replacing batteries, reprogramming or using the spare key fob, it could have a faulty receiver module on your 500. The receiver module, located under the dashboard, receives radio frequency signals from your key fob. Then, it converts them into electronic commands that the vehicle interprets. Fortunately, there's an easy method to reset all of the onboard systems in your 500 keys, including the key fob. Disconnect the battery for 15 minutes by taking off first the negative cable and then the positive cable. Then reconnect the battery. This will eliminate any remaining electrical charge, and then restart the car's computer. This will help you get your key fob to work again. If the issue persists, you should seek the advice of an expert technician. They can determine the exact cause of your issues.