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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 makes it easy to open doors and start your car. There are a myriad of reasons the fob won't work. This includes a dead coin-battery water damage, problems with receiver modules, as well as interference. This listing is for a NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to search for local locksmiths in the automotive industry). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob not functioning. fiat punto replacement key have an operating range that is limited and must be within a few inches of your vehicle in order to work. If you're far from your vehicle and you press 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) by a new one from a trusted brand like Panasonic, Duracell, or Energizer. They are typically available at your local hardware store or on the internet. You can test the battery of your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should flash and the key fob will operate the lock and unlock switch. If your key fob doesn't work even after replacing the battery, it may be water damage which is preventing it from connecting to the module in your vehicle. Water damage can happen in a variety of ways, from a light splash to submerging the fob into salt water at the beach. If you think 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 poses a particular risk to the circuit board of the fob, causing it to short out and eventually die. In the event that you let your fob get wet, it's not an option but if you drop it into an empty cup of water, or forget to remove it from your pocket before you run the washer 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 another similar product. Then check the fob to check if it functions. If the fob doesn't work it could need to be reprogrammed. This is usually handled by an auto locksmith or dealer. If your key is older and is not programmed to work with your vehicle, you will need to replace it completely. A professional locksmith in the automotive industry can do this job. The locksmith will need the key cut to match the car's ignition. The locksmith will also have to reprogram the fob into the vehicle's system. This is a cost-effective and quick procedure that can be completed the same day. Receiver Module Issues One of the simplest reasons your 500 key fob could stop working is that it's simply out of range. The remote usually has an operating range of 30 feet or less and if it's far from your car, it won't respond to your commands. This can easily be resolved by moving it closer to your vehicle until it starts responding. If you've replaced your coin battery (commonly called”button” or “button” or “watch”) and the fob isn't working It could be because of an internal circuit board problem. Reprogramming the fob typically resolves this problem. You can find instructions on how to do this on the majority of automobiles by searching YouTube or consulting the owner's manual. It's possible that you need to replace the metal retaining clips that keep the battery of your coin in place. If they loose tension, it may prevent your battery from sitting properly and cause your remote to malfunction. In rare cases the fob could be out of the vehicle's sync because due to hardware or software issues. This could cause a significant headache, but you can often fix this by visiting a local dealer or auto locksmith to have them reprogram your fob for you. In some instances they may have to reinstall the software on your body control module too. Interference In addition to a dead coin battery The key fob might not be able to receive or transmit a signal due to interference. This can happen when the key fob is in proximity to radio transmitters (cell phones, radar detectors) or another source of electromagnetic radiation. Other reasons the key fob may not function include a poor connection to the buttons, damage to the internal chip, or water damage. If your key fob suddenly stopped working, or if you have tried everything at home to solve the issue (e.g. You might have a damaged 500 receiver module in the event that you've tried replacing the battery, reprogramming, or using an alternative key fob. The receiver module, which is located beneath the dashboard, is able to pick up radio frequency signals from your key fob. It converts the signals into electronic commands, which are then interpreted by the vehicle. Luckily, there is an easy way to reset all on-board systems in your 500 device, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable, then the positive cable. Reconnect the battery. This will remove any remaining electricity, and allow you to restart the computer in your car. This could help you get your key fob to function again. If the problem persists you should speak with an expert technician. They'll be able to determine the exact cause of your issues.