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Reasons Your Fiat 500 Key Fob Won't Work A key fob for Fiat 500 makes it easy to open doors and start your vehicle. However, there are a variety of reasons why the fob may stop working. These include a dead coin battery damage to the receiver module, water issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that needs to be programmed professionally by a local locksmith (click here for Locksmith Search). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most frequent reason for your 500 key fob not functioning. Key fobs of today have a limited range of operation and must be within only a few inches from the vehicle in order to function. If you are further away from your car and push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this occurs If this happens, replace the battery in the coin-cell (Part Number CR2032) by a new one of a reputable brand like Panasonic Duracell or Energizer. They are available at the local hardware store or online. After you've changed the battery on the coin cell It is possible to test it by standing close to your Fiat 500 and pressing the buttons. The car will flash its parking lights and the key fob will operate the lock and unlock switches. If the fob's key doesn't function after replacing the battery, it might have water damage that stops it from communicating with the receiver module inside your vehicle. Water damage can occur in a number of ways, ranging from an accidental splash to submerging the fob into salt water at the beach. If you suspect your fob has been exposed to water, you can try placing it in a dry rice bag to draw the moisture out. If this isn't working, you'll need to have the fob reprogrammed either by an auto locksmith or a dealer. Water Damage Although the fob is equipped with rubber seals to keep water out of the electronic chip inside the device, submerging it into the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to short and then die. The fob getting wet is not an ideal idea but if you accidentally drop it in a glass of water or fail to remove it from your pants pocket prior to running the washer do not give up hope. First, remove the battery from the fob. Clean the electronic chip with isopropyl ethanol or a similar product and then dry it thoroughly before replacing the battery. Test the fob next to determine if it's working. If the key still doesn't work, it may have to be programmed again. This is usually handled by a professional or dealer auto locksmith. If the key you have is older and not programmed for your car, you will need to replace it completely. A professional automotive locksmith can do this job. The locksmith must cut the key to match the ignition in your vehicle. The locksmith also needs to reprogram your fob into the car's system. This is a low-cost and fast process that can be completed in the same day. Receiver Module Issues The 500 key fob could be inoperable because it's out of range. The remote usually has 30 feet of range or less, and if it's too far from your car, it won't respond to your commands. This can be fixed by moving it closer to your vehicle until it starts responding. If you've replaced the battery on your coin (commonly called”button” or “button” or “watch”) and the fob isn't working, it could have an internal circuit board issue. Reprogramming your fob can resolve this problem. You can find the instructions on how to do this for most automobiles by searching YouTube or looking through the owner's manual. It is possible to replace the metal clips that hold the coin batteries in place. If they lose tension, it may prevent your battery from sitting properly and cause your remote to malfunction. In rare instances the fob could be desync'd with your vehicle due to software or hardware issues. This issue can be fixed by visiting your local auto-locksmith or dealer to reprogram your key fob. In some instances they may have to reinstall the software on your body control module too. Interference Interference can also cause the key fob to not be able to receive or transmit the signal. This could occur if the keyfob is located in close proximity to a radio transmitter such as a cell phone or radar detector. Other reasons why the key fob may not function may be a lack of connection to the buttons and internal chip or water damage. If the key fob stopped working one day out of the blue, or after trying everything you can do at home to fix it e.g. replacing the battery, reprogramming, and using the spare key fob, it could have a faulty receiver module on your 500. ignition switch is located under the dash, and it picks up the radio frequency signals from the key fob. It then converts them into electronic commands that the vehicle interprets. There is a straightforward method to reset the 500's onboard system including the keyfob. Disconnect the 12 volt battery for about 15 minutes, by disconnecting the negative cable first then the positive cable. Then reconnect the battery. This will eliminate any remaining electricity and restart the car's computers. This could allow you to the key fob to function again. If the problem persists you should consult an expert technician. They'll be able to diagnose the exact cause of your issue.