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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a handy way to open the doors and start the car. However, there are a variety of reasons the fob could stop working. This includes a dead battery or water damage, problems with receiver modules, as well as interference. This listing is for a NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It has to be professionally programmed (click here to search for local locksmiths in the automotive industry). This remote includes trunk, lock and unlock buttons. Dead Coin Battery The most common reason your 500 key fob won't work is a dead battery. Modern key fobs come with a restricted operating range, and should be within just a few feet of the car to operate. 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 battery in the coin cell (Part number CR2032) by a new one from a reputable brand like Panasonic, Duracell, or Energizer. You can find them in your local hardware store or online. You can test the coin-cell battery by pressing the buttons while standing close to your Fiat 500. The car should flash its parking lights, and the key fob will operate the lock and unlock buttons. If the fob's key doesn't work after replacing the battery, it may be damaged by water that blocks it from communicating with the receiver module in your car. Water damage can happen in a variety of ways, from the slightest splash to submerging the fob in salt water at the beach. If fiat key think your fob was exposed to water, you can place it in a bag of rice to draw out the moisture. If this fails, you'll require your fob to be reprogrammed either by an auto locksmith or a dealer. Water Damage Water damage can occur if you immerse the fob into the ocean, or wash it in a washing machine. Saltwater can cause the circuit board to short, and eventually die. Getting the fob wet is not an option, but if you drop it in a cup of water or do not remember to remove it from your pocket before you run the washer, don't give up hope. Remove the battery first. Before replacing the battery, clean the electronic chip with isopropyl or another similar product. Check the fob again to verify if it's functioning. If the fob doesn't work then it might need to be reprogrammed. This is typically handled by a professional or dealer auto locksmith. If the key is older and was not programmed to your vehicle It will most likely need to be replaced completely. This is an easy process which can be accomplished by a professional locksmith for automotive use. The locksmith will require the key to be cut to match the car's ignition. The locksmith will also have to program your fob into the vehicle's system. This is an affordable and quick process that can be completed within the same day. Receiver Module Issues One of the most common reasons your 500 key fob won't be functioning is because it's out of range. The remote usually has an area of 30 feet or less, and if it's too far away from your car it won't respond to your commands. It is possible to solve this issue 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 issue. In most cases, reprogramming the fob will fix the issue. You can find the instructions for the majority of vehicles on YouTube or in the owner's guide. It is possible to replace the metal clips that keep the coin battery in place. If they loose tension they could stop the battery from sitting properly and could cause your remote to malfunction. In rare cases the fob could be desync'd with your vehicle because of software or hardware issues. This could cause a significant issue, but you are able to usually fix it by visiting a local dealer or auto locksmith to have them reprogram your fob for you. In certain instances the software may need to be reinstalled in your body control modules. Interference In addition to a dead coin battery the key fob could not be able to receive or transmit signals due to interference. This is possible when the key fob is close to the radio transmitter (cell phones and radar detectors) or another source of electromagnetic radiation. Other reasons the key fob might not function include a weak connection to the buttons or damage to the internal chip or water damage. If your key fob suddenly stopped working, or you've tried everything at home to fix it (e.g. replacing the battery, reprogramming, and using the spare key fob, you could have a defective 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 read by the vehicle. Luckily, there is an easy method of resetting all of the on-board systems in your 500, including the key fob. Disconnect the battery for 15 minutes by taking off first the negative cable, then the positive cable. Then reconnect the battery. This will eliminate any remaining electrical charge, and then restart the computer of your car. This can help get your key fob working again. If the issue continues, you should seek out an expert technician. They will be able to identify the root cause of any issues.