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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 makes it easy to open doors and start your vehicle. There are many reasons why the key fob might stop working. This includes a dead battery or water damage, receiver modules issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It must be professionally programmed (click here to search for local locksmiths for your vehicle). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the main reason for your 500 key fob that isn't working. Modern key fobs only have a limited range of operation and must be within just a few inches of the vehicle in order to work. If you're far away from your vehicle when you press the key fob button, the car won't respond, and will display an “Key Fob Not Detected” message in the instrument cluster. If this happens If this happens, replace the battery in the coin-cell (Part Number CR2032) by a brand new one of a trusted brand such as Panasonic Duracell or Energizer. You can find them at your local hardware store, or on the internet. After you've replaced the battery in the coin cell you can test it by standing near your Fiat 500 and pressing the buttons. The parking lights should flash and the key fob will operate the lock and unlock switch. If your key fob does not work after replacing the battery, it may be water damage which has prevented it from connecting to the module in your vehicle. Water damage can occur in many ways, including an easy splash or submerging your key fob in saltwater at the beach. If you suspect that your fob was exposed to water, put it in a bag of rice to draw out the moisture. If that doesn't work your fob will probably need to be reset by a professional locksmith or dealer. Water Damage While the fob comes with rubber seals that keep water from the chip's electronic circuit it, submerging it in the ocean or washing it in a machine can cause water damage. Saltwater is particularly dangerous to the circuit board of the fob, causing it to short out and eventually die. It's not a good thing to soak the fob in water however, but don't give it up when you accidentally drop it in water or fail to remove it from your pocket. Remove the battery first. Before replacing the battery, clean the electronic chip using isopropyl or a similar product. Then try the fob and see if it works. If the key isn't working, it may need to be programmed again. This is usually handled by a professional or dealer auto locksmith. If the key is a newer model and has never been programmed to your vehicle, it will likely need to be replaced completely. This is a simple process that can be carried out by a professional automotive locksmith. The locksmith will need the key cut to match the car's ignition. The locksmith also needs to reprogram the fob into the vehicle's system. This is an affordable and fast process that can be completed in the same day. Receiver Module Issues One of the main reasons why your 500 key fob may stop functioning is because it's out of range. The remote usually has an area of 30 feet or less and if it's far from your car, it won't respond to your commands. You can fix this by moving the remote closer to your car until it responds. If you've replaced your coin battery (commonly known as a “button” or “watch”) and your fob still won't work It could be because of an internal circuit board problem. In most cases, reprogramming the fob will resolve this issue. You can find directions on how to do this for the majority of automobiles by searching YouTube or reading the owner's manual. You may need to replace the metal retaining clips that keep the coin battery in place. If they loose tension, it can prevent the coin battery from being seated properly and can cause the remote to malfunction. In rare instances, the fob might be out of the vehicle's sync because due to hardware or software issues. This could cause a significant problem, but you can frequently fix this issue by visiting a local dealer or auto locksmith to reprogram your fob for you. In certain situations they may have to install the software again in your body control module, too. fiat replacement key can also cause the key fob to not receive or transmit signals. This may happen if the keyfob is in close proximity to a radio transmitter like a cell phone or radar detector. Other reasons why the key fob could not function could be due to a weak connection to the buttons or damage to the internal chip or water damage. If the key fob has suddenly stopped working, out of the blue or after trying every option at home to resolve it e.g. battery replacement, reprogramming and using the spare key fob, you might have a malfunctioning receiver module on your 500. The receiver module is located under the dash, and it picks up the radio frequency signals from the key fob. It converts the signals into electronic commands which are then translated by the vehicle. Fortunately, there's an easy way to reset all on-board systems in your 500 keys, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Then, reconnect the battery. This will erase 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 issue persists it is recommended that you consult an experienced technician. They will be able to identify the root cause of any problems.