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Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob allows you to easily open doors and start your vehicle. However, there are many reasons why the fob may stop functioning. These include a dead battery damage to the receiver module, issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote – like the Ilco brand that needs to be professionally programmed by a local locksmith (click here to search for a Locksmith Search). It includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob not functioning. Modern key fobs have a limited range of operation, and must be within some feet of the vehicle in order to function. If you are far from your vehicle and you press the key fob button the car won't respond and will display a “Key Fob Not Detected” message in the instrument cluster. If this occurs If this happens, replace the battery in the coin-cell (Part Number CR2032) by a fresh one of a reliable brand, such as Panasonic Duracell or Energizer. They are usually available at your local hardware store, or online. You can test the coin-cell battery by pressing the buttons while standing close to your Fiat 500. The parking lights will flash and the key fob will operate the lock and unlock switches. If the fob's key doesn't work after replacing the battery, it might be damaged by water, which prevents it from communicating with the receiver module in your vehicle. Water damage can happen in a number of ways, ranging from small splashes to submerging the fob in salt water at the beach. If you suspect that your fob was exposed to water, place it in a rice bag to draw out the moisture. If this fails, you'll need to have your fob reset by an auto locksmith or dealer. Water Damage While the fob comes with rubber seals to keep water out of the chip's electronic circuit, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to short and eventually end up dying. It's not a good thing to soak the fob in water however, don't give it up if you accidentally drop it in water or fail to take it out of your pocket. First take the battery off the fob. Clean the electronic chip using isopropyl alcohol or another similar product and dry it completely before replacing the battery. Test the fob next to determine if it's functioning. If the key still doesn't work, it may need to be changed. This is usually done by a dealer or professional auto locksmith. If the key you have is older and is not programmed for your vehicle You will need to replace it completely. This is a simple procedure that can be completed by a professional locksmith for automotive use. The locksmith will have to cut the key to match the ignition on your vehicle. They'll also have to reprogram the fob to the system of your car. This is a cost-effective and quick process that can be completed the same day. fiat 500 key of the main reasons why your 500 key fob could stop functioning is that it's out of range. The remote has a range of 30 feet, which means if you are too far from your car it won't respond to your commands. This can be easily fixed by moving closer to your vehicle until it begins responding. If your fob doesn't work after replacing the coin battery, also known as a “button”, “watch” or “button” or “button”, it could be a problem with the internal circuit board. Reprogramming the fob usually resolves this issue. You can find the instructions for most vehicles on YouTube or in the owner's guide. You may have to replace the metal clips that keep the coin battery in place. If they lose tension it can prevent your coin battery from being properly seated and cause your remote to malfunction. In rare instances, the fob can become out of sync with your vehicle because of hardware or software problems. This could be a huge problem, but you can usually fix it by visiting an auto locksmith to have them reprogram your fob for you. In certain situations they may have to install the software again in your body control module, too. Interference Interference can also cause the key fob not to receive or transmit the signal. This can occur when the key fob is in close proximity to a radio transmitter like a cellphone or radar detector. The key fob might not function due to a bad connection with the buttons or water damage, or damage to the internal chips. If the key fob has stopped working one day without notice and you've tried every option at home to resolve it e.g. It could be a defective 500 receiver module after you've tried replacing the battery, reprogramming it, or using a spare key fob. The receiver module is situated under the dash, and it picks up the radio frequency signals from the key fob. It converts them into electronic commands that the vehicle interprets. There is a simple way to reset the 500's on-board system including the keyfob. Disconnect the battery 12 volt for approximately 15 minutes by removing the negative cable and then the positive cable. Reconnect the battery. This will eliminate any remaining electrical charge and restart the car's computers, which can help the key fob to function again. If the problem persists it is recommended that you consult a certified technician. They will be able to determine the exact cause of your problem.