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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 allows you to easily open doors and start your vehicle. There are a variety of reasons why the fob may stop working. These include a dead coin battery damage to the receiver module, water problems, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It needs to be professionally programmed (click here to search for local automotive locksmiths). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most common reason your 500 key fob won't work is a dead battery. Modern key fobs come with a limited operating range and must be within some feet of the vehicle to function. If you are far from your vehicle and you push the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this happens, simply replace the battery on your coin cell (Part number CR2032) by a new one from a reputable manufacturer like Panasonic, Duracell, or Energizer. They can be found in the local hardware store or on the internet. You can test the battery in the coin-cell by pressing the buttons while standing near your Fiat 500. The car should blink its parking lights and the key fob should be able to operate the lock and unlock switches. If the key fob doesn't function after replacing the battery, it might be damaged by water, which prevents it from communicating with the receiver module inside your vehicle. Water damage can happen in a variety of ways, ranging from a light splash to submerging your fob in salt water at the beach. If you suspect that your fob was exposed to water, put it in a dry rice bag to draw the moisture out. If this doesn't work, your fob will probably require reprogramming by a professional auto locksmith or the dealer. Water Damage Damage to the water supply can occur if you submerge the fob in the ocean or wash it in a washing machine. Saltwater is particularly dangerous to the fob's circuit board that can cause it to short out and eventually die. If you get the fob wet, it's not an option but if you accidentally drop it in a cup of water or do not remember to take it out of your pants pocket prior to running the washing machine do not give up hope. Take the battery off first. Clean the electronic chip with isopropyl or a similar product and then dry it completely before replacing the battery. Next, test the fob to verify if it is working. If the key isn't working, it may have to be changed. This is typically done by a professional or dealer auto locksmith. If your key is older and has not been programmed for your vehicle then you'll need to replace it completely. This is a simple process that can be handled by a professional locksmith for automotive use. The locksmith needs to cut the key to match the ignition in your vehicle. They'll also need to program the fob into your vehicle's system. This is a cost-effective and fast process that can be completed the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob could stop working is that it's simply out of range. The remote usually has a range of 30 feet or less and if it's far 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 your fob doesn't work after replacing the battery inside the coin, which is also called a “button”, “watch” or “button” or “button”, it could be a problem with the internal circuit board. In most cases, reprogramming the fob can resolve the problem. replacement fiat 500 key can find the instructions on how to do this on the majority of automobiles by searching YouTube or looking through the owner's manual. It's possible that you need to replace the metal clips that hold the coin battery in place. If they lose tension, it can stop your coin battery from being properly seated and cause your remote to malfunction. In rare instances it is possible that the fob will become desync'd with your vehicle due to software problems or hardware issues. This can be a major issue, but you are able to frequently fix this issue by visiting an auto locksmith to reprogram your fob for you. In certain situations they may have to reinstall the software in your body control module as well. Interference Interference can also cause the key fob not to receive or transmit an signal. This could occur if the key fob is in close proximity to a radio transmitter like a cellphone or radar detector. The key fob could not work due to a poor connection to the buttons, water damage or damage to the internal chips. If the key fob has stopped working one day without notice or even after trying everything you can at home to resolve it e.g. You might have a damaged 500 receiver module if you've tried replacing the battery, reprogramming, or using a spare key fob. The receiver module, located beneath the dashboard, is able to pick up radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets. There is a simple 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 car's computer. This will help you get your key fob to work again. If the issue continues you should seek out a certified technician. They will be able diagnose the root cause of any problems.