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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a convenient method to open the doors and begin the car. However, there are many reasons the fob could stop working. This includes a dead coin-battery, water damage, problems with receiver modules, as well as interference. This listing is for an NEW replacement Fiat Flip Key Remote – look-alike Ilco brand that must be professionally programmed by a local locksmith (click here to search for a Locksmith Search). It comes with trunk, lock and unlock buttons. Dead Coin Battery The most frequent reason why your 500 key fob won't work is an inactive battery. Modern key fobs have a limited range of operation and must be within just a few inches of the vehicle to function. If you're far from your vehicle, and you press the key fob button, the car won't be able to respond, and will display an “Key Fob Not Detected” message in the instrument cluster. If this occurs, replace the coin-cell battery (Part Number CR2032) with a new battery of a reputable brand such as Panasonic Duracell or Energizer. You can find them at your local hardware store, or online. You can test the battery on your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switches. If your fob's key isn't working even after replacing the battery, it may be water damage which prevents it from communicating with the module inside your vehicle. Water damage can happen in a variety of ways, from an accidental splash to submerging the fob salt water at the beach. If you believe your fob was exposed to water, put it in a rice bag to draw out the moisture. If that doesn't work, your fob may require reprogramming by an experienced auto locksmith or the dealer. Water Damage While the fob comes with rubber seals that keep water from the electronic chip inside it, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to become shorted and eventually die. Getting the fob wet is not an ideal idea, but if you drop it in the water in a cup or forget to remove it from your pocket before you run the washing machine, don't give up hope. First take the battery off the fob. Clean the electronic chip using isopropyl or a similar product and dry it completely before replacing the battery. Check G28 Car Keys to determine if it's functioning. If the fob doesn't function, it may need to be programmed again. This is typically done by a professional or dealer auto locksmith. If the key is more recent and has never been programmed to your vehicle it is likely to need to be replaced completely. This is a straightforward process that can be carried out by a professional locksmith for automotive use. The locksmith will need to cut the key to match the ignition in your vehicle. The locksmith will also need to reprogram your fob into the vehicle's system. It's a simple and inexpensive process which can be completed in the next day. Receiver Module Issues The 500 key fob could not work because it's out of range. The remote typically has an operating range 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 it closer to your vehicle until it starts responding. If you've replaced the coin battery (commonly called”button” or “button” or “watch”) and your fob still won't work it could be due to an internal circuit board issue. In the majority of cases, reprogramming your fob will resolve this problem. You can find the instructions for the majority of vehicles on YouTube or in 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 loose tension, it could prevent the battery from being properly seated and cause your remote to malfunction. In rare cases the fob can become out of the vehicle's sync because of software or hardware problems. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain situations it may be necessary to reinstall the program in your body control module too. Interference In addition to a dead coin battery the key fob could not be receiving or transmitting signals due to interference. This could occur if the keyfob's location is in close proximity to a radio transmitter, such as a cell phone or radar detector. The key fob might not function due to a poor connection with the buttons, water damage or damage to the internal chips. If the key fob has suddenly stopped working, without notice, or after trying everything you can do at home to resolve it e.g. replacing batteries, reprogramming or using the spare key fob, you might have a defective receiver module on your 500. The receiver module, located beneath the dashboard, receives radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets. Fortunately, there's an easy method to reset all on-board systems in your 500, including the key fob. Disconnect the battery 12 volt for about 15 minutes by removing the negative cable and then the positive cable. Then, reconnect the battery. This will eliminate any remaining electrical charge, and then restart the computer in your car. This can help get your key fob to work again. If the issue persists it is recommended that you consult an expert certified technician. They can determine the root of your problems.