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Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a convenient way to unlock the doors and get started the car. However, there are a variety of reasons why the fob won't be working. This includes a dead battery or water damage, receiver modules issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be professionally programmed by a local automotive locksmith (click here to search for a Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most common cause of your 500 key fob not functioning. Modern key fobs operate with a restricted operating range, and should be within a few feet of the vehicle in order to function. If you're far from your vehicle and you hit the keyfob, it won't respond and display the message “Key Fob Not Detected”. If this occurs then replace the battery for your coin-cell (Part Number CR2032) by a brand new one of a trusted brand like Panasonic Duracell or Energizer. You can find them at the local hardware store or on the internet. You can test the coin-cell battery by pressing the buttons while you're standing close to your Fiat 500. The car should flash its parking lights and the key fob should operate the lock and unlock switches. If your fob's key isn't working even after replacing the battery, there could be water damage that prevents it from connecting to the module inside your vehicle. Water damage can occur in a variety of ways, ranging from the slightest splash to submerging your fob in salt water 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 have to get your fob 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 washer. Saltwater can cause the circuit board to short, and eventually cease to function. The fob getting wet is not a good idea however, if you drop it in a glass of water or fail to remove it from your pants pocket before running the washing machine, don't give up hope. Take the battery off first. Clean the electronic chip using isopropyl alcohol or another similar product and dry it completely before replacing the battery. Then test the fob to check if it functions. If the key does not function, it may have to be programmed again. This is usually done by an auto locksmith or dealer. If your key is older and is not programmed to work with your vehicle then you'll need to replace it completely. A professional locksmith in the automotive industry can complete this simple process. The locksmith will need to cut the key to match the ignition in your vehicle. The locksmith will also have to reprogram the fob into the car's system. This is a cheap and fast process that can be completed on the same day. Receiver Module Issues Your 500 key fob may not work because it's out of range. The remote's range is of 30 feet, so should you be too far away from your vehicle it will not respond to your commands. It can be solved by moving closer to your vehicle until it begins responding. If you've replaced the coin battery (commonly known as a “button” or “watch”) and the fob isn't working, it could have an internal circuit board problem. Reprogramming replacement fiat key fob can resolve the issue. You can find the instructions on how to do this for all vehicles by searching YouTube or checking out the owner's manual. It's possible that you need to replace the metal clips that keep the coin battery in place. If they become loose, it can prevent your coin battery from being properly seated, causing your remote to malfunction. In rare cases the fob may be out of connection with your vehicle as a result of software or hardware problems. This could cause a significant headache, but you can usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob. In some instances the software might require reinstallation in your body control modules. Interference In addition to a dead coin battery The key fob may not be able to receive or transmit signals due to interference. This could occur if the keyfob is located in close proximity to a radio transmitter, such as a cell phone or radar detector. The key fob might not work because of a problem to the buttons, 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. replacing batteries, reprogramming or using the spare key fob, you could have a defective receiver module on your 500. The receiver module is located under the dash, and it picks up the radio frequency signals from the key fob. It converts them to electronic commands that the vehicle interprets. Fortunately, there's an easy method of resetting every single system on board in your 500 keys, including the key fob. Disconnect the battery 12 volt for approximately 15 minutes by removing the negative cable and then the positive cable. Then, reconnect the battery. This will erase any remaining electric current, and also restart the computer in your car. This can help you get your key fob to function again. If the issue continues, you should consult an expert technician. They'll be able to diagnose the exact cause of your problems.