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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a great way to open the doors and begin the car. There are many reasons the fob may stop working. This includes a dead coin-battery, water damage, receiver modules issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be programmed professionally by a local automotive locksmith (click here for Locksmith Search). Includes trunk, lock and unlock buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob not functioning. Modern key fobs operate with a limited operating range, and must be within a few feet of the vehicle in order to function. If you are not within your vehicle and 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) by a fresh one of a trusted brand such as Panasonic Duracell or Energizer. They are typically available at your local hardware store or on the internet. You can test the battery in the coin-cell by pressing the buttons while you're standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switch. If the key fob won't function after replacing the battery, it might be damaged by water that blocks it from connecting to the receiver module inside your vehicle. keyless entry can occur in a variety of ways, ranging from a light splash to submerging the fob into salt water at the beach. If you suspect that your fob has been exposed to water, put it in a rice bag to draw out the moisture. If this isn't working, you'll have to get your fob changed by an auto locksmith or dealer. Water Damage While the fob has some rubber seals that keep water from the chip's electronic circuit, submerging it in the ocean or washing it in a machine could cause water damage. 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 a good idea however, if you drop it into a glass of water or forget to take it out of your pocket before you run the washer Don't give up hope. Take the battery off first. Clean the electronic chip using isopropyl alcohol or another similar product and dry it completely before replacing the battery. Then, test the fob to verify if it is working. If the key doesn't function, it may need to be changed. This is usually done by an auto locksmith or dealer. If your key is older and not programmed for your vehicle, you will need to replace it completely. A professional automotive locksmith can complete this simple process. The locksmith must cut the key to match the ignition of your vehicle. They'll also have to reprogram the fob for your vehicle's system. This is a cost-effective and quick procedure that can be completed the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob could stop functioning is because it's out of range. The remote typically has a range of 30 feet or less, and if it's too far from your car, it will not respond to your commands. You can easily remedy this by moving your remote closer to your car until it responds. If your fob doesn't work after replacing the battery for the coin, also known as a “button”, “watch” or “button” or “button”, it could be due to an issue with the internal circuit board. In most cases, reprogramming the fob will resolve this problem. The instructions are available for the majority of vehicles on YouTube or in the owner's manual. It's possible that you need to replace the metal retaining clips that hold the coin battery. If they loose tension it could prevent the coin battery from being properly seated, and this will cause your remote to malfunction. In rare cases the fob could be out of the vehicle's sync because due to hardware or software issues. This can cause a major issue, but you are able to often fix this by visiting an auto locksmith to have them reprogram your fob for you. In certain instances the software may require reinstallation in your body control modules. Interference In addition to a dead battery on a coin The key fob may not be able to receive or transmit signals due to interference. This can occur when the keyfob is in close proximity to a radio transmitter like a cellphone or radar detector. Other reasons why the key fob could not function could be due to a weak connection to the buttons, damage to the internal chip or water damage. If the key fob suddenly stopped working, in the middle of the night, or after trying everything you can do at home to fix it e.g. replacing the battery, reprogramming it and using the spare key fob, you may have a malfunctioning receiver module on your 500. The receiver module, located under the dashboard, receives radio frequency signals from your key fob. It transforms the signals into electronic commands which are then interpreted by the vehicle. Fortunately, there's an easy method of resetting every single system on board in your 500, including the key fob. Disconnect the battery for 15 minutes by taking off first the negative cable, then the positive cable. Reconnect the battery. This will erase any remaining electricity, and allow you to restart the computer in your car. This can help you get your key fob working again. If the problem persists you should speak with a certified technician. They will be able to identify the root cause of your problem.