Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a convenient method to unlock the doors and start the car. There are many reasons the fob won't work. This could be due to a dead coin battery or damaged receiver module, water damage problems, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It must be professionally programmed (click here to search for local locksmiths in the automotive industry). Includes trunk, lock and unlock buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob that isn't working. Modern key fobs come with a restricted operating range, and must be within just a few feet of the vehicle in order to function. If you're not close to your vehicle and you press the key fob button the car won't respond and will display an "Key Fob Not Detected" message in the instrument cluster. If this happens, replace the battery in the coin cell (Part number CR2032) with a fresh one from a reputable manufacturer like Panasonic, Duracell, or Energizer. You can find them in the 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 car should flash its parking lights, and the key fob should be able to operate the lock and unlock buttons. If your key fob doesn't work even after replacing the battery, there may be water damage that hinders it from interacting with the module in your vehicle. Water damage can happen in many ways, including simply splashing or submerging the key fob into saltwater at the beach. If you believe your fob was exposed to water, place it in a rice bag to draw out the moisture. If this does not work, you'll have to get your fob reprogrammed either by an auto locksmith or a dealer. Water Damage Water damage can happen if you submerge the fob in the ocean, or wash it in a machine. Saltwater poses a particular risk to the circuit board of the fob, causing it to short out and eventually end up dying. Getting the fob wet is not an ideal idea but if you accidentally drop it in an empty cup of water, or do not remember to remove it from your pants pocket before running the washer and you don't have a chance, don't give in. Remove the battery first. Before replacing the battery, clean the electronic chip with isopropyl or similar products. Check the fob again to check if it's functioning. If the key isn't working it could need to be reprogrammed. This is typically handled by a professional or dealer auto locksmith. If your key is a bit older and not programmed to work with your vehicle, you will need to replace it completely. A professional locksmith in the automotive industry can complete this simple process. The locksmith will have to cut the key to match the ignition of your car. The locksmith will also have to reprogram your fob into the car's system. This is a simple and affordable process that can usually be completed the same day. Receiver Module Issues Your 500 key fob may not function because it's out of range. The remote's range is of 30 feet. So in the event that you are far from your vehicle it won't respond to your commands. This can be easily fixed by moving it closer to your vehicle until it begins responding. If you've replaced the battery in your coin (commonly called a "button" or "watch") and your fob still won't work, it could have an internal circuit board issue. In most cases, reprogramming the fob will fix the problem. There are instructions on how to do this for the majority of automobiles by searching YouTube or reading the owner's manual. It is possible to replace the metal clips that keep the battery of your coin in place. If they loose tension, it can prevent the coin battery from being properly seated and can cause your remote to malfunction. In rare cases, the fob may become disconnected from your vehicle due to software issues or hardware issues. This could be a huge problem, but you can usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob for you. In certain situations they might need to install the software again in your body control module, as well. https://www.thekeylab.co.uk/fiat-car-keys/ can also cause the key fob to not receive or transmit a signal. This could happen if the key fob is located near the radio transmitter (cell phones and radar detectors) or another source of electromagnetic radiation. The key fob could not function due to a bad connection to the buttons water damage or damage to the internal chips. If your key fob suddenly stopped working, or if you've tried everything at home to resolve it (e.g. battery replacement, reprogramming and using the spare key fob, you might have a malfunctioning receiver module on your 500. The receiver module, which is located under the dashboard, picks up radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. Luckily, there is an easy method of resetting all of the onboard systems in your 500 keys, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Then reconnect the battery. This will eliminate any remaining electric current, and also restart the computer in your car. This can help you get your key fob to work again. If the issue persists, you should seek out an expert technician. They will be able to diagnose the exact cause of your problem.