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Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a handy way to unlock the doors and start the car. There are a myriad of reasons the fob won't work. This includes a dead coin-battery water damage, problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It must 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 the most frequent reason for your 500 key fob that isn't working. Modern key fobs come with a limited operating range, and must be within just a few feet of the car to operate. 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, simply replace the battery in the coin cell (Part number CR2032) by a new one from a trusted brand like Panasonic, Duracell, or Energizer. They are usually available in your local hardware store, or online. After you've replaced the battery of your coin cell you can test it by standing in front of your Fiat 500 and pressing the buttons. The parking lights should light up and the key fob will operate the lock and unlock switches. If the fob's key doesn't work after replacing the battery, it could have water damage that prevents it from connecting to the receiver module inside your vehicle. Water damage can occur in a variety of ways, from the slightest splash to submerging your fob in salt water at the beach. If you suspect that your fob was exposed to water, place it in a bag of rice to draw out the moisture. If that doesn't work your fob may require reprogramming by a professional locksmith or dealer. Water Damage Water damage can happen if you submerge the fob in the ocean or wash it in a machine. Saltwater can cause the circuit board to short and eventually cease to function. The fob getting wet is not an option but if you drop it into the water in a cup or forget to remove it from your pants pocket before running the washing machine and you don't have a chance, don't give in. Remove the battery first. Clean the electronic chip using isopropyl alcohol or a similar product and dry it thoroughly before replacing the battery. Next check the fob to verify if it is working. If the key does not function, it may have to be reset. This is usually done by an auto locksmith or dealer. If the key is older and hasn't been programmed to your vehicle It is likely that it needs to be replaced completely. This is a simple process that can be completed by a professional automotive locksmith. The locksmith will need the key to be cut to match the car's ignition. They'll also have to program the fob into your vehicle's system. This is a quick and cost-effective procedure which can be completed on the same day. Receiver Module Issues Your 500 key fob may stop working because it is out of range. The remote usually has an area of 30 feet or less and if it's far from your vehicle, it will not respond to your commands. You can solve this problem by moving the remote closer to your vehicle until it responds. If you've replaced the battery on your coin (commonly called a “button” or “watch”) and the fob isn't working it could be due to an internal circuit board issue. Reprogramming the fob is usually the solution to this problem. The instructions are available for the majority of vehicles on YouTube or in the owner's guide. You may have to replace the metal retaining clips that keep the coin battery. If they loose tension, it can prevent your coin battery from sitting properly, causing your remote to malfunction. In rare cases, the fob may become disconnected from your vehicle due to software problems or hardware issues. This can be a major problem, but you can often fix this by visiting an auto locksmith to have them reprogram your fob. In some cases, they may need to reinstall the program in your body control module too. Interference Interference can also cause the key fob to not receive or transmit the signal. This could happen if the key fob is located near radio transmitters (cell phones, radar detectors) or another source of electromagnetic radiation. Other reasons why the key fob may not function may be a lack of 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. replacing batteries, reprogramming or using the spare key fob, you might have a faulty receiver module on your 500. The receiver module, located beneath the dashboard, is able to pick up radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets. There's a simple method to reset the 500's onboard system, including the keyfob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Reconnect the battery. This will eliminate any remaining electric current, and also restart the computer in your car. fiat punto key replacement could help you get your key fob to work again. If the issue continues you should seek out an expert certified technician. They'll be able to determine the exact cause of your problems.