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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to unlock the doors and get started the car. There are a variety of reasons why the fob won't work. These include a dead coin battery or damaged receiver module, water damage issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It has to be professionally programmed (click here to find local locksmiths for automotive locksmiths). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob not working. Modern key fobs come with a limited operating range and should be within some feet of the vehicle in order to function. If you are 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, replace the coin cell battery (Part number CR2032) with a fresh one from a trusted brand like Panasonic, Duracell, or Energizer. They are usually available in your local hardware store, or online. You can test the battery on your coin-cell by pressing the buttons while standing near your Fiat 500. The parking lights will flash and the key fob will operate the lock and unlock switches. If your key fob still does not work after replacing the battery, it may be water damage that hinders it from connecting to the module inside your vehicle. Water damage can happen in a variety of ways, ranging from the slightest splash to submerging the fob salt water at the beach. If you suspect your fob was exposed to water, you can try placing it in a dry rice bag to pull the moisture out. If this doesn't work your fob will probably need to be reprogrammed by a professional auto locksmith or the dealer. Water Damage Damage to the water supply can occur if you immerse the fob into the ocean or wash it in a machine. Saltwater can cause the circuit board to become shorted and eventually die. The fob getting wet is not an option but if you accidentally drop it into an empty cup of water, or forget to take it out of your pants pocket prior to running the washing machine, don't give up hope. First remove the battery from the fob. Before replacing the battery, clean the electronic chip using isopropyl, or a similar product. Test the fob afterward to verify if it's functioning. If the key doesn't function, it may have to be changed. This is usually handled by an auto locksmith or dealer. If replacement key for fiat 500 is older and not programmed for your car then you'll need to replace it completely. A professional locksmith for automotive can complete this simple process. The locksmith must cut the key to match the ignition in your vehicle. They'll also need to reprogram the fob to 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 main reasons why your 500 key fob may stop working is because it's out of range. The remote's range is of 30 feet. So should you be too far away from your vehicle it will not respond to your commands. It's easy to solve this issue by moving the remote closer to your car until it responds. If your fob doesn't work after replacing the coin battery, also known as a “button”, “watch” or “button” It could be due to a problem with the internal circuit board. Reprogramming the fob usually resolves this issue. You can find the instructions for most vehicles on YouTube or in the owner's guide. It is possible to replace the clips made of metal that hold the coin batteries in their place. If they lose tension it can prevent your coin battery from being properly seated and cause your remote to malfunction. In rare cases the fob might be out of sync with your vehicle because of hardware or software problems. This can cause a major trouble, but you could often fix this by visiting a local dealer or auto locksmith to reprogram your fob for you. In some instances, the software may also require reinstallation to your body control modules. Interference Interference can also cause the key fob to not be able to receive or transmit the signal. This could happen when the keyfob's location is in close proximity to a radio transmitter such as a cell phone or radar detector. Other reasons the key fob may not function could be due to a weak connection to the buttons or the internal chip, or water damage. If the key fob suddenly stopped working, suddenly and you've tried everything you can at home to resolve it e.g. You may have a faulty 500 receiver module if you've tried replacing the battery, reprogramming or using a spare key fob. The receiver module is situated under the dash, and it picks up the radio frequency signals from the key fob. It converts them to electronic commands that the vehicle interprets. Luckily, there is an easy method to reset all of the on-board systems in your 500 keys, including the key fob. Disconnect the battery for 15 minutes by taking off first the negative cable and then the positive cable. Then reconnect the battery. This will get rid of any remaining electrical charge and restart the car's computers. This could allow you to get your key fob working again. If the problem persists you should seek the advice of an expert technician. They will be able to determine the exact cause of any issues.