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Reasons Your Fiat 500 Key Fob Won't Work A key fob for Fiat 500 makes it easy to open doors and start your car. There are a myriad of reasons the fob may stop working. This could be due to a dead battery, water damage, problems with receiver modules, as well as interference. This listing is for an NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to search for local locksmiths for automotive locksmiths). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the main reason for your 500 key fob being inoperative. Modern key fobs come with a limited operating range and must be within a few feet of the vehicle to function. If you're far from your car and hit the keyfob, it will not respond, and display the message “Key Fob Not Detected”. If this happens, replace the coin-cell battery (Part Number CR2032) by a brand new one from a reputable brand such as Panasonic Duracell or Energizer. They are usually available at your local hardware store, or online. You can test the battery in the coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switches. If your key fob still isn't working after replacing the battery, it could be water damage that is preventing it from connecting to the module inside your vehicle. Water damage can happen in a number of ways, from the slightest splash to submerging the fob into salt water at the beach. If you suspect that your fob was exposed to water, you can try placing it in a dry rice bag to draw the moisture back out. If that doesn't work, your fob is likely to require reprogramming by a professional auto locksmith or dealer. Water Damage Water damage can happen if you immerse the fob into the ocean or wash it in a machine. Saltwater can be particularly harmful to the fob's circuit board and can cause it to short out and eventually end up dying. If fiat 500 key replacement get the fob wet, it's not an ideal choice however, if you drop it into the water in a cup or don't remember to remove it from your pants pocket before running the washer do not give up hope. First, remove the battery from the fob. Before replacing the battery, clean the electronic chip using isopropyl or similar products. Check the fob again to check if it's working. If the key doesn't function then it might need to be reprogrammed. This is typically handled by a professional or dealer auto locksmith. If your key is a bit older and has not been programmed for your car You will need to replace it completely. A professional locksmith in the automotive industry can complete this simple process. The locksmith will require the key cut to match the car's ignition. They'll also need to reprogram the fob in your car's system. This is a cost-effective and quick process that could be completed in the same day. Receiver Module Issues Your 500 key fob may not work because it's out of range. The remote usually has an operating range of 30 feet or less, and if it's too far from your car, it will not respond to your commands. This can easily be resolved by moving it closer to your vehicle until it begins responding. If your fob doesn't work after you replace the battery for the coin, also known as a “button”, “watch” or “button” or “button”, it could be due to an issue with the internal circuit board. In most cases, reprogramming the fob will fix the issue. You can find instructions on how to do this for all automobiles by searching YouTube or reading the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in place. If they loose tension they could stop the coin battery from being properly seated and cause your remote to malfunction. In rare instances, the fob may be out of sync with your vehicle because of software or hardware problems. This can cause a major problem, but you can usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob for you. In certain situations they might need to reinstall the software on your body control module, as well. Interference In addition to a dead coin battery the key fob could not be able to transmit or receive the signal due to interference. This is possible when the key fob is in proximity to a radio transmitter (cell phones, radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob might not work include a poor connection to the buttons or the internal chip or water damage. If the key fob has stopped working one day in the middle of the night and you've tried every option at home to fix it e.g. battery replacement, reprogramming and using the spare key fob, you may have a faulty receiver module on your 500. The receiver module is located under the dash and is able to pick up the radio frequency signals from the key fob. It converts the signals into electronic commands, which are then interpreted by the vehicle. Fortunately, there's an easy method of resetting every single system on board in your 500 keys, including the key fob. 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. This could help you get your key fob working again. If the problem persists you should seek out an expert technician. They will be able diagnose the root cause of any issues.