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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 is a great way to open the doors and begin the car. There are a variety of reasons why the key fob might stop working. These include a dead battery damaged receiver module, water damage problems, 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 find local automotive locksmiths). Includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is probably the most common cause of your 500 key fob being inoperative. Modern key fobs only have limited operating range and must be within just a few inches of the vehicle in order to function. If you are not within your car and push the keyfob button it will not respond, and display the message “Key Fob Not Detected”. If this happens, replace the battery on your coin cell (Part number CR2032) by a new one from a reliable brand such as Panasonic, Duracell, or Energizer. They are available at the local hardware store or online. After you've changed the battery on the coin cell You can test it by standing near your Fiat 500 and pressing the buttons. The parking lights will flash and the key fob should operate the lock and unlock switch. If your key fob still isn't working even after replacing the battery, it may be water damage which has prevented it from connecting to the module in your vehicle. Water damage can occur in many ways, such as an easy splash or submerging the key fob into saltwater at the beach. If you think your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this does not work, you'll require your fob to be changed by an auto locksmith or dealer. Water Damage The fob does have rubber seals to keep water out of the chip's electronic circuit and out of the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to short, and eventually die. It's not a good idea to submerge the fob in water however, but don't give it up even if you accidentally drop the fob in the water or don't remove it from your pocket. First, remove the battery from the fob. Before replacing the battery, clean the electronic chip with isopropyl or a similar product. Test the fob afterward to determine if it's functioning. If the fob doesn't work then it might need to be reset. This is typically handled by a professional or dealer auto locksmith. If the key is older and was not programmed to your vehicle It will most likely need to be replaced completely. This is a simple procedure which can be accomplished by a professional locksmith for automotive use. The Key Lab will need to cut the key to match the ignition of your car. They'll also have to reprogram the fob in your car's system. This is an affordable and fast process that can be completed the same day. Receiver Module Issues The 500 key fob could not work because it's out of range. The remote typically has an area of 30 feet or less and if it's far from your vehicle, it will not respond to your commands. You can easily solve this problem by moving the remote closer to your car until it responds. If your fob isn't working after you replace the battery in the coin, also known as a “button”, “watch” or “button” It could be a problem with the internal circuit board. Reprogramming the fob usually resolves this issue. You can find the steps for most vehicles on YouTube or in the owner's guide. It is sometimes necessary to replace the metal clips that hold the coin batteries in their place. If they lose tension it can stop your coin battery from being properly seated and cause your remote to malfunction. In rare cases, the fob may become disconnected from your vehicle due to software or hardware issues. This could be a huge headache, but you can usually fix it by visiting a local dealer or auto locksmith to reprogram your fob. In certain instances, the software may also need to be reinstalled in your body control modules. Interference In addition to a dead battery on a coin The key fob might not be able to transmit or receive the signal due to interference. This is possible when the key fob is close to radio transmitters (cell phones and radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob could not function include a weak connection to the buttons and internal chip, or water damage. If the key fob been unable to function for a while without notice and you've tried everything you can at home to solve it e.g. replacing the battery, reprogramming, and using the spare key fob, it could have a damaged receiver module on your 500. The receiver module is situated under the dash and picks up the radio frequency signals from the key fob. It converts the signals into electronic commands which are then processed by the vehicle. There is a simple way to reset the 500's in-board system, including the keyfob. Disconnect the 12 volt battery for about 15 minutes by taking off the negative cable first then the positive cable. Then reconnect the battery. This will eliminate any remaining electricity, and restart the computer of your car. This will help you get your key fob to work again. If the issue persists you should seek out an expert certified technician. They will be able to determine the exact cause of your problems.