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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a handy way to unlock the doors and start the car. There are a myriad of reasons the key fob might stop working. This includes a dead coin-battery or water damage, receiver modules issues, and interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be programmed professionally by a local locksmith (click here to search for a Locksmith Search). Includes trunk, lock and unlock buttons. Dead Coin Battery A dead battery is the most frequent cause of your 500 key fob not working. Modern key fobs only have only a limited range of operation and must be within only a few inches from the vehicle to work. If you are far from your vehicle, and you press the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this happens, replace the battery in the coin cell (Part number CR2032) with a new one from a reputable manufacturer like Panasonic, Duracell, or Energizer. You can find them at your local hardware store or on the internet. You can test the battery on your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The parking lights should blink and the key fob will operate the lock and unlock switch. If your key fob isn't working after replacing the battery, there may be water damage which has prevented it from interacting with the module inside your vehicle. Water damage can happen in a number of ways, from small splashes to submerging your fob in salt water at the beach. If you suspect that your fob has been exposed to water, try placing it in a dry rice bag to draw the moisture back out. If this does not work, you'll need to have your fob reset by an auto locksmith or a dealer. Water Damage Water damage can occur if you submerge the fob in the ocean or wash it in a washer. Saltwater can cause the circuit board to short and eventually end up dying. It's not a good thing to let the fob get wet however, but don't give it up even if you accidentally drop the fob in water, or fail to take it out of your pocket. Take the battery off first. Before replacing The Keylab clean the electronic chip with isopropyl or similar products. Then try the fob and check if it functions. If the key isn't working it could need to be programmed again. This is typically done by a professional or dealer auto locksmith. If the key is newer and hasn't been programmed to your vehicle, it will likely need to be replaced completely. A professional locksmith in the automotive industry will be able to complete this process. The locksmith must cut the key to match the ignition of your vehicle. The locksmith also needs to reprogram your fob into the vehicle's system. This is a cheap and quick procedure that can be completed in the same day. Receiver Module Issues One of the most common reasons why your 500 key fob won't be working is because it's out of range. The remote typically has a range of 30 feet or less, and if it's too far from your car, it won't respond to your commands. This can be easily fixed by moving it closer to your vehicle until it starts responding. If you've replaced your coin battery (commonly known as”button” or “button” or “watch”) and the fob isn't working It could be because of an internal circuit board issue. In the majority of cases, reprogramming your fob will resolve this issue. You can find the procedure for most vehicles on YouTube or in the owner's guide. You may need to replace the metal clips that keep the coin battery in place. If they lose tension, they could stop the coin battery from being seated properly and could result in the malfunction of your remote. In rare cases the fob may be out of alignment with your vehicle because of hardware or software issues. This can cause 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 instances they might need to install the software again in your body control module as well. Interference In addition to a dead coin battery The key fob may not be able to receive or transmit signals due to interference. This can happen when the key fob is close to radio transmitters (cell phones, radar detectors) or any other source of electromagnetic radiation. Other reasons the key fob might not function include a weak connection to the buttons and internal chip or water damage. If the key fob been unable to function for a while in the middle of the night, or after trying every option at home to solve it e.g. It could be a defective 500 receiver module after you've tried replacing the battery, reprogramming, and using an alternative key fob. 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 that are then processed by the vehicle. Fortunately, there's an easy method of resetting all on-board systems in your 500 and include the key fob. Disconnect the 12 volt battery for approximately 15 minutes by taking off the negative cable first then the positive cable. Reconnect the battery. This will erase any remaining electrical charge, and then restart the car's computer. This can help you get your key fob working again. If the problem persists you should seek the advice of an expert technician. They will be able diagnose the exact cause of any issues.