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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 myriad of reasons why the fob may stop functioning. This could be due to a dead coin-battery, water damage, issues with the receiver module, and interference. This listing is for an NEW replacement Fiat Flip Key Remote – look-alike Ilco brand that must be professionally programmed by a local automotive locksmith (click here to search for a Locksmith Search). It includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the main reason for your 500 key fob that isn't working. Modern key fobs come with a restricted operating range, and should be within a few feet of the car to operate. If you're far from your vehicle and press the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this happens, replace the battery in the coin cell (Part number CR2032) by a new one from a reliable brand like Panasonic, Duracell, or Energizer. You can find them in the local hardware store or online. After you've replaced the coin cell battery, you can test it by standing close to your Fiat 500 and pressing the buttons. The car will blink its parking lights, and the key fob will operate the lock and unlock switches. If your key fob still does not work after replacing the battery, it may be water damage which has prevented it from communicating with the module inside your vehicle. Water damage can occur in a variety of ways, ranging from a light splash to submerging your fob in salt water at the beach. If you suspect your fob was exposed to water, try putting it in a dry rice bag to draw the moisture back out. If that doesn't work, your fob may need to be reprogrammed by an experienced auto locksmith or the dealer. Water Damage Although the fob is equipped with rubber seals that keep water out of the chip's electronic circuit the device, submerging it into the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to become shorted and eventually fail. It's not the best idea to let the fob get wet however, but don't give it up if you accidentally drop it in water or fail to take it out of your pants pocket. First remove the battery from the fob. Before replacing the battery, clean the electronic chip using isopropyl or another similar product. Next try the fob and test if it works. If the key still doesn't work, it may need to be programmed again. This is usually handled by an auto locksmith or dealer. If the key is older and was not programmed to your car It is likely that it needs to be replaced completely. A professional locksmith in the automotive industry can do this job. The locksmith needs to cut the key to match the ignition of your vehicle. The locksmith also needs to reprogram your fob in the car's system. This is a cheap and quick procedure that can be completed within the same day. Receiver Module Issues Your 500 key fob may stop working because it is out of range. The remote usually has 30 feet of range or less, and if it's too far away from your car it will not respond to your commands. It's easy to fix this by moving the remote closer to your vehicle until it responds. If you've replaced your coin battery (commonly called”button” or “button” or “watch”) and the fob isn't working It could be because of an internal circuit board issue. In the majority of cases, reprogramming your fob will fix the issue. You can find the instructions on how to do this on the majority of vehicles by searching YouTube or reading the owner's manual. It is possible to replace the metal clips that hold the coin battery in place. If they lose tension, it could hinder the coin battery from sitting properly and can cause your remote to malfunction. In rare instances it is possible that the fob will become desync'd with your vehicle due to software problems or hardware issues. This could be a huge issue, but you are able to usually resolve this issue by visiting an auto locksmith to have them reprogram your fob. In certain instances, they may need to reinstall the program in your body control module, too. Interference Interference can also cause the key fob to not receive or transmit an signal. This may happen if the keyfob's location is in close proximity to a radio transmitter, like a cell phone or radar detector. Other reasons why the key fob might not work may be a lack of connection to the buttons or damage to the internal chip or water damage. If the key fob has suddenly stopped working, in the middle of the night or after trying everything you can do at home to resolve it e.g. You might have a damaged 500 receiver module if you've tried replacing the battery, reprogramming, and using an alternative key fob. The receiver module, located beneath the dashboard, receives radio frequency signals from your key fob. TheKeyLab converts them into electronic commands that the vehicle interprets. There's a simple method to reset the 500's onboard system including the keyfob. Disconnect the battery for 15 minutes by 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 computers. This could help get your key fob working again. If the issue continues, you should seek the advice of an expert technician. They'll be able determine the root of your issue.