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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 car. However, there are many reasons why the fob won't be functioning. These include a dead coin battery water damage, receiver module problems, and 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 find local locksmiths for automotive locksmiths). spare key for fiat 500 www.thekeylab.co.uk includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the most frequent reason for your 500 key fob being inoperative. Modern key fobs have a limited range of operation, and should be within just a few feet of the vehicle to function. If you are not within your vehicle and you hit the keyfob, it won't respond and display the message “Key Fob Not Detected”. If this happens you need to replace the battery of your coin-cell (Part Number CR2032) with a new battery from a reputable brand such as Panasonic Duracell or Energizer. They are typically available at your local hardware store, or online. You can test the battery in the coin-cell by pressing the buttons while standing close to your Fiat 500. The car should flash its parking lights and the key fob should be able to operate the lock and unlock buttons. If the key fob doesn't work after replacing the battery, it may have water damage that prevents it from connecting to the receiver module in your car. Water damage can happen in many ways, including an easy splash or submerging your key fob in saltwater at the beach. If you believe your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this fails, you'll need to have the fob replaced by an auto locksmith or a dealer. Water Damage Although the fob is equipped with rubber seals to keep water out of the electronic chip inside and out of the ocean or washing it in a machine can cause water damage. Saltwater poses a particular risk to the circuit board of the fob which causes 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 in the event that you accidentally drop it in water, or fail to remove it from your pants pocket. Take the battery off first. Clean the electronic chip with isopropyl ethanol or a similar product and then dry it completely before replacing the battery. Next, test the fob to check if it functions. If the key doesn't function then it might need to be reset. This is typically handled by a dealer or professional auto locksmith. If your key is a bit older and not programmed for your car, you will need to replace it completely. This is a simple process that can be carried out by a professional automotive locksmith. The locksmith will need the key to be cut to match the car's ignition. The locksmith will also have to program your fob into the car's system. This is an affordable and quick process that can be completed within 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 has a maximum range of 30 feet. Therefore, if you are too far away from your vehicle, it won't respond to your commands. This can be fixed by moving closer to your vehicle until it starts responding. If your fob isn't working after you replace the battery in the coin, also called a “button”, “watch” or “button”, it could be due to an issue with the internal circuit board. Reprogramming your fob can resolve the issue. You can find directions on how to do this on the majority of vehicles by searching YouTube or consulting the owner's manual. It is sometimes necessary to replace the metal clips that hold the coin batteries in the correct position. If they loose tension, it could hinder the battery from being seated properly and can result in the malfunction of your remote. In rare instances, the fob may become disconnected from your vehicle due to software issues or hardware issues. This can cause a major headache, but you can frequently fix this issue by visiting an auto locksmith to reprogram your fob. In certain situations they may have to reinstall the software in your body control module too. Interference Interference can also cause the key fob to not receive or transmit an signal. This could occur if the keyfob is in close proximity to a radio transmitter such as a cell phone or radar detector. Other reasons why the key fob could not function include a poor connection to the buttons or damage to the internal chip, or water damage. If your key fob suddenly stopped working, or if you've tried everything at home to fix it (e.g. You could have a malfunctioning 500 receiver module after you've tried replacing the battery, reprogramming, or using an alternative key fob. The receiver module is located under the dash and picks up the radio frequency signals from the key fob. Then, it converts them into electronic commands that the vehicle interprets. There is a simple way to reset the 500's in-board system including the keyfob. Disconnect the 12 volt battery for about 15 minutes, by removing the negative cable first then the positive cable. Reconnect the battery. This will remove any remaining electricity and restart the car's computers, which can help the key fob to function again. If the issue continues it is recommended that you consult an experienced technician. They can identify the exact cause of any problems.