Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a convenient method to unlock the doors and start the car. However, there are numerous reasons the fob could stop working. This could be due to a dead battery and water damage, as well as problems with receiver modules, as well as interference. This listing is for an NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It needs to be professionally programmed (click here to find local locksmiths in the automotive industry). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most frequent cause of your 500 key fob that isn't working. Key fobs of today have an operating range that is limited and must be within just a few inches of the vehicle in order to function. If you are not within your vehicle and push the keyfob button it will not respond and display the message "Key Fob Not Detected". If this happens, simply replace the battery on your coin cell (Part number CR2032) with a fresh one from a reliable brand like Panasonic, Duracell, or Energizer. They can be found in your local hardware store or on the internet. You can test the coin-cell battery by pressing the buttons while standing near your Fiat 500. The car should blink its parking lights and the key fob will operate the lock and unlock buttons. 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 many ways, such as simply splashing or submerging your key fob in saltwater at the beach. If you believe your fob was exposed to water, place it in a bag of rice to draw out the moisture. If this doesn't work, you will need to have the fob changed by an auto locksmith or a dealer. Water Damage Water damage can occur if you immerse the fob in the ocean or wash it in a washing machine. Saltwater can cause the circuit board to short and then die. In the event that you let your fob get wet, it's not a good idea but if you drop it into an empty cup of water, or don't remember to take it out of your pocket before you run the washing machine do not give up hope. Take the battery off first. Before replacing the battery clean the electronic chip using isopropyl or similar products. Next try the fob and verify if it is working. If the key doesn't work, it may have to be reprogrammed. This is typically handled by a professional or dealer auto locksmith. If your key is old and has not been programmed for your car then you'll need to replace it completely. A professional locksmith for cars can complete this simple process. The locksmith needs to cut the key to match the ignition of your car. They'll also need to reprogram the fob in your vehicle's system. This is an affordable and fast process that can be completed in the same day. Receiver Module Issues One of the most common reasons why your 500 key fob won't be working is that it's simply out of range. The remote typically has an operating range of 30 feet or less, and if it's too far away from your car it will not respond to your commands. You can easily solve this problem by moving the remote closer to your car until it responds. If your fob doesn't work after you replace the coin battery, also known as a "button", "watch" or "button", it could be due to a problem with the circuit board inside. In most cases, reprogramming the fob will fix the issue. You can find the procedure for the majority of vehicles on YouTube or in the owner's guide. You may need to replace the metal retaining clips that keep the coin battery. If https://www.thekeylab.co.uk/fiat-car-keys/ could prevent the coin battery from sitting properly and can cause the remote to malfunction. In rare cases the fob may be out of sync with your vehicle because of hardware or software problems. This can be a major issue, but you are able to usually resolve this issue by visiting an auto locksmith to reprogram your fob for you. In some cases the software may require reinstallation to your body control modules. Interference In addition to a dead coin battery the key fob could not be receiving or transmitting the signal due to interference. This can occur when the keyfob's location is in close proximity to a radio transmitter like a cell phone or radar detector. The key fob could not function due to a poor connection to the buttons, water damage or damage to the internal chips. If your key fob suddenly stopped working, or you've tried everything at home to fix it (e.g. replacing the battery, reprogramming, and using the spare key fob, you might have a damaged receiver module on your 500. The receiver module is situated under the dash and receives the radio frequency signals from the key fob. It transforms the signals into electronic commands that are then interpreted by the vehicle. There is a simple way to reset the 500's onboard system including the keyfob. Disconnect the 12 volt battery for approximately 15 minutes by removing the negative cable first then the positive cable. Reconnect the battery. This will clear any residual electric current, and also restart the computer of your car. This can help you get your key fob working again. If the problem persists you should seek out an expert technician. They'll be able to diagnose the exact cause of your issue.