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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a great way to open the doors and begin the car. There are many reasons the fob could stop working. This could be due to a dead coin battery or damage to the receiver module, issues, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It needs 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 A dead battery is the most common reason for your 500 key fob that isn't working. Modern key fobs offer only a limited range of operation and must be within only a few inches from the vehicle in order to function. If you're far away from your vehicle and 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, replace the battery on your coin cell (Part number CR2032) with a new one from a reputable brand such as Panasonic, Duracell, or Energizer. They are available at your local hardware store, or online. After you've changed the battery on the coin cell, you can test it by standing near your Fiat 500 and pressing the buttons. The car should flash its parking lights and the key fob will operate the lock and unlock switches. If the fob's key doesn't function after replacing the battery, it may have water damage that prevents it from connecting to the receiver module inside your vehicle. Water damage can occur in a number of ways, from small splashes to submerging your fob in salt water at the beach. If you suspect your fob was exposed to water, try putting it in a dry rice bag to draw the moisture back out. If this isn't working, you'll have to get your fob reprogrammed either by an auto locksmith or a dealer. Water Damage Water damage can occur when you submerge the fob in the ocean, or wash it in a washing machine. Saltwater can cause the circuit board to short and eventually end up dying. It's not a good idea to get the fob wet however, don't give it up when you accidentally drop it in water or fail to remove it from your pocket. Remove the battery first. Clean the electronic chip using isopropyl alcohol or a similar product and dry it thoroughly before replacing the battery. Then test the fob to check if it functions. If the key isn't working it could need to be reset. This is usually handled by an auto locksmith or dealer. If your key is old and is not programmed for your car, you will need to replace it completely. A professional locksmith for automotive will be able to complete this process. The locksmith will need the key cut to match the car's ignition. They'll also have to reprogram the fob for the system of your car. This is a fast and cost-effective process which can be completed in the same day. Receiver Module Issues One of the main reasons why your 500 key fob won't be functioning is that it's out of range. The remote usually has a range of 30 feet or less, and if it's too far away from your car it won't respond to your commands. You can easily solve this issue by moving the remote closer to your car until it responds. If you've replaced the battery on your coin (commonly known as a “button” or “watch”) and the fob won't work it could be due to an internal circuit board problem. Reprogramming your fob can resolve this problem. You can find directions on how to do this on the majority of vehicles by searching YouTube or reading the owner's manual. It may be necessary to replace the metal clips that hold the coin batteries in place. If they become loose, it can prevent your coin battery from being properly seated, causing your remote to malfunction. In rare instances, the fob might be out of alignment with your vehicle because of software or hardware problems. This can be a major problem, but you can usually resolve this issue by visiting a local dealer or auto locksmith to have them reprogram your fob. In certain situations it may be necessary to reinstall the software on your body control module as well. Interference In addition to a dead coin battery The key fob may not be able to transmit or receive the signal due to interference. This could happen when the keyfob is in close proximity to a radio transmitter like a cellphone or radar detector. The key fob might not work due to a poor connection with the buttons, water damage or damage to the internal chips. If your key fob suddenly stopped working, or if you have tried everything at home to solve the issue (e.g. battery replacement, reprogramming and using the spare key fob, you could have a defective receiver module on your 500. locked keys in car boot fiat punto , located under the dashboard, is able to pick up radio frequency signals from your key fob. It converts the signals into electronic commands which are then interpreted by the vehicle. Fortunately, there's an easy way to reset every single system on board in your 500, including the key fob. Disconnect the battery of 12 volts for approximately 15 minutes by taking off the negative cable first then the positive cable. Then, reconnect the battery. This will remove any remaining electrical charge, and then restart the computer in your car. This could help you get your key fob working again. If the issue continues, you should seek the advice of an expert technician. They'll be able diagnose the exact cause of your problem.