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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a convenient method to unlock the doors and get started the car. There are many reasons the fob may stop working. This could be due to a dead coin battery water damage, receiver module issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be programmed professionally by a local locksmith (click here for Locksmith Search). This remote includes lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason why your 500 key fob doesn't work is a dead battery. Key fobs of today have an operating range that is limited and must be within a few inches of the vehicle to function. If you are further away from your car and push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this happens, simply replace the battery of your coin cell (Part number CR2032) with a new one from a trusted brand like Panasonic, Duracell, or Energizer. You can usually find them in your local hardware store, or online. You can test the battery of your coin-cell by pressing the buttons while standing near your Fiat 500. The car should blink its parking lights and the key fob will operate the lock and unlock switches. If the key fob doesn't work after replacing the battery, it might be damaged by water, which prevents it from communicating with the receiver module inside your car. Water damage can occur in many ways, such as the simple splash or submerging the key fob into saltwater at the beach. If you think your fob was exposed to water, place it in a bag of rice to draw out the moisture. If this does not work, you'll need to have the fob reprogrammed either by an auto locksmith or dealer. Water Damage Although the fob is equipped with rubber seals that keep water out of the electronic chip inside and out of the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short and then cease to function. Getting the fob wet is not a good idea, but if you drop it in a glass of water or don't remember to take it out of your pants pocket prior to running the washing machine and you don't have a chance, don't give in. First remove the battery from the fob. Before replacing the battery clean the electronic chip using isopropyl or another similar product. Check the fob to verify if it's working. If the key does not function then it might need to be reprogrammed. This is usually handled by an auto locksmith or dealer. If your key is old and is not programmed to work with your vehicle then you'll need to replace it completely. This is a straightforward process that can be handled by a professional automotive locksmith. The locksmith will need to cut the key to match the ignition of your car. fiat punto key replacement needs to reprogram your fob in the vehicle's system. This is a cost-effective and quick procedure that can be completed in the same day. Receiver Module Issues Your 500 key fob may stop working because it is out of range. The remote usually has an area of 30 feet or less and if it's far from your car, it will not respond to your commands. This can be fixed by moving it closer to your vehicle until it begins responding. If you've replaced your coin battery (commonly called a “button” or “watch”) and your fob still won't work it could be due to an internal circuit board issue. In most cases, reprogramming the fob will solve the problem. You can find the instructions on how to do this for most vehicles by searching YouTube or consulting the owner's manual. It's possible that you need to replace the metal retaining clips that hold the coin battery. If they loose tension, they could stop the battery from being seated properly and cause your remote to malfunction. In rare cases the fob might be out of the vehicle's sync because of hardware or software problems. You can fix this problem by visiting your local auto-locksmith or dealer to reprogram your key fob. In certain instances the software might require reinstallation into your body control modules. Interference Interference can also cause the key fob to not receive or transmit the signal. This can occur when the key fob is in close proximity to a radio transmitter like a cell phone or radar detector. The key fob may not function due to a bad connection with the buttons water damage or damage to the internal chips. If the key fob failed to work one day without notice and you've tried everything you can at home to resolve it e.g. replacing batteries, reprogramming or using the spare key fob, you could have a damaged receiver module on your 500. The receiver module, located beneath the dashboard, receives radio frequency signals from your key fob. It converts the signals into electronic commands, which are then interpreted by the vehicle. There's a quick and easy way to reset the 500's on-board system, including the keyfob. Disconnect the battery 12 volt for approximately 15 minutes by removing the negative cable first then the positive cable. Then, reconnect the battery. This will clear out any residual electricity and restart the car's computers. This could allow you to the key fob to function again. If the issue continues, you should seek out an expert technician. They can identify the root cause of any issues.