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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 allows you to easily open doors and start your car. There are many reasons why the key fob might stop working. These include a dead coin battery or water damage, receiver module issues, and interference. fiat replacement key fob is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that needs to be professionally programmed by a local locksmith (click here to search for a Locksmith Search). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the main cause of your 500 key fob not working. Modern key fobs have a limited range of operation, and should be within some feet of the vehicle to operate. If you are far from your vehicle when 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 happens, simply replace the coin cell battery (Part number CR2032) with a fresh 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 battery of your coin cell It is possible to test it by standing next to your Fiat 500 and pressing the buttons. The car will blink its parking lights and the key fob should operate the lock and unlock switches. If your key fob still does not work after replacing the battery, there may be water damage which is preventing it from connecting to the module inside your vehicle. Water damage can occur in a variety of ways, from a light splash to submerging the fob into salt water at the beach. If you suspect your fob has been exposed to water, try putting it in a dry rice bag to draw the moisture back out. If this does not work, you'll need to have your fob reset by an auto locksmith or dealer. Water Damage Water damage can happen if you immerse the fob in the ocean, or wash it in a washer. Saltwater can cause the circuit board to short, and eventually cease to function. If you get the fob wet, it's not an ideal choice but if you accidentally drop it into an empty cup of water, or fail to remove it from your pants pocket before running the washer and you don't have a chance, don't give in. Remove the battery first. Clean the electronic chip with isopropyl alcohol or a similar product and then dry it thoroughly before replacing the battery. Test the fob afterward to verify if it's working. If the key still doesn't work, it may need to be changed. This is usually done by an auto locksmith or dealer. If your key is a bit older and not programmed to work with your vehicle You will need to replace it completely. This is a straightforward process that can be carried out by a professional locksmith for automotive use. The locksmith will need the key cut to match your car's ignition. The locksmith also needs to reprogram your fob into the car's system. This is a simple and cost-effective process that is usually completed on the same day. Receiver Module Issues One of the most common reasons your 500 key fob won't be functioning is because it's 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 can be solved by moving closer to your vehicle until it begins responding. If your fob doesn't work after replacing the battery in the coin, also called a “button”, “watch” or “button”, it could be a problem with the internal circuit board. In the majority of cases, reprogramming your fob will solve the issue. You can find the instructions for the majority of vehicles on YouTube or in the owner's guide. You may need to replace the metal retaining clips that keep the coin battery in place. If they loose tension, it can prevent your coin battery from sitting properly, causing your remote to malfunction. In rare instances, the fob can become out of alignment with your vehicle because of hardware or software problems. This can be a major issue, but you are able to usually fix it by visiting a local dealer or auto locksmith to reprogram your fob for you. In some instances the software may require reinstallation in your body control modules. Interference In addition to a dead coin battery The key fob may not be receiving or transmitting signals due to interference. This may happen if the key fob is in close proximity to a radio transmitter, like a cellphone or radar detector. The key fob may not work due to a bad connection with the buttons or water damage, or damage to the internal chips. If your key fob suddenly stopped working, or if you've tried everything at home to fix it (e.g. It could be a defective 500 receiver module If you've tried replacing it with a battery, reprogramming, and using an alternative key fob. The receiver module, located beneath the dashboard, is able to pick up radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. There is a simple way to reset the 500's internal 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 remove any remaining electricity, and allow you to restart the computer of your car. This can help get your key fob to work again. If the issue persists, you should consult an expert technician. They'll be able determine the exact cause of your issue.