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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 myriad of reasons why the fob won't be working. It could be due to a dead battery or damaged receiver module, water damage issues, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It has to be professionally programmed (click here to find local locksmiths for your vehicle). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason why your 500 key fob won't function is the battery is dead. Modern key fobs operate with a limited operating range, and must be within some feet of the vehicle in order to function. If you are further away from your vehicle, and you push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this happens, simply replace the coin cell battery (Part number CR2032) with a new one from a reputable brand like Panasonic, Duracell, or Energizer. They are available at your local hardware store, or online. You can test the battery on your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The parking lights should flash and the key fob will operate the lock and unlock switches. If the key fob won't work after replacing the battery, it may be damaged by water, which prevents it from communicating with the receiver module in your vehicle. Water damage can happen in many ways, including the simple splash or submerging the key fob saltwater at the beach. If you suspect that your fob was exposed to water, put it in a dry rice bag to draw the moisture back out. If this doesn't work the fob might require reprogramming by a professional locksmith or dealer. Water Damage While the fob has some rubber seals to keep water out of the chip's electronic circuit, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater poses a particular risk to the circuit board of the fob which causes it to short out and eventually die. The fob getting wet is not an ideal choice but if you drop it in an empty cup of water, or forget to remove it from your pants pocket prior to running the washing machine Don't give up hope. First, remove the battery from the fob. Before replacing the battery, clean the electronic chip using isopropyl or a similar product. Then try the fob and verify if it is working. If the key does not work, it may have to be reprogrammed. This is typically handled by a professional or dealer auto locksmith. If the key is newer and has not been programmed to your vehicle it is likely to need to be replaced completely. fiat 500 key fob replacement can carry out this simple task. The locksmith will need the key cut to match your car's ignition. The locksmith also needs to reprogram your fob in the car's system. This is a low-cost and fast process that can be completed within the same day. Receiver Module Issues One of the most common reasons your 500 key fob won't be functioning is because it's out of range. The remote has a range of 30 feet, so when you're too far from your vehicle it will not respond to your commands. This can be easily fixed by moving it closer to your vehicle until it starts responding. If you've replaced the coin battery (commonly known as a “button” or “watch”) and your fob doesn't function it could be due to an internal circuit board issue. Reprogramming the fob usually resolves this issue. You can find instructions on how to do this on the majority of automobiles by searching YouTube or reading the owner's manual. It is possible to replace the metal clips that hold the battery of your coin in place. If they lose tension, it may prevent your battery from sitting properly and cause your remote to malfunction. In rare cases it is possible that the fob will become desync'd with your vehicle due to software or hardware issues. This could cause a significant issue, but you are able to frequently fix this issue by visiting an auto locksmith to have them reprogram your fob. In certain instances it may be necessary to reinstall the program in your body control module as well. Interference Interference can also cause the key fob to be unable to receive or transmit signals. This could occur if the key fob is in proximity to radio transmitters (cell phones, radar detectors) or any other source of electromagnetic radiation. The key fob may not function because of a weak connection with 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 resolve it (e.g. It could be a defective 500 receiver module in the event that you've tried replacing the battery, reprogramming or using an alternative key fob. The receiver module is located under the dash and picks up the radio frequency signals from the key fob. It converts the signals into electronic commands which are then translated by the vehicle. Fortunately, there's an easy way to reset all of the on-board systems in your 500 keys, including the key fob. Disconnect the 12 volt battery for about 15 minutes, by removing the negative cable and then the positive cable. Then, reconnect the battery. This will get rid of any remaining electricity and then restart the car's computer system, which can help you the key fob to function again. If the problem persists you should seek out an experienced technician. They will be able to determine the root cause of any issues.