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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 makes it simple to open doors and start your vehicle. However, there are numerous reasons why the fob won't be working. This includes a dead battery and water damage, as well as problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It must be professionally programmed (click here to find local locksmiths for automotive locksmiths). This remote includes lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason why your 500 key fob won't function is an inactive battery. Key fobs of today have limited operating range and must be within just a few inches of the vehicle to work. If you're far from your vehicle and you press the key fob button, the car won't respond and will display an “Key Fob Not Detected” message in the instrument cluster. If this occurs If this happens, replace the battery in the coin-cell (Part Number CR2032) by a fresh one of a reputable brand such as Panasonic Duracell or Energizer. You can usually find them in your local hardware store, or online. After you've replaced the battery of your coin cell, you can test it by standing close to your Fiat 500 and pressing the buttons. The parking lights should blink and the key fob will operate the lock and unlock switch. If the key fob won't work after replacing the battery, it might be damaged by water that blocks it from communicating with the receiver 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 your fob was exposed to water, put it in a dry rice bag to pull the moisture back out. If this does not work, you'll require your fob to be replaced by an auto locksmith or a dealer. Water Damage While the fob comes with rubber seals that keep water out of the chip's electronic circuit and out of the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short and then fail. It's not a good idea to submerge the fob in water however, don't give it up if you accidentally drop it in water or forget to remove it from your pocket. First remove the battery from the fob. Before replacing the battery clean the electronic chip with isopropyl, or a similar product. Next check the fob to verify if it is working. If the fob doesn't work, it may have to be programmed again. This is typically done by a professional or dealer auto locksmith. If the key is more recent and was not programmed to your vehicle It is likely that it needs to be replaced completely. A professional locksmith in the automotive industry can complete this simple process. The locksmith will need to cut the key to match the ignition of your vehicle. They'll also need to reprogram the fob in the system of your car. This is a low-cost and quick process that could be completed on the same day. Receiver Module Issues Your 500 key fob might stop working because it is out of range. The remote typically has an area of 30 feet or less and if it's far away from your car it will not respond to your commands. This can easily be resolved by moving it closer to your vehicle until it starts responding. If you've replaced your coin battery (commonly called a “button” or “watch”) and the fob won't work It could be because of an internal circuit board problem. Reprogramming the fob is usually the solution to the issue. You can find instructions on how to do this for the majority of automobiles by searching YouTube or checking out the owner's manual. You may need to replace the metal retaining clips that keep the coin battery. If they lose tension it can prevent the battery from being seated properly and can result in the malfunction of your remote. In rare cases it is possible that the fob will become disconnected from your vehicle because of software or hardware issues. This can be a major problem, but you can often fix this by visiting a local dealer or auto locksmith to have them reprogram your fob. In some cases, the software may also require reinstallation to your body control modules. Interference Interference can also cause the key fob to not be able to receive or transmit signals. This could occur if the key fob is in proximity to radio transmitters (cell phones and radar detectors) or another source of electromagnetic radiation. The key fob may not function due to a bad connection with the buttons water damage or damage to the internal chips. If your key fob suddenly stopped working, or you've tried everything at home to fix it (e.g. replacing batteries, reprogramming or using the spare key fob, it could have a faulty 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. It converts them into electronic commands that the vehicle interprets. There is a simple way to reset the 500's on-board system, including the keyfob. Disconnect replacement fiat 500 key for 15 minutes by removing first the negative cable, then the positive cable. Reconnect the battery. This will clear out any remaining electricity and restart the car's computers. This can help the key fob to function again. If the problem persists you should speak with an expert technician. They will be able to determine the exact cause of problems.