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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. However, there are a variety of reasons why the fob won't be working. This could be due to a dead battery or water damage, issues with the receiver module, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It must be professionally programmed (click here to find local locksmiths in the automotive industry). This remote includes trunk, lock and unlock buttons. Dead Coin Battery A dead battery is the most common cause of your 500 key fob being inoperative. Modern key fobs have an operating range that is limited and must be within a few inches of your vehicle to work. If you're far from your vehicle, and you press the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this occurs you need to replace the battery of your coin-cell (Part Number CR2032) with a new battery of a trusted brand such as Panasonic Duracell or Energizer. You can usually find them in your local hardware store or on the internet. You can test the coin-cell battery by pressing the buttons while standing close to your Fiat 500. The parking lights should flash and the key fob will operate the lock and unlock switches. If the fob's remote doesn't work after replacing the battery, it could have water damage that prevents it from communicating with the receiver module in your car. Water damage can happen in a number of ways, ranging from the slightest splash to submerging your fob in salt water 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 out. If this isn't working, you'll have to get your fob changed by an auto locksmith or a dealer. Water Damage Water damage can happen if you immerse the fob in the ocean, or wash it in a washing machine. Saltwater can cause the circuit board to short and then die. It's not the best idea to submerge the fob in water however, but don't give it up even if you accidentally drop the fob in water or forget to remove it from your pocket. First, remove the battery. Before replacing the battery, clean the electronic chip with isopropyl or similar products. Then try the fob and test if it works. If the key doesn't function, it may need to be programmed again. This is usually handled by an auto locksmith or dealer. If the key is a newer model and was not programmed to your car It will most likely need to be replaced completely. This is a simple procedure which can be accomplished by a professional automotive locksmith. The locksmith needs to cut the key to match the ignition of your vehicle. They'll also need to program the fob into the system of your car. This is a low-cost and quick process that can be completed the same day. Receiver Module Issues The 500 key fob could not work because it's out of range. The remote usually has an area of 30 feet or less, and if it's too far away from your car it will not respond to your commands. You can easily fix this by moving the remote closer to your vehicle until it responds. If you've replaced the battery on your coin (commonly known as”button” or “button” or “watch”) and your fob doesn't function it could be due to an internal circuit board problem. Reprogramming the fob typically resolves this issue. You can find the steps for most vehicles on YouTube or in the owner's guide. It is possible to replace the clips made of metal that hold the coin batteries in the correct position. If they lose tension, it could hinder the coin battery from being seated properly and can cause your remote to malfunction. In rare cases the fob could be out of sync with your vehicle because of hardware or software problems. This could be a huge trouble, but you could usually fix it by visiting a local dealer or auto locksmith to reprogram your fob. In some instances they might need to reinstall the software on your body control module, too. Interference Interference can also cause the key fob to be unable to receive or transmit signals. This could occur if the key fob is in close proximity to a radio transmitter, such as a cell phone or radar detector. Other reasons why the key fob might not function may be a lack of connection to the buttons or the internal chip, or water damage. If fiat doblo key has suddenly stopped working, in the middle of the night or after trying every option at home to fix it e.g. battery replacement, reprogramming and using the spare key fob, you 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 transforms the signals into electronic commands, which are then processed by the vehicle. Fortunately, there's an easy method to reset all of the on-board systems in your 500, including the key fob. Disconnect the 12 volt battery for about 15 minutes by disconnecting the negative cable first then the positive cable. Reconnect the battery. This will remove any remaining electricity, and allow you to restart the computer of your car. This could help you get your key fob to work again. If the problem persists you should seek out an expert technician. They'll be able diagnose the exact cause of your problem.