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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a handy way to unlock the doors and start the car. However, there are numerous reasons why the key fob might stop working. These include a dead coin battery, damage to the receiver module, problems, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It needs to be professionally programmed (click here to find local locksmiths in the automotive industry). This remote includes lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason that your 500 key fob doesn't function is an inactive battery. Modern key fobs only have a limited range of operation and must be within just a few inches of the vehicle to function. If you're far from your vehicle, and you press the keyfob button, it will not respond, and display the message “Key Fob Not Detected”. If this happens, replace the battery in the coin cell (Part number CR2032) with a new one from a reputable manufacturer such as Panasonic, Duracell, or Energizer. They are usually available at your local hardware store or on the internet. You can test the battery of your coin-cell by pressing the buttons while standing near your Fiat 500. The car should flash its parking lights and the key fob will operate the lock and unlock switches. If key for fiat 500 does not work after replacing the battery, there might be water damage that is preventing it from communicating with the module in your vehicle. Water damage can happen in a variety of ways, ranging from the slightest splash to submerging the fob salt water at the beach. If you suspect that your fob has been exposed to water, put it in a bag of rice to draw out the moisture. If this does not work, you'll need to have your fob replaced by an auto locksmith or a dealer. Water Damage While the fob comes with rubber seals to 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 is particularly dangerous to the circuit board of the fob, causing it to short out and eventually die. It's not a good thing to let the fob get wet however, don't give it up if you accidentally drop it in water or forget to take it out of your pants pocket. First, remove the battery. Clean the electronic chip using isopropyl or a similar product and then dry it thoroughly before replacing the battery. Then, test the fob to see if it works. If the fob doesn't work, it might need to be programmed again. This is typically done by a professional or dealer auto locksmith. If the key is more recent and has not been programmed to your vehicle It will most likely need to be replaced completely. A professional locksmith in the automotive industry can carry out this simple task. The locksmith will have to cut the key to match the ignition of your car. They will also need to reprogram the fob to the system of your car. This is a cheap and fast process that can be completed on the same day. Receiver Module Issues The 500 key fob could stop working because it is out of range. The remote has a maximum range of 30 feet, which means when you're too far from your car, it won't respond to your commands. It is possible to solve this issue by moving the remote closer to your car until it responds. If you've replaced your coin battery (commonly known as a “button” or “watch”) and your fob still won't work, it could have an internal circuit board problem. Reprogramming the fob is usually the solution to this problem. You can find the steps for the majority of vehicles on YouTube or in the owner's manual. It may be necessary to replace the clips made of metal that hold the coin batteries in their place. If they loose tension they could stop the coin battery from being properly seated and result in the malfunction of your remote. In rare cases the fob might be out of alignment with your vehicle because of software or hardware problems. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In some instances it is possible that the software will require reinstallation into your body control modules. Interference In addition to a dead coin battery, the key fob may not be able to transmit or receive an signal due to interference. This can occur when the key fob is in close proximity to a radio transmitter, like a cellphone or radar detector. The key fob may not function because of a problem to the buttons, water damage or damage to the internal chips. If your key fob suddenly stopped working, or if you have tried everything at home to resolve it (e.g. You may have a faulty 500 receiver module in the event that you've tried replacing the battery, reprogramming, and using an alternative key fob. The receiver module is situated under the dash and picks up the radio frequency signals from the key fob. Then, it converts them into electronic commands that the vehicle interprets. Fortunately, there's an easy way to reset all of the on-board systems in your 500 device, including the key fob. Disconnect the battery for 15 minutes by taking off first the negative cable, then the positive cable. Reconnect the battery. This will clear any residual electrical charge, and then restart the computer of your car. This can help you get your key fob working again. If the problem persists it is recommended that you consult an expert certified technician. They can identify the root of any issues.