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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 makes it simple to open doors and start your car. There are a myriad of reasons the fob could stop functioning. It could be due to a dead battery or water damage, receiver module issues, and 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). It includes lock, unlock, and trunk buttons. Dead Coin Battery The most frequent reason why your 500 key fob will not function is a dead battery. Modern key fobs have a very limited operating range and should be within a few feet of the vehicle 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 happens, simply replace the battery on your coin cell (Part number CR2032) with a new one from a reputable manufacturer such as Panasonic, Duracell, or Energizer. They are usually available in your local hardware store, or online. After you've changed the battery on the coin cell It is possible to test it by standing in front of your Fiat 500 and pressing the buttons. The car should flash its parking lights, and the key fob will operate the lock and unlock switches. If your fob's key does not work after replacing the battery, there may be water damage which prevents 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 the fob in salt water at the beach. If you suspect that your fob was exposed to water, put it in a dry rice bag to draw the moisture out. If this isn't working, you'll need to have your fob reset by an auto locksmith or a dealer. Water Damage Water damage can occur when you immerse the fob into the ocean, or wash it in a washer. Saltwater poses a particular risk to the circuit board of the fob that can cause it to short out and eventually end up dying. It's not the best idea to soak the fob in water, but don't give it up in the event that you accidentally drop it in the water or don't remove it from your pants pocket. First remove the battery from the fob. Clean the electronic chip with isopropyl alcohol or another similar product and dry it thoroughly before replacing the battery. Test the fob afterward to check if it's working. If the key doesn't work, it may need to be reprogrammed. This is typically handled by a dealer or professional auto locksmith. If the key is older and was not programmed to your vehicle It is likely that it needs to be replaced completely. A professional automotive locksmith can complete this simple process. The locksmith will need the key to be cut to match your vehicle's ignition. The locksmith also needs to reprogram the fob into the car's system. This is a quick and cost-effective process which can be completed on the same day. Receiver Module Issues The 500 key fob you have may stop working because it is out of range. The remote typically has a range of 30 feet or less and if it's far from your vehicle, it will not respond to your commands. This can easily be resolved by moving it closer to your vehicle until it starts responding. If you've replaced the coin battery (commonly known as”button” or “button” or “watch”) and the fob won't work, it could have an internal circuit board issue. In most cases, reprogramming the fob can resolve the issue. You can find directions on how to do this for the majority of vehicles by searching YouTube or looking through the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in their place. If they loose tension, it can prevent your coin battery from sitting properly, causing your remote to malfunction. In rare cases the fob might become desync'd with your vehicle due to software problems or hardware issues. fiat 500 key fob can fix this issue by visiting your local auto-locksmith or dealer to reprogram your key fob. In certain instances it is possible that the software will require reinstallation into your body control modules. Interference In addition to a dead battery on a coin The key fob might not be able to receive or transmit a signal due to interference. This could happen if the key fob is close to radio transmitters (cell phones and radar detectors) or another source of electromagnetic radiation. The key fob may not work because of a weak connection to the buttons or water damage, or damage to the internal chips. If your key fob suddenly stopped working, or if you have tried everything at home to fix it (e.g. You may have a faulty 500 receiver module If you've tried replacing it with a battery, reprogramming it, or using an alternative key fob. The receiver module, located under the dashboard, is able to pick up radio frequency signals from your key fob. It converts the signals into electronic commands which are then translated by the vehicle. There's a quick and easy way to reset the 500's on-board system, including the keyfob. Disconnect the battery for 15 minutes, removing first the negative cable, then the positive cable. Then, reconnect the battery. This will eliminate any remaining electricity and then restart the car's computers. This can help you the key fob to function again. If the issue continues it is recommended that you consult an expert certified technician. They will be able to determine the root of any issues.