Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a great way to unlock the doors and get started the car There are a variety of reasons why the fob won't work This could be due to a dead coin-battery or water damage, receiver modules 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 lock, unlock and trunk buttons Dead Coin Battery A dead battery is the main cause of your 500 key fob not functioning Key fobs of today have a limited range of operation and must be within only a few inches from the vehicle in order to function If you're far away from your vehicle and press the key fob button, the car won't be able to respond, and will display the "Key Fob Not Detected" message in the instrument cluster If this happens, simply replace the coin cell battery Part number CR2032 with a fresh one from a reputable manufacturer such as Panasonic, Duracell, or Energizer They can be found in the local hardware store or on the internet You can test the battery in the coin-cell by pressing the buttons while you are standing close to your Fiat 500 The car will blink its parking lights and the key fob should work the lock and unlock buttons If your key fob still isn't working after replacing the battery, it may be water damage which hinders it from communicating with the module in your vehicle Water damage can happen through a variety of methods, including simply splashing or submerging the key fob in saltwater at the beach If you suspect that your fob was exposed to water, place it in a bag of rice to draw out the moisture If that doesn't work, your fob is likely to need to be reset by an experienced locksmith or dealer Water Damage Although the fob is equipped with rubber seals that keep water from the chip's electronic circuit, submerging it in the ocean or washing it in a machine could cause water damage Saltwater can cause the circuit board to short, and eventually cease to function If you get the fob wet, it's not a good idea but if you drop it in an empty cup of water, or don't remember to remove it from your pants pocket before running the washing machine and you don't have a chance, don't give in First take the battery off the fob Before replacing the battery clean the electronic chip with isopropyl or a similar product Next test the fob to see if it works If the key does not function it could need to be programmed again This is usually handled by an auto locksmith or dealer If your key is old and has not been programmed for your vehicle, you will need to replace it completely A professional locksmith for automotive can carry out this simple task The locksmith will have to cut the key to match the ignition of your car The locksmith also needs to reprogram your fob into the car's system This is a simple and inexpensive process which can be completed in the same day Receiver Module Issues One of the main reasons why your 500 key fob might stop working is that it's simply out of range The remote's range is of 30 feet So when you're too far from your car, it won't respond to your commands You can fix this by moving the remote closer to your vehicle until it responds If you've replaced your coin battery commonly called"button" or "button" or "watch" and the fob isn't working it could be due to an internal circuit board issue In the majority of cases, reprogramming your fob will solve the issue You can find the steps for most vehicles on YouTube or in the owner's manual It could be necessary to replace the metal clips that hold the coin batteries in the correct position If they lose tension it can stop your coin battery from sitting properly and cause your remote to malfunction In rare cases, the fob may become desync'd with your vehicle due to software problems or hardware issues This issue can be fixed by visiting your local auto-locksmith or dealer to reprogram your key fob In some cases they may have to reinstall the software in your body control module too Interference In addition to a dead battery on a coin The key fob may not be receiving or transmitting an signal due to interference This is possible when the key fob is close to a radio transmitter cell phones, radar detectors or any other source of electromagnetic radiation The key fob could not function because of a weak connection to the buttons or water damage, or damage to the internal chips If your key fob suddenly stopped working, or you've tried everything at home to solve the issue eg You may have a faulty 500 receiver module in the event that you've tried replacing the battery, reprogramming, or using a spare key fob The receiver module is situated under the dash and picks up the radio frequency signals from the key fob It then converts them into electronic commands that the vehicle interprets There's a simple method to reset the 500's on-board system, including the keyfob Disconnect the battery for 15 minutes, removing first the negative cable, then the positive cable Reconnect the battery This will clear any residual electricity, and restart the computer in your car This can help get your key fob working again If the issue persists you should seek out an experienced technician https//wwwthekeylabcouk/fiat-car-keys/ will be able to determine the root of your problems