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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to open the doors and begin the car. There are a variety of reasons why the fob could stop working. This could be due to a dead battery, water damage, receiver modules issues, and interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that needs to be programmed professionally by a local locksmith (click here to search for a Locksmith Search). Includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob not functioning. Modern key fobs operate with a limited range of operation, and must be within only a few feet from the vehicle to operate. If you are further away from your vehicle, and you push the keyfob button it will not respond, and display the message “Key Fob Not Detected”. If this happens, simply replace the battery of your coin cell (Part number CR2032) with a brand new one from a reliable brand like Panasonic, Duracell, or Energizer. You can usually find them at your local hardware store, or online. You can test the battery on your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should blink and the key fob should operate the lock and unlock switch. If your key fob isn't working after replacing the battery, it might be water damage that has prevented it from connecting to the module inside your vehicle. Water damage can happen through a variety of methods, including the simple splash or submerging your key fob in saltwater at the beach. If you suspect that your fob has been exposed to water, try putting it in a dry rice bag to pull the moisture back out. If this doesn't work your fob may require reprogramming by a professional locksmith or dealer. Water Damage Water damage can occur if you immerse the fob into the ocean, or wash it in a washing machine. Saltwater can cause the circuit board to short and eventually end up dying. It's not a good thing to submerge the fob in water however, don't give it up even if you accidentally drop the fob in water, or fail to remove it from your pocket. First, remove the battery from the fob. Clean the electronic chip using isopropyl or a similar product and dry it completely before replacing the battery. Check the fob to determine if it's functioning. If the key does not work, it might need to be changed. This is typically handled by a dealer or professional auto locksmith. If the key is more recent and has not been programmed to your car It will most likely need to be replaced completely. A professional locksmith for cars can complete this simple process. The locksmith will need the key to be cut to match your car's ignition. The locksmith will also need to reprogram your fob into the vehicle's system. This is a cheap and quick process that could be completed in the same day. Receiver Module Issues One of the simplest reasons your 500 key fob may stop working is because it's out of range. The remote has a range of 30 feet, so when you're too far away from your vehicle it won't respond to your commands. This can be easily fixed by moving it closer to your vehicle until it starts responding. If fiat 500 replacement key fob fob isn't working after you replace the battery in the coin, also called a “button”, “watch” or “button” It could be due to an issue with the circuit board inside. Reprogramming the fob typically resolves this problem. You can find the instructions for the majority of vehicles on YouTube or in the owner's manual. It's possible that you need to replace the metal clips that hold the coin battery. If they lose tension, it can prevent the battery from being properly seated and result in the malfunction of your remote. In rare cases the fob could be out of connection with your vehicle as a result of software or hardware problems. You can fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain instances, the software may also require reinstallation into your body control modules. Interference In addition to a dead battery on a coin The key fob may not be able to transmit or receive signals due to interference. This may happen if the keyfob is located in close proximity to a radio transmitter, such as a cell phone or radar detector. The key fob might not function due to a poor connection to the buttons, water damage or damage to the internal chips. If the key fob stopped working one day in the middle of the night, or after trying everything you can at home to solve it e.g. replacing the battery, reprogramming it and using the spare key fob, you could have a defective receiver module on your 500. The receiver module, which is located under the dashboard, detects radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. There's a quick and easy way to reset the 500's internal system, including the keyfob. Disconnect the battery for 15 minutes, removing first the negative cable, then the positive cable. Reconnect the battery. This will get rid of any remaining electricity and restart the car's computer system, which can help the key fob to function again. If the issue continues, you should speak with an expert technician. They will be able to determine the root of your problem.