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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 is a convenient way to open the doors and begin the car. There are a myriad of reasons the fob could stop functioning. These include a dead battery or damage to the receiver module, issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote – look-alike Ilco brand that must be programmed professionally by a local locksmith (click here for Locksmith Search). Includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob being inoperative. Modern key fobs come with a restricted operating range, and must be within only a few feet from the vehicle to function. If you're far from your car and press the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this happens then replace the battery for your coin-cell (Part Number CR2032) with a new battery from a reputable brand such as Panasonic Duracell or Energizer. You can find them at your local hardware store or on the internet. You can test the battery on your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The car will flash its parking lights and the key fob should operate the lock and unlock buttons. If the fob's key doesn't function after replacing the battery, it might have water damage that stops it from connecting to the receiver module inside your car. Water damage can occur in a number of ways, from the slightest splash to submerging your fob in salt water at the beach. If you suspect your fob was exposed to water, try putting it in a dry rice bag to pull the moisture back out. If this doesn't work, your fob may need to be reset by a professional locksmith or dealer. Water Damage Although the fob is equipped with rubber seals that keep water out of the chip's electronic circuit it, submerging it in the ocean or washing it in a machine could cause water damage. The Keylab can be particularly harmful to the fob's circuit board and can cause it to short out and eventually die. It's not a good thing to let the fob get wet however, but don't give it up when you accidentally drop it in water or fail to remove it from your pants pocket. First, remove the battery. Before replacing the battery clean the electronic chip with isopropyl, or a similar product. Next try the fob and check if it functions. If the key doesn't work, it might need to be programmed again. This is usually handled by an auto locksmith or dealer. If your key is older and is not programmed for your vehicle then you'll need to replace it completely. A professional locksmith for automotive can complete this simple process. The locksmith will need to cut the key to match the ignition on your vehicle. The locksmith will also have to reprogram the fob into the vehicle's system. This is a cheap and quick procedure that can be completed in the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob may stop working is 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 be fixed by moving closer to your vehicle until it begins responding. If you've replaced your coin battery (commonly known as a “button” or “watch”) and the fob won't work it could be due to an internal circuit board problem. In the majority of cases, reprogramming your fob will resolve this problem. You can find the procedure for the majority of vehicles on YouTube or in the owner's guide. It could be necessary to replace the metal clips that hold the coin batteries in place. If they lose tension it could prevent the battery from being seated properly, and this will cause the remote to malfunction. In rare cases the fob could be out of sync with your vehicle because of software or hardware problems. This could be a huge trouble, but you could often fix this by visiting an auto locksmith to reprogram your fob. In some cases they may have to reinstall the software on your body control module as well. Interference In addition to a dead battery on a coin, the key fob may not be able to transmit or receive an signal due to interference. This can happen when the key fob is located near the radio transmitter (cell phones or radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob could not function could be due to a weak connection to the buttons or the internal chip, or water damage. If the key fob has been unable to function for a while in the middle of the night, or after trying every option at home to fix it e.g. replacing the battery, reprogramming, and using the spare key fob, you may have a defective receiver module on your 500. The receiver module, located beneath the dashboard, detects radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets. There's a simple method to reset the 500's internal system including the keyfob. Disconnect the 12 volt battery for approximately 15 minutes by taking off the negative cable first then the positive cable. Reconnect the battery. This will erase any remaining electric current, and also restart the computer in your car. This can help get your key fob to work again. If the issue persists, you should seek out an expert technician. They will be able to identify the root cause of your issues.