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Reasons Your Fiat 500 Key Fob Won't Work A key fob for Fiat 500 makes it simple to open doors and start your car. There are a variety of reasons why the fob may stop working. This includes a dead battery and water damage, as well as receiver modules issues, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It has to be professionally programmed (click here to find local automotive locksmiths). It includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most frequent cause of your 500 key fob not working. Modern key fobs have a very restricted operating range, and must be within a few feet of the car to operate. If you are further away from your vehicle and you press the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this happens you need to replace the battery of your coin-cell (Part Number CR2032) with a new battery of a reputable brand such as Panasonic Duracell or Energizer. They are available at the local hardware store or online. You can test the coin-cell battery by pressing the buttons while you're standing close to your Fiat 500. The car should flash its parking lights and the key fob should operate the lock and unlock switches. If your fob's key doesn't work even after replacing the battery, there might be water damage that has prevented it from interacting with the module inside your vehicle. Water damage can occur in a variety of ways, from an accidental splash to submerging the fob salt water at the beach. If you suspect that your fob has been exposed to water, you can place it in a rice bag to draw out the moisture. If this doesn't work your fob will probably need to be reprogrammed by an experienced auto locksmith or by the dealer. Water Damage Water damage can happen if you immerse the fob in the ocean, or wash it in a machine. Saltwater is especially dangerous to the circuit board of the fob, causing it to short out and eventually die. In the event that you let your fob get wet, it's not an ideal idea, but if you drop it into the water in a cup or fail to remove it from your pants pocket before running the washing machine Don't give up hope. First, remove the battery from the fob. Clean the electronic chip using isopropyl alcohol or another similar product and dry it thoroughly before replacing the battery. Then check the fob to see if it works. If the key doesn't work, it may need to be reset. This is usually handled by a professional or dealer auto locksmith. If the key is newer and has never been programmed to your vehicle It will most likely need to be replaced completely. A professional automotive locksmith can complete this simple process. The locksmith must cut the key to match the ignition of your vehicle. They will also need to reprogram the fob in your car's system. This is a simple and inexpensive process that can usually be completed within the same day. Receiver Module Issues Your 500 key fob may be inoperable because it's out of range. The remote's range is of 30 feet. So should you be too far away from your vehicle, it won't respond to your commands. This can easily be resolved by moving it closer to your vehicle until it begins responding. If your fob won't work after you replace the battery for the coin, also known as a “button”, “watch” or “button” it may be due to a malfunction on the internal circuit board. In the majority of cases, reprogramming your fob will resolve this problem. You can find the instructions for most vehicles on YouTube or in the owner's manual. It is sometimes necessary to replace the clips made of metal that hold the coin batteries in place. If they loose tension, it can prevent the coin battery from sitting properly and cause your remote to malfunction. In rare instances, the fob could be out of sync with your vehicle because due to hardware or software issues. This can be a major problem, but you can usually fix it by visiting an auto locksmith to reprogram your fob for you. In some instances it is possible that the software will require reinstallation to your body control modules. Interference Interference can also cause the key fob not to receive or transmit the signal. This could happen if the key fob is located near an electronic radio transmitter (cell phones and radar detectors) or another source of electromagnetic radiation. The key fob might not function because of a weak connection with the buttons water damage or damage to the internal chip s. If the key fob been unable to function for a while without notice, or after trying everything you can do at home to fix it e.g. replacing batteries, reprogramming or using the spare key fob, you might have a faulty receiver module on your 500. The receiver module is located under the dash and receives the radio frequency signals from the key fob. It converts them into electronic commands that the vehicle interprets. There is a simple way to reset the 500's in-board system, including the keyfob. Disconnect the 12 volt battery for about 15 minutes, by taking off the negative cable first then the positive cable. Then, reconnect the battery. This will clear any residual electricity, and restart the computer in your car. This can help get your key fob to function again. If the issue continues, you should seek the advice of an expert technician. They can determine the exact cause of your issue.