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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 get started the car. There are many reasons why the fob won't work. This could be due to a dead coin battery or damage to the receiver module, issues, and interfering. This listing is for a NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to find local locksmiths for automotive locksmiths). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the main cause of your 500 key fob not working. Modern key fobs have an operating range that is limited and must be within just a few inches of the vehicle in order to function. If you are further away from your vehicle and you press the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this happens, simply replace the battery in the coin cell (Part number CR2032) with a brand new one from a reputable manufacturer like Panasonic, Duracell, or Energizer. They can be found in the local hardware store or on the internet. After you've changed the battery on the coin cell You can test it by standing in front of your Fiat 500 and pressing the buttons. The car will blink its parking lights, and the key fob should work the lock and unlock switches. If your fob's key isn't working after replacing the battery, it may be water damage that hinders it from communicating with the module inside your vehicle. Water damage can happen through a variety of methods, including an easy splash or submerging the key fob into saltwater at the beach. If you suspect your fob has been exposed to water, put it in a dry rice bag to draw the moisture out. If this isn't working, you'll need to have the fob reprogrammed either by an auto locksmith or dealer. Water Damage Water damage can happen if you immerse the fob in the ocean or wash it in a washer. Saltwater can be particularly harmful to the fob's circuit board which causes it to short out and eventually end up dying. The fob getting wet is not an option but if you accidentally drop it in an empty cup of water, or fail to take it out of your pants pocket before running the washer do not give up hope. First take the battery off the fob. Clean the electronic chip with isopropyl alcohol or a similar product and dry it thoroughly before replacing the battery. Test the fob next to verify if it's working. If the key isn't working, it may have to be reprogrammed. This is usually done by a professional or dealer auto locksmith. If G28 have is older and not programmed to work with your vehicle it is necessary to replace it completely. A professional locksmith for cars will be able to complete this process. The locksmith will need the key to be cut to match your vehicle's ignition. They will also need to reprogram the fob in your vehicle's system. This is a cost-effective and quick process that can be completed the same day. Receiver Module Issues The 500 key fob could be inoperable because it's out of range. The remote's range is of 30 feet. Therefore, in the event that you are far from your car, it won't respond to your commands. It's easy to solve this issue by moving the remote closer to your car until it responds. If your fob isn't working after you replace the battery in the coin, also called a “button”, “watch” or “button” It may be due to a malfunction on the internal circuit board. Reprogramming the fob usually resolves this problem. You can find the steps for the majority of vehicles on YouTube or in the owner's manual. You may need to replace the metal clips that keep the coin battery. If they lose tension, it can prevent your coin battery from sitting properly and cause your remote to malfunction. In rare cases the fob may be out of the vehicle's sync because due to hardware or software issues. This can be a major problem, but you can usually fix it by visiting an auto locksmith to have them reprogram your fob for you. In some cases the software may require reinstallation into your body control modules. Interference Interference can also cause the key fob not to receive or transmit signals. This could occur if the key fob is near radio transmitters (cell phones, radar detectors) or another source of electromagnetic radiation. The key fob may not work because of a problem with the buttons water damage or damage to the internal chips. If the key fob suddenly stopped working, in the middle of the night or after trying every option at home to solve it e.g. You might have a damaged 500 receiver module if you've tried replacing the battery, reprogramming or using an alternative key fob. The receiver module, located under the dashboard, detects radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. There is a simple way to reset the 500's in-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. Reconnect the battery. This will eliminate any remaining electricity and restart the car's computers, which can help get your key fob working again. If the problem persists, you should consult a certified technician. They will be able to determine the exact cause of issues.