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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 is a convenient method to unlock the doors and start the car. There are many reasons why the fob could stop working. This could be due to a dead coin-battery, water damage, issues with the receiver module, and interference. This listing is for a NEW replacement Fiat Flip Key Remote – look-alike Ilco brand that must be professionally programmed by a local automotive locksmith (click here for Locksmith Search). It includes trunk, lock and unlock buttons. Dead Coin Battery The most frequent reason why your 500 key fob doesn't function is due to a dead battery. Key fobs of today have an operating range that is limited and must be within a few inches of your vehicle to function. If you are further away from your vehicle and push the keyfob button it won't 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 fresh one from a trusted brand like Panasonic, Duracell, or Energizer. They can be found in your local hardware store, or on the internet. You can test the battery of your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights will flash and the key fob will operate the lock and unlock switch. If the fob's key doesn't function after replacing the battery, it might be damaged by water that blocks it from communicating with the receiver module in your vehicle. Water damage can occur in many ways, including a simple splash or submerging the key fob saltwater at the beach. If you suspect that your fob was exposed to water, you can try placing it in a dry rice bag to pull the moisture out. If this doesn't work, your fob will probably require reprogramming by a professional locksmith or dealer. Water Damage While the fob has some rubber seals to keep water out of the electronic chip inside, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater is especially dangerous to the fob's circuit board that can cause it to short out and eventually die. It's not good to get the fob wet but don't give up when you accidentally drop it in water or fail to remove it from your pocket. First take the battery off the fob. Clean fiat 500 keys with isopropyl ethanol or a similar product and dry it completely before replacing the battery. Test the fob next to verify if it's working. If the key isn't working, it may need to be programmed again. This is usually handled by an auto locksmith or dealer. If the key is newer and has not been programmed to your car, it will likely need to be replaced completely. This is a simple process that can be handled by a professional locksmith for automotive use. The locksmith will require the key cut to match the car's ignition. The locksmith also needs to reprogram your fob in the vehicle's system. This is a cheap and quick process that can be completed in the same day. Receiver Module Issues Your 500 key fob may not function because it's out of range. The remote's range is of 30 feet. Therefore, if you are too far from your vehicle it will not respond to your commands. It's easy to remedy this by moving your remote closer to your car until it responds. If your fob isn't working after replacing the battery for the coin, also known as a “button”, “watch” or “button”, it may be due to a malfunction on the circuit board inside. In most cases, reprogramming the fob will resolve this issue. You can find the instructions for most vehicles on YouTube or in the owner's guide. You may need to replace the metal clips that hold the coin battery in place. If they lose tension it could hinder the battery from being seated properly and cause your remote to malfunction. In rare instances, the fob can become out of sync with your vehicle because due to hardware or software issues. This can cause a major problem, but you can often fix this by visiting an auto locksmith to reprogram your fob. In certain instances they might need to reinstall the program in your body control module, as well. Interference In addition to a dead battery on a coin The key fob might not be receiving or transmitting signals due to interference. This can happen when the key fob is in proximity to an electronic radio transmitter (cell phones and radar detectors) or any other source of electromagnetic radiation. The key fob might not function because of a problem 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 fix it (e.g. You may have a faulty 500 receiver module If you've tried replacing it with a battery, reprogramming, and using a spare key fob. The receiver module is situated under the dash and receives the radio frequency signals from the key fob. It transforms the signals into electronic commands, which are then translated by the vehicle. There's a quick and easy way to reset the 500's onboard system including the keyfob. Disconnect the battery for 15 minutes, removing first the negative cable and then the positive cable. Reconnect the battery. This will remove any remaining electricity, and allow you to restart the computer of your car. This can help get your key fob to work again. If the problem persists you should seek out an expert technician. They can identify the exact cause of problems.