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Reasons Your Fiat 500 Key Fob Won't WorkA Fiat 500 key fob allows you to easily open doors and start your vehicle. There are a variety of reasons why the fob won't work. These include a dead battery, damage to the receiver module, issues, and interference.This listing is for an NEW replacement Fiat Flip Key Remote - similar to the Ilco brand that must be professionally programmed by a local locksmith (click here for Locksmith Search). It comes with trunk, lock and unlock buttons.Dead Coin BatteryA dead battery is the most frequent cause of your 500 key fob being inoperative. Modern key fobs have only a limited range of operation and must be within just a few inches of the vehicle to work. If you're far from your vehicle and press the key fob button the car will not respond, and will display a "Key Fob Not Detected" message in the instrument cluster.If this happens, simply replace the battery of your coin cell (Part number CR2032) with a new one from a trusted brand such as Panasonic, Duracell, or Energizer. You can usually find them at your local hardware store or on the internet.You can test the battery on your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The car will flash its parking lights, and the key fob should operate the lock and unlock switches.If your key fob still doesn't work even after replacing the battery, it might be water damage that is preventing it from interacting with the module inside your vehicle. Water damage can occur in many ways, including an easy splash or submerging the key fob in saltwater at the beach. If you suspect that your fob was exposed to water, put it in a dry rice bag to draw the moisture back out. If this doesn't work, your fob will probably need to be reset by an experienced locksmith or dealer.Water DamageWater damage can occur if you immerse the fob into the ocean, or wash it in a machine. fiat 500 key replacement can cause the circuit board to short and eventually end up dying. The fob getting wet is not an ideal choice however, if you drop it in a cup of water or don't remember to remove it from your pants pocket prior to running the washer Don't give up hope.First, remove the battery from the fob. Before replacing the battery, clean the electronic chip with isopropyl or a similar product. Then check the fob to verify if it is working. If the fob doesn't function, it may need to be reprogrammed. This is usually handled by an auto locksmith or dealer.If the key is more recent and has never been programmed to your vehicle it is likely to need to be replaced completely. A professional locksmith for cars can complete this simple process. The locksmith will need to cut the key to match the ignition of your vehicle. The locksmith will also have to reprogram the fob into the vehicle's system. This is a fast and cost-effective procedure that can be completed the same day.Receiver Module IssuesOne of the main reasons why your 500 key fob might stop functioning is because it's out of range. The remote has a maximum range of 30 feet, which means when you're too far from your car it won't respond to your commands. You can easily solve this problem by moving the remote closer to your vehicle until it responds.If you've replaced the battery on your coin (commonly known as"button" or "button" or "watch") and the fob isn't working it could be due to an internal circuit board problem. In the majority of cases, reprogramming your fob can resolve the problem. There are instructions on how to do this on the majority of vehicles by searching YouTube or reading the owner's manual.It is possible to replace the metal retaining clips that hold the coin battery. If they lose tension it can prevent your coin battery from sitting properly, causing your remote to malfunction.In rare cases the fob might be out of alignment with your vehicle because of software or hardware problems. This can cause a major issue, but you are able to usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob. In some cases, the software may also require reinstallation to your body control modules.InterferenceIn addition to a dead coin battery the key fob could not be receiving or transmitting signals due to interference. This could happen if the key fob is located near the radio transmitter (cell phones, radar detectors) or any other source of electromagnetic radiation. The key fob could not function due to a bad connection with the buttons or water damage, or damage to the internal chips.If your key fob suddenly stopped working, or if you've tried everything at home to fix it (e.g. You may have a faulty 500 receiver module If you've tried replacing it with a battery, reprogramming, or using a spare key fob. The receiver module is located under the dash and is able to pick up the radio frequency signals from the key fob. It converts the signals into electronic commands, which are then read by the vehicle.There is a straightforward method to reset the 500's onboard system including the keyfob. Disconnect the battery of 12 volts for approximately 15 minutes by disconnecting the negative cable first then the positive cable. Then reconnect the battery. This will get rid of any residual electricity and restart the car's computer system, which can help you the key fob to function again. If the issue persists, you should speak with an expert technician. They'll be able to identify the root cause of your issues.