Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob makes it simple to open doors and start your car There are many reasons the key fob might stop working This could be due to a dead coin battery, damaged receiver module, water damage issues, and interference This listing is for a NEW replacement Fiat Flip Key Remote - an exact replica of the Ilco brand that must be professionally programmed by a local automotive locksmith click here for Locksmith Search This remote includes trunk, lock and unlock buttons Dead Coin Battery A dead battery is the most frequent reason for your 500 key fob not functioning Key fobs of today have an operating range that is limited and must be within a few inches of your vehicle in order to function If you are far from your vehicle and you press the key fob button, the car won't respond and will display the "Key Fob Not Detected" message in the instrument cluster If this occurs, replace the coin-cell battery Part Number CR2032 by a brand new one of a reputable brand like Panasonic Duracell or Energizer They can be found in your local hardware store or online You can test the battery in the coin-cell by pressing the buttons while standing close to your Fiat 500 The car will blink its parking lights, and the key fob should be able to operate the lock and unlock buttons 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 vehicle Water damage can occur in a number of ways, from small splashes to submerging the fob into salt water at the beach If you suspect your fob has been exposed to water, put it in a dry rice bag to pull the moisture out If that doesn't work your fob will probably require reprogramming by an experienced locksmith or dealer Water Damage Water damage can occur when you immerse the fob in the ocean or wash it in a washing machine https//wwwthekeylabcouk/fiat-car-keys/ is especially dangerous to the circuit board of the fob, causing it to short out and eventually die The fob getting wet is not a good idea, but if you drop it in an empty cup of water, or fail to take it out of your pants pocket prior to running the washer do not give up hope First remove the battery from the fob Clean the electronic chip with isopropyl or a similar product and dry it completely before replacing the battery Then try the fob and see if it works If the fob doesn't work 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 for your car, you will need to replace it completely A professional locksmith for cars can complete this simple process The locksmith must cut the key to match the ignition in your vehicle They will also need to reprogram the fob for the car's system This is a low-cost and fast process that can be completed in the same day Receiver Module Issues One of the simplest reasons your 500 key fob won't be working is because it's out of range The remote has a range of 30 feet, which means in the event that you are far away from your vehicle it won't respond to your commands This can be easily fixed by moving closer to your vehicle until it starts responding If you've replaced the coin battery commonly known as a "button" or "watch" and the fob isn't working It could be because of an internal circuit board problem In most cases, reprogramming the fob can resolve the problem You can find the instructions for most vehicles on YouTube or in the owner's guide It's possible that you need to replace the metal clips that keep the coin battery in place If they lose tension it can prevent the coin battery from being seated properly, and this will cause the remote to malfunction In rare cases the fob could be out of the vehicle's sync because of hardware or software problems You can fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob In certain instances the software might need to be reinstalled in your body control modules Interference Interference can also cause the key fob not to receive or transmit a signal This can happen when the key fob is near a radio transmitter cell phones and radar detectors or another source of electromagnetic radiation The key fob may not work due to a bad connection with the buttons, water damage or damage to the internal chips If the key fob been unable to function for a while without notice and you've tried everything you can at home to resolve it eg You might have a damaged 500 receiver module if you've tried replacing the battery, reprogramming, or using an alternative key fob The receiver module, which is located under the dashboard, is able to pick up radio frequency signals from your key fob It transforms the signals into electronic commands, which are then translated by the vehicle Fortunately, there's an easy method to reset all of the on-board systems in your 500 device, including the key fob Disconnect the battery 12 volt for about 15 minutes by disconnecting the negative cable first then the positive cable Reconnect the battery This will remove any residual electricity and restart the car's computers This could allow you to the key fob to function again If the issue persists, you should consult an experienced technician They'll be able identify the root cause of your problems