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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to unlock the doors and start the car. There are a variety of reasons why the fob won't work. These include a dead battery damage to the receiver module, water issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote – like the Ilco brand that needs to be programmed professionally by a local locksmith (click here to search for a Locksmith Search). Includes lock, unlock, and trunk buttons. Dead Coin Battery The most frequent reason why your 500 key fob won't work is an inactive battery. Modern key fobs have limited operating range and must be within only a few inches from the vehicle in order to function. If you are not within your vehicle and hit the keyfob, it will not respond and display the message “Key Fob Not Detected”. If this happens, simply replace the battery in the coin cell (Part number CR2032) by a new one from a trusted brand like Panasonic, Duracell, or Energizer. You can find them in 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 car will blink its parking lights and the key fob will operate the lock and unlock buttons. If the key fob doesn't function after replacing the battery, it could be damaged by water, which prevents it from connecting to the receiver module inside your vehicle. Water damage can happen in a number of ways, from small splashes to submerging the fob salt water at the beach. If you suspect your fob was exposed to water, put it in a dry rice bag to pull the moisture back out. If this does not work, you'll need to have your fob reprogrammed either by an auto locksmith or a dealer. Water Damage While the fob has some rubber seals that keep water out of the chip's electronic circuit and out of the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short and then fail. If you get the fob wet, it's not an option but if you accidentally drop it in the water in a cup or forget to remove it from your pants pocket before running the washer Don't give up hope. Remove the battery first. Before replacing the battery, clean the electronic chip with isopropyl or another similar product. Check the fob to check if it's working. If the key isn't working, it may have to be programmed again. This is usually handled by an auto locksmith or dealer. If your key is older and not programmed to work with your vehicle it is necessary to replace it completely. A professional locksmith for automotive will be able to complete this process. The locksmith will have to cut the key to match the ignition on your vehicle. The locksmith also needs to reprogram your fob in the vehicle's system. This is an affordable and quick procedure that can be completed the same day. Receiver Module Issues One of the main reasons your 500 key fob may stop functioning is because it's out of range. The remote's range is of 30 feet, which means should you be too far from your car, it won't respond to your commands. It is possible to solve this issue by moving the remote closer to your car until it responds. If your fob isn't working after replacing the coin battery, also known as a “button”, “watch” or “button”, it could be due to an issue with the internal circuit board. In fiat 500 key fob replacement , reprogramming the fob will resolve this problem. You can find the instructions on how to do this for all automobiles by searching YouTube or checking out the owner's manual. You may need to replace the metal retaining clips that keep the coin battery in place. If they loose tension, they could stop the coin battery from being properly seated, and this will result in the malfunction of your remote. In rare cases the fob could be desync'd with your vehicle due to software or hardware issues. You can fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In some cases, they may need to reinstall the software on your body control module, as well. Interference Interference can also cause the key fob not to receive or transmit a signal. This is possible when the key fob is near radio transmitters (cell phones or radar detectors) or any other source of electromagnetic radiation. Other reasons the key fob might not function may be a lack of connection to the buttons and internal chip or water damage. If the key fob suddenly stopped working, in the middle of the night and you've tried everything you can at home to fix it e.g. replacing batteries, reprogramming or using the spare key fob, you might have a defective receiver module on your 500. The receiver module is located under the dash and is able to pick up the radio frequency signals from the key fob. It converts them to electronic commands that the vehicle interprets. There's a quick and easy way to reset the 500's in-board system including the keyfob. Disconnect the battery for 15 minutes, removing first the negative cable and then the positive cable. Reconnect the battery. This will get rid of any residual electricity and restart the car's computer system, which can help you the key fob to function again. If the issue continues, you should consult an expert technician. They can determine the root of your issue.