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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 makes it easy to open doors and start your vehicle. There are a myriad of reasons the fob could stop working. This includes a dead battery and water damage, as well as problems with receiver modules, as well as interference. This listing is for a NEW replacement Fiat Flip Key Remote – like the Ilco brand that must be professionally programmed by a local locksmith (click here for Locksmith Search). Includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the most common cause of your 500 key fob that isn't working. Modern key fobs have a limited range of operation and must be within just a few inches of the vehicle in order to function. If you are further away from your vehicle and press the keyfob button, it will not respond, and display the message “Key Fob Not Detected”. If this happens, replace the battery in the coin cell (Part number CR2032) with a brand new one from a reliable brand such as Panasonic, Duracell, or Energizer. They are typically available at your local hardware store or online. After you've replaced the battery of your coin cell It is possible to test it by standing next to your Fiat 500 and pressing the buttons. The parking lights will flash and the key fob will operate the lock and unlock switch. If the fob's remote doesn't work after replacing the battery, it might have water damage that stops it from communicating with the receiver module in your car. Water damage can happen in many ways, such as simply splashing or submerging the key fob saltwater at the beach. If you suspect that your fob has been exposed to water, put it in a dry rice bag to draw the moisture back out. If that doesn't work, your fob may require reprogramming by a professional auto locksmith or dealer. Water Damage Water damage can occur if you submerge the fob in the ocean, or wash it in a washing machine. Saltwater can cause the circuit board to short and eventually cease to function. It's not good to soak the fob in water however, but don't give it up when you accidentally drop it in water or forget to take it out of your pants pocket. First remove the battery from the fob. Before replacing the battery clean the electronic chip with isopropyl or similar products. Check the fob to check if it's functioning. If the key still doesn't work, it may have to be reprogrammed. This is typically done by a dealer or professional auto locksmith. If your key is old and not programmed for your car it is necessary to replace it completely. This is a straightforward process that can be completed by a professional automotive locksmith. The locksmith will require the key cut to match your vehicle's ignition. The locksmith also needs to reprogram the fob into the car's system. This is a quick and cost-effective process that can be completed the same day. Receiver Module Issues Your 500 key fob may not work because it's out of range. The remote typically has an area of 30 feet or less, and if it's too far from your car, it will not respond to your commands. This can be fixed by moving it closer to your vehicle until it starts responding. If you've replaced the battery in your coin (commonly known as a “button” or “watch”) and the fob won't work, it could have an internal circuit board issue. In most cases, reprogramming the fob will solve the issue. You can find the instructions on how to do this for the majority of automobiles by searching YouTube or checking out the owner's manual. You may have to replace the metal clips that hold the battery of your coin in place. If they lose tension, it can prevent the coin battery from sitting properly, and this will result in the malfunction of your remote. In rare cases the fob could be disconnected from your vehicle due to software problems or hardware issues. This could cause a significant issue, but you are able to usually resolve this issue by visiting an auto locksmith to reprogram your fob for you. In some cases the software might require reinstallation to your body control modules. Interference In addition to a dead coin battery, the key fob may not be able to transmit or receive signals 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 the key fob might not work could be due to a weak connection to the buttons or damage to the internal chip, or water damage. If the key fob failed to work one day in the middle of the night and you've tried every option at home to solve it e.g. replacing the battery, reprogramming, and using the spare key fob, you might have a damaged receiver module on your 500. The receiver module, located beneath the dashboard, receives radio frequency signals from your key fob. Then, it converts them into electronic commands that the vehicle interprets. There's a simple method to reset the 500's on-board system, including the keyfob. Disconnect the battery of 12 volts for about 15 minutes, by taking off the negative cable first then the positive cable. Then reconnect fiat ducato key . This will eliminate any remaining electric current, and also restart the computer in your car. This will help you get your key fob to function again. If the issue persists, you should seek the advice of an expert technician. They can identify the root of any issues.