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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. However, there are numerous reasons why the key fob might stop functioning. This includes a dead coin-battery and water damage, as well as problems with receiver modules, as well as interference. This listing is for a NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It has to be professionally programmed (click here to find local locksmiths for automotive locksmiths). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most frequent reason for your 500 key fob not functioning. Modern key fobs have a very limited operating range and should be within some feet of the car to operate. If you are far from your vehicle and you push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this occurs then replace the battery for your coin-cell (Part Number CR2032) with a new battery of a trusted brand like Panasonic Duracell or Energizer. You can typically find them at your local hardware store, or online. You can test the battery of your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switches. If your key fob doesn't work even after replacing the battery, there may be water damage that is preventing it from connecting to the module inside your vehicle. Water damage can occur in many ways, such as a simple splash or submerging your key fob in saltwater at the beach. If you suspect your fob has been exposed to water, put it in a dry rice bag to pull the moisture back out. If where to get a fiat key cut doesn't work, the fob might require reprogramming by a professional locksmith or dealer. Water Damage Water damage can occur when you immerse the fob into the ocean or wash it in a washer. Saltwater can cause the circuit board to become shorted and eventually fail. In the event that you let your fob get wet, it's not a good idea however, if you drop it into the water in a cup or fail to take it out of your pants pocket prior to running the washer, don't give up hope. First, remove the battery. Clean the electronic chip using isopropyl alcohol or a similar product and then dry it thoroughly before replacing the battery. Check the fob again to check if it's working. If the fob doesn't work, it might need to be reset. This is typically done by a dealer or professional auto locksmith. If the key is older and has never been programmed to your car It is likely that it needs to be replaced completely. A professional locksmith for cars can do this job. The locksmith will have to cut the key to match the ignition on your vehicle. They will also need to reprogram the fob for your vehicle's system. This is an affordable and quick process that could be completed the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob could stop functioning is that it's out of range. The remote has a range of 30 feet. So should you be too far away from your vehicle, it won't respond to your commands. It's easy to fix this by moving the remote closer to your car until it responds. If your fob isn't working after replacing the battery inside the coin, which is also called a “button”, “watch” or “button” It could be due to a problem with the internal circuit board. Reprogramming the fob typically resolves this problem. You can find directions on how to do this for all vehicles by searching YouTube or consulting the owner's manual. You may have to replace the metal clips that keep the coin battery. If they loose tension, it could hinder the battery from being seated properly and can cause the remote to malfunction. In rare cases it is possible that the fob will become desync'd with your vehicle due to software or hardware issues. This could be a huge problem, but you can usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob for you. In some instances the software may require reinstallation to your body control modules. Interference Interference can also cause the key fob to not be able to receive or transmit a signal. This could occur if the key fob is close to a radio transmitter (cell phones and radar detectors) or another source of electromagnetic radiation. The key fob may not work due to a poor connection with the buttons, water damage or damage to the internal chips. If your key fob suddenly stopped working, or if you've tried everything at home to solve the issue (e.g. You might have a damaged 500 receiver module in the event that you've tried replacing the battery, reprogramming it, or using a spare key fob. The receiver module is situated under the dash, and it picks up the radio frequency signals from the key fob. It converts the signals into electronic commands, which are then read by the vehicle. Fortunately, there's an easy method to reset all of the onboard systems in your 500 device, including the key fob. Disconnect the battery for 15 minutes, removing first the negative cable and then the positive cable. Reconnect the battery. This will eliminate any remaining electric current, and also restart the computer in your car. This could help you get your key fob to function again. If the issue persists, you should speak with an expert technician. They can identify the root of any problems.