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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 allows you to easily open doors and start your car. There are many reasons the fob may stop working. It could be due to a dead battery damage to the receiver module, water problems, and interference. This listing is for a NEW replacement Fiat Flip Key Remote – look-alike Ilco brand that must be programmed professionally by a local automotive locksmith (click here for Locksmith Search). Includes trunk, lock and unlock buttons. Dead Coin Battery A dead battery is probably the most common cause of your 500 key fob being inoperative. Modern key fobs operate with a limited range of operation, and should be within only a few feet from the vehicle to function. If you're far from your vehicle and hit the keyfob, it will not respond, and display the message “Key Fob Not Detected”. If this happens, simply replace the coin cell battery (Part number CR2032) with a new one from a trusted brand such as Panasonic, Duracell, or Energizer. They are available at the local hardware store or online. After you've replaced the battery in the coin cell you can test it by standing next to your Fiat 500 and pressing the buttons. The parking lights will flash and the key fob should operate the lock and unlock switch. If the fob's key doesn't function after replacing the battery, it could be damaged by water that blocks it from connecting to the receiver module in your vehicle. Water damage can happen in a variety of ways, from an accidental splash to submerging your fob in salt water at the beach. If you suspect that your fob was exposed to water, you can try placing it in a dry rice bag to draw the moisture out. If this doesn't work, your fob will probably require reprogramming by an experienced auto locksmith or the dealer. Water Damage While the fob has some rubber seals that keep water out of 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 then cease to function. It's not a good idea to submerge the fob in water however, don't give it up even if you accidentally drop the fob in water, or fail to take it out of your pants pocket. First, remove the battery. Before replacing the battery clean the electronic chip with isopropyl or another similar product. Test the fob afterward to see if it is functioning. If the fob doesn't work then it might need to be reset. This is usually done by an auto locksmith or dealer. If the key you have is older and is not programmed for your car You will need to replace it completely. A professional locksmith for cars can carry out this simple task. The locksmith will require the key cut to match your vehicle's ignition. The locksmith also needs to reprogram the fob into the car's system. This is a cost-effective and fast process that can be completed the same day. Receiver Module Issues The 500 key fob you have may not work because it's out of range. The remote's range is of 30 feet. So should you be too far from your vehicle it won't respond to your commands. This can be fixed by moving it closer to your vehicle until it begins responding. If you've replaced the battery on your coin (commonly called a “button” or “watch”) and the fob isn't working It could be because of an internal circuit board problem. Reprogramming the fob typically resolves this problem. You can find instructions on how to do this on the majority of automobiles by searching YouTube or looking through the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in the correct position. If they lose tension, it can stop your coin battery from being properly seated, causing your remote to malfunction. In rare instances the fob could be disconnected from your vehicle because of software or hardware issues. This could cause a significant trouble, but you could often fix this by visiting an auto locksmith to reprogram your fob for you. In fiat car keys may require reinstallation to your body control modules. Interference Interference can also cause the key fob to not be able to receive or transmit an signal. This can happen when the key fob is located near the radio transmitter (cell phones or radar detectors) or any other source of electromagnetic radiation. The key fob may not work because of a weak connection to the buttons or water damage, or damage to the internal chips. If the key fob has been unable to function for a while without notice or even after trying every option at home to resolve it e.g. replacing batteries, reprogramming or using the spare key fob, you could have a faulty receiver module on your 500. The receiver module, which is located beneath the dashboard, detects radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. There is a straightforward method to reset the 500's in-board system, including the keyfob. Disconnect the 12 volt battery for approximately 15 minutes by removing the negative cable first then the positive cable. Reconnect the battery. This will remove any remaining electrical charge, and then restart the car's computer. This will help you get your key fob to function again. If the problem persists it is recommended that you consult an experienced technician. They can identify the exact cause of problems.