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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 allows you to easily open doors and start your vehicle. There are many reasons the key fob might stop working. This could be due to a dead coin-battery, water damage, issues with the receiver module, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It must be professionally programmed (click here to search for local locksmiths for automotive locksmiths). It includes lock, unlock, and trunk buttons. Dead Coin Battery The most frequent reason why your 500 key fob doesn't function is due to a dead battery. Modern key fobs come with a limited range of operation, and must be within some feet of the vehicle to operate. If you're far away from your vehicle and you press the key fob button, the car will not respond, and will display a “Key Fob Not Detected” message in the instrument cluster. If this happens, simply replace the battery of your coin cell (Part number CR2032) with a fresh one from a reputable manufacturer like Panasonic, Duracell, or Energizer. You can find them at the 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 parking lights should flash and the key fob will operate the lock and unlock switch. If the fob's key doesn't work after replacing the battery, it may have water damage that stops it from communicating with the receiver module inside your car. Water damage can occur in a number of ways, ranging from a light splash to submerging your fob in salt water at the beach. If you believe your fob was exposed to water, you can place it in a bag of rice to draw out the moisture. If this doesn't work, you will require your fob to be replaced by an auto locksmith or dealer. Water Damage Damage to the water supply can occur if you immerse the fob into the ocean or wash it in a machine. Saltwater can cause the circuit board to become shorted and eventually end up dying. It's not the best idea to submerge the fob in water, but don't give it up even if you accidentally drop the fob in the water or don't remove it from your pants pocket. Take the battery off first. Before replacing the battery, clean the electronic chip using isopropyl, or a similar product. Then check the fob to test if it works. If the key doesn't function then it might need to be programmed again. This is usually handled by an auto locksmith or dealer. If the key is more recent and has not been programmed to your vehicle It is likely that it needs to be replaced completely. A professional automotive locksmith can do this job. The locksmith will need to cut the key to match the ignition in your vehicle. The locksmith will also need to reprogram your fob in the vehicle's system. It's a simple and cost-effective process that can usually be completed the next day. Receiver Module Issues The 500 key fob you have may not function because it's out of range. The remote usually has an area of 30 feet or less, and if it's too far from your car, it won't respond to your commands. This can be fixed by moving closer to your vehicle until it starts responding. If your fob does not work after you replace the battery for the coin, also known as a “button”, “watch” or “button”, it could be a problem with the circuit board inside. Reprogramming the fob usually resolves this problem. The instructions are available for most vehicles on YouTube or in the owner's guide. It could be necessary to replace the clips made of metal that hold the coin batteries in place. If they loose tension, they could stop the battery from being properly seated, and this will cause the remote to malfunction. In rare cases the fob could be out of sync with your vehicle because of hardware or software problems. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In some instances, the software may also require reinstallation to 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 may happen if the key fob is in close proximity to a radio transmitter, like a cell phone or radar detector. The key fob could not function due to a bad connection with the buttons or water damage, or damage to the internal chips. If the key fob has failed to work one day in the middle of the night and you've tried everything you can do at home to fix it e.g. battery replacement, reprogramming and using the spare key fob, you may have a damaged receiver module on your 500. fiat 500 key The Keylab is situated under the dash, and it picks up the radio frequency signals from the key fob. Then, it converts them into electronic commands that the vehicle interprets. There's a quick and easy way to reset the 500's in-board system, including the keyfob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Then reconnect the battery. This will remove any remaining electricity and restart the car's computer system, which could allow you to the key fob to function again. If the issue persists, you should seek the advice of an expert technician. They will be able to determine the exact cause of your problems.