Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob makes it simple to open doors and start your vehicle. There are many reasons why the fob could stop working. This could be due to a dead coin battery or damage to the receiver module, issues, or interference. This listing is for a NEW replacement Fiat Flip Key Remote - look-alike Ilco brand that must be programmed professionally by a local locksmith (click here to search for a Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most common reason your 500 key fob will not function is the battery is dead. Modern key fobs have a limited operating range and must be within just a few feet of the vehicle in order to function. If you're far away from your vehicle when you press the key fob button the car will not respond, and will display an "Key Fob Not Detected" message in the instrument cluster. If this happens, replace the coin-cell battery (Part Number CR2032) by a new one of a reliable brand, like Panasonic Duracell or Energizer. They are typically available at 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 flash its parking lights and the key fob will operate the lock and unlock buttons. If your fob's key isn't working after replacing the battery, it might be water damage that is preventing it from interacting with the module in your vehicle. Water damage can happen in many ways, including an easy splash or submerging the key fob in saltwater at the beach. If you suspect that your fob has been exposed to water, you can place it in a rice bag to draw out the moisture. If this doesn't work, you will need to have your fob reset by an auto locksmith or dealer. Water Damage Water damage can occur when you immerse the fob into the ocean or wash it in a washing machine. Saltwater can be particularly harmful to the circuit board of the fob and can cause it to short out and eventually end up dying. It's not a good idea to get the fob wet but don't give up even if you accidentally drop the fob in water or fail to take it out of your pants pocket. Remove the battery first. Clean the electronic chip with isopropyl alcohol or another similar product and then dry it thoroughly before replacing the battery. Then, test the fob to verify if it is working. If the key doesn't work, it might need to be reset. This is typically done by a professional or dealer auto locksmith. If your key is old and not programmed for your vehicle then you'll need to replace it completely. A professional locksmith in the automotive industry will be able to complete this process. The locksmith will need the key cut to match your car's ignition. They'll also need to reprogram the fob to the system of your car. It's a simple and affordable process that can usually be completed within the next day. Receiver Module Issues One of the most common reasons why your 500 key fob won't be functioning is that it's out of range. The remote's range is of 30 feet, which means if you are too far away from your vehicle it will not respond to your commands. You can easily remedy this by moving your remote closer to your vehicle until it responds. If you've replaced the coin battery (commonly called a "button" or "watch") and the fob won't work it could be due to an internal circuit board issue. In the majority of cases, reprogramming your fob will solve the problem. You can find the instructions on how to do this for most vehicles by searching YouTube or looking through the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in their place. If they lose tension, they could stop the coin battery from being seated properly and could cause the remote to malfunction. In rare instances, the fob might be out of alignment with your vehicle because of hardware or software issues. This can cause a major headache, but you can usually resolve this issue by visiting an auto locksmith to have them reprogram your fob for you. In certain instances it may be necessary to reinstall the program in your body control module too. Interference Interference can also cause the key fob not to receive or transmit an signal. This could occur if the keyfob is located in close proximity to a radio transmitter, like a cellphone or radar detector. Other reasons the key fob could not function may be a lack of connection to the buttons or the internal chip or water damage. If the key fob has failed to work one day out of the blue, or after trying every option at home to resolve it e.g. It could be a defective 500 receiver module in the event that you've tried replacing the battery, reprogramming, or using a spare key fob. The receiver module, which is located beneath the dashboard, receives radio frequency signals from your key fob. It converts the signals into electronic commands that are then read by the vehicle. There is https://www.thekeylab.co.uk/fiat-car-keys/ to reset the 500's internal system including the keyfob. Disconnect the battery for 15 minutes, removing first the negative cable, then the positive cable. Then, reconnect the battery. This will clear out any residual electricity and restart the car's computers, which can help you get your key fob working again. If the problem persists you should seek out an expert technician. They will be able to determine the exact cause of issues.