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Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a great way to open the doors and begin the car. However, there are a variety of reasons why the key fob might stop working. This includes a dead battery, water damage, problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It must be professionally programmed (click here to find local locksmiths in the automotive industry). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob that isn't working. Modern key fobs offer limited operating range and must be within a few inches of the vehicle to work. If you are far from your vehicle, and you hit the keyfob, it will not respond and display the message “Key Fob Not Detected”. If this happens, replace the coin cell battery (Part number CR2032) with a new one from a reputable brand like Panasonic, Duracell, or Energizer. You can typically find them in your local hardware store or on the internet. You can test the battery in the coin-cell by pressing the buttons while standing close to your Fiat 500. The car will blink its parking lights and the key fob should be able to operate the lock and unlock switches. If the fob's remote doesn't function after replacing the battery, it may have water damage that prevents it from communicating with the receiver module inside your car. Water damage can happen in a variety of ways, ranging from the slightest splash to submerging the fob in salt water at the beach. If you suspect that your fob was exposed to water, put it in a rice bag to draw out the moisture. If this fails, you'll have to get your fob changed by an auto locksmith or a dealer. Water Damage Damage to the water supply can occur if you immerse the fob in the ocean or wash it in a washer. Saltwater can cause the circuit board to short and eventually cease to function. It's not good to get the fob wet, but don't give it up if you accidentally drop it in water, or fail to take it out of your pocket. First remove the battery from the fob. Clean the electronic chip using isopropyl alcohol or a similar product and then dry it completely before replacing the battery. Test the fob next to see if it is functioning. If the key does not function, it may need to be programmed again. This is usually handled by an auto locksmith or dealer. If the key you have is older and has not been programmed to work with your vehicle You will need to replace it completely. This is an easy process which can be accomplished by a professional locksmith for automotive use. The locksmith will require the key cut to match your vehicle's ignition. The locksmith also needs to reprogram your fob in the vehicle's system. This is a cheap and quick process that could be completed the same day. Receiver Module Issues The 500 key fob you have may stop working because it is out of range. The remote has a maximum range of 30 feet. Therefore, if you are too far from your car it will not respond to your commands. You can easily solve this issue by moving the remote closer to your vehicle until it responds. If you've replaced the battery in your coin (commonly known as a “button” or “watch”) and your fob still won't work it could be due to an internal circuit board problem. In fiat 500 key fob replacement , reprogramming the fob can resolve the issue. You can find directions on how to do this for most automobiles by searching YouTube or consulting the owner's manual. It is possible to replace the clips made of metal that hold the coin batteries in the correct position. If they loose tension, it could hinder the coin battery from being properly seated and can cause the remote to malfunction. In rare cases it is possible that the fob will become disconnected from your vehicle because of software or hardware issues. This could cause a significant trouble, but you could usually fix it by visiting an auto locksmith to reprogram your fob. In some cases it may be necessary to reinstall the software on your body control module, too. 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's location is in close proximity to a radio transmitter, like a cell phone or radar detector. The key fob could not work because of a weak connection to the buttons or water damage, or damage to the internal chips. If your key fob suddenly stopped working, or if you have 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, 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 then 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 battery 12 volt for approximately 15 minutes by taking off the negative cable first then the positive cable. Reconnect the battery. This will eliminate any remaining electric current, and also restart the computer of your car. This will help you get your key fob to work again. If the issue persists, you should seek out an expert technician. They will be able diagnose the root of any problems.