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Reasons Your Fiat 500 Key Fob Won't Work A Fiat 500 key fob allows you to easily open doors and start your vehicle. There are a variety of reasons why the fob won't work. This could be due to a dead battery and water damage, as well as problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote – like the Ilco brand that needs to be programmed professionally by a local automotive locksmith (click here to search for a Locksmith Search). This remote includes trunk, lock and unlock buttons. Dead Coin Battery The most frequent reason that your 500 key fob will not function is an inactive battery. Modern key fobs operate with a limited operating range, and should be within only a few feet from the vehicle to operate. If you're far away from your vehicle, and you press the key fob button the car won't respond, and will display the “Key Fob Not Detected” message in the instrument cluster. If this happens, simply replace the battery on your coin cell (Part number CR2032) with a brand new one from a trusted brand such as Panasonic, Duracell, or Energizer. They are typically available at your local hardware store, or online. After you've replaced the coin cell battery You can test it by standing near your Fiat 500 and pressing the buttons. The parking lights should light up and the key fob should operate the lock and unlock switch. If the fob's remote doesn't work after replacing the battery, it might be damaged by water that blocks it from communicating with the receiver module in your vehicle. Water damage can happen in a number of ways, ranging from a light splash to submerging the fob salt water at the beach. If you suspect that your fob was exposed to water, try placing it in a dry rice bag to pull the moisture back out. If that doesn't work your fob will probably need to be reprogrammed by an experienced auto locksmith or by the dealer. Water Damage While the fob has some rubber seals that keep water out of the chip's electronic circuit, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater can be particularly harmful to the fob's circuit board that can cause it to short out and eventually die. In the event that you let your fob get wet, it's not a good idea, but if you drop it in the water in a cup or fail to remove it from your pocket before you run the washing machine, don't give up hope. Remove the battery first. Clean fiat doblo key fob replacement with isopropyl alcohol or another similar product and then dry it completely before replacing the battery. Check the fob again to verify if it's working. If the key doesn't function it could need to be changed. This is usually handled by an auto locksmith or dealer. If the key is older and hasn't been programmed to your car, it will likely need to be replaced completely. This is a simple procedure that can be completed by a professional automotive locksmith. The locksmith will need the key cut to match your vehicle's ignition. The locksmith will also have to reprogram your fob in the vehicle's system. It's a simple and inexpensive process that can be completed within the next day. Receiver Module Issues One of the most common reasons your 500 key fob might stop functioning is because it's out of range. The remote has a range of 30 feet. Therefore, should you be too far from your car it won't respond to your commands. It can be solved by moving it closer to your vehicle until it starts responding. If you've replaced the battery in your coin (commonly called a “button” or “watch”) and your fob still won't work it could be due to an internal circuit board issue. In the majority of cases, reprogramming your fob will fix the issue. You can find the instructions for most vehicles on YouTube or in the owner's manual. You may have to replace the metal clips that keep the coin battery. If they loose tension, it could prevent the coin battery from sitting properly and could result in the malfunction of your remote. In rare cases the fob may be out of sync with your vehicle because of hardware or software issues. This can be a major issue, but you are able to frequently fix this issue by visiting an auto locksmith to have them reprogram your fob for you. In some cases they may have to reinstall the software in your body control module, too. Interference In addition to a dead battery on a coin The key fob might not be receiving or transmitting signals due to interference. This could happen if the key fob is located near radio transmitters (cell phones, radar detectors) or another source of electromagnetic radiation. The key fob could not work because of a problem with the buttons, water damage or damage to the internal chips. If the key fob has suddenly stopped working, in the middle of the night and you've tried every option at home to fix it e.g. replacing batteries, reprogramming or using the spare key fob, it could have a malfunctioning receiver module on your 500. The receiver module is situated under the dash, and it picks up the radio frequency signals from the key fob. It converts them to electronic commands that the vehicle interprets. Luckily, there is an easy method to reset all on-board systems in your 500 device, 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. Reconnect the battery. This will remove any residual electricity and restart the car's computer system, which could allow you to the key fob to function again. If the problem persists you should consult an expert technician. They'll be able diagnose the exact cause of your problems.