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Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob makes it simple to open doors and start your car. However, there are numerous reasons why the fob won't be working. This could be due to a dead battery or water damage, problems with the receiver modules, and interference. fiat punto key fob replacement is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to search for local automotive locksmiths). It comes with trunk, lock and unlock buttons. Dead Coin Battery A dead battery is the main reason for your 500 key fob not functioning. Modern key fobs have a very limited range of operation, and should be within a few feet of the vehicle to operate. If you're far from your vehicle and 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 happens, simply replace the coin cell battery (Part number CR2032) with a fresh one from a reputable manufacturer like Panasonic, Duracell, or Energizer. You can find them in the local hardware store or online. After you've changed the battery on the coin cell You can test it by standing next 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 fob's remote doesn't work after replacing the battery, it may be damaged by water that blocks it from communicating with the receiver module in your vehicle. Water damage can happen through a variety of methods, including an easy splash or submerging the key fob in saltwater at the beach. If you think your fob was exposed to water, you can place it in a rice bag to draw out the moisture. If that doesn't work your fob is likely to need to be reset by a professional auto locksmith or the dealer. Water Damage While the fob comes with rubber seals to keep water out of the electronic chip inside it, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater can be particularly harmful to the fob's circuit board, causing it to short out and eventually die. The fob getting wet is not an ideal idea but if you accidentally drop it into the water in a cup or don't remember to remove it from your pocket before you run the washer do not give up hope. First, remove the battery. Before replacing the battery clean the electronic chip using isopropyl or another similar product. Check the fob to check if it's working. If the key doesn't function, it may need to be changed. This is usually handled by a dealer or professional auto locksmith. If the key you have is older and is not programmed to work with your vehicle it is necessary to replace it completely. A professional locksmith in the automotive industry can carry out this simple task. The locksmith will need the key cut to match the car's ignition. They will also need to program the fob into the system of your car. This is a fast and inexpensive process that can usually be completed on the same day. Receiver Module Issues One of the most common reasons your 500 key fob might stop working is that it's simply out of range. The remote has a range of 30 feet, so if you are too 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 you've replaced the coin battery (commonly called”button” or “button” or “watch”) and the fob isn't working It could be because of an internal circuit board issue. In most cases, reprogramming the fob can resolve the issue. There are instructions 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 lose tension it can stop your coin battery from being properly seated and cause your remote to malfunction. In rare cases it is possible that the fob will become desync'd with your vehicle because of software or hardware issues. This issue can be fixed by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain instances the software might require reinstallation into your body control modules. Interference In addition to a dead coin battery the key fob could not be able to transmit or receive a signal due to interference. This could occur if the keyfob is in close proximity to a radio transmitter such as a cell phone or radar detector. Other reasons why the key fob may not function could be due to a weak connection to the buttons or damage to the internal chip, or water damage. If your key fob suddenly stopped working, or if you've tried everything at home to resolve it (e.g. replacing batteries, reprogramming or using the spare key fob, you may have a malfunctioning receiver module on your 500. The receiver module, located under the dashboard, receives radio frequency signals from your key fob. Then, 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 of 12 volts 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 then restart the car's computers, which could help the key fob to function again. If the issue continues, you should speak with an expert technician. They will be able diagnose the exact cause of any problems.