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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to open the doors and begin the car. There are many reasons the fob won't work. These include a dead battery or water damage, receiver module issues, and interfering. This listing is for a NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be professionally programmed by a local locksmith (click here to search for a Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most common reason your 500 key fob will not function is an inactive battery. Modern key fobs operate with a limited operating range, and must be within just a few feet of the vehicle to function. If you are far from your vehicle, and you press the keyfob button it will not respond, and display the message “Key Fob Not Detected”. If this happens, replace the coin cell battery (Part number CR2032) with a brand new one from a reputable brand such as Panasonic, Duracell, or Energizer. They can be found in your local hardware store or on the internet. You can test the battery of your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The car should blink its parking lights, and the key fob should operate the lock and unlock switches. If the key fob doesn't work after replacing the battery, it may have water damage that stops it from communicating with the receiver module inside your car. Water damage can happen in many ways, such as an easy splash or submerging the key fob into saltwater at the beach. If you suspect that your fob has been exposed to water, you can try placing it in a dry rice bag to draw the moisture back out. If this isn't working, you'll need to have your fob replaced by an auto locksmith or a dealer. Water Damage Water damage can occur when you immerse the fob in the ocean, or wash it in a washing machine. Saltwater is particularly dangerous to the circuit board of the fob that can cause it to short out and eventually end up dying. It's not a good thing to submerge the fob in water but don't give up even if you accidentally drop the fob in the water or don't remove it from your pocket. Take the battery off first. Clean the electronic chip using isopropyl alcohol or a similar product and then dry it completely before replacing the battery. Test the fob next to check if it's functioning. If the key doesn't work, it might need to be reprogrammed. This is usually done by an auto locksmith or dealer. If your key is old and has not been programmed for your car You will need to replace it completely. This is a simple procedure that can be handled by a professional automotive locksmith. The locksmith needs to cut the key to match the ignition in your vehicle. The locksmith will also have to reprogram the fob into the car's system. This is an affordable and quick process that could be completed in the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob won't be working is because it's out of range. The remote has a maximum range of 30 feet. So should you be too far from your vehicle it won't respond to your commands. You can easily solve this problem by moving the remote closer to your car until it responds. If you've replaced your coin battery (commonly known as a “button” or “watch”) and your fob doesn't function It could be because of an internal circuit board problem. Reprogramming your fob can resolve this problem. fiat key fob replacement can find the steps for most vehicles on YouTube or in the owner's guide. You may need to replace the metal clips that hold the coin battery in place. If they loose tension, it could prevent your coin battery from being properly seated, causing your remote to malfunction. In rare cases, the fob may become disconnected from your vehicle due to software or hardware issues. This can cause a major problem, but you can usually fix it by visiting a local dealer or auto locksmith to have them reprogram your fob for you. In some instances it may be necessary to reinstall the software on your body control module as well. Interference In addition to a dead coin battery the key fob could not be able to receive or transmit the signal due to interference. This can happen when the key fob is close to radio transmitters (cell phones or radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob might not work include a poor connection to the buttons or the internal chip, or water damage. If your key fob suddenly stopped working, or if you have tried everything at home to fix it (e.g. replacing the battery, reprogramming, and using the spare key fob, it could have a defective receiver module on your 500. The receiver module is situated under the dash and is able to pick up the radio frequency signals from the key fob. Then, it converts them into electronic commands that the vehicle interprets. There's a quick and easy way to reset the 500's onboard system, including the keyfob. Disconnect the battery 12 volt for about 15 minutes, by removing the negative cable first then the positive cable. Then, reconnect the battery. This will remove any remaining electricity, and allow you to restart the computer in your car. This will help you get your key fob to work again. If the issue continues, you should speak with an expert technician. They'll be able determine the exact cause of your issue.