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Reasons Your Fiat 500 Key Fob Won't Work A key fob for Fiat 500 makes it simple to open doors and start your vehicle. There are many reasons why the fob may 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 that looks like the Ilco brand. It needs to be professionally programmed (click here to find local automotive locksmiths). Includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the main reason for your 500 key fob that isn't working. Modern key fobs have only a limited range of operation and must be within only a few inches from the vehicle in order to function. If you are not within your vehicle and you press the keyfob button it will not respond, and display the message “Key Fob Not Detected”. If this happens, replace the battery on your coin cell (Part number CR2032) with a brand new one from a reliable brand such as Panasonic, Duracell, or Energizer. fiat doblo key The Key Lab can usually find them in your local hardware store or on the internet. You can test the battery of your coin-cell by pressing the buttons while standing close to your Fiat 500. The parking lights will flash and the key fob will operate the lock and unlock switches. If the key fob won't work after replacing the battery, it could be damaged by water, which prevents it from communicating with the receiver module inside your car. Water damage can happen in a variety of ways, ranging from small splashes to submerging the fob in salt water at the beach. If you think your fob was exposed to water, you can place it in a rice bag to draw out the moisture. 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 occur when you immerse the fob in the ocean or wash it in a washer. Saltwater can cause the circuit board to short, and eventually die. It's not the best idea to let the fob get wet however, don't give it up in the event that you accidentally drop it in the water or don't take it out of your pocket. Remove the battery first. Before replacing the battery, clean the electronic chip with isopropyl or another similar product. Next check the fob to verify if it is working. If the fob doesn't work, it may have to be changed. This is usually done by a professional or dealer auto locksmith. If the key is older and has not been programmed to your vehicle, it will likely need to be replaced 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 car's ignition. They'll also have to reprogram the fob to the system of your car. It's a simple and inexpensive process that can be completed in the next day. Receiver Module Issues One of the simplest reasons why your 500 key fob may stop functioning is because it's out of range. The remote usually has an operating range of 30 feet or less, and if it's too far from your vehicle, it won't respond to your commands. This can be fixed by moving it closer to your vehicle until it begins responding. If you've replaced your coin battery (commonly called”button” or “button” or “watch”) and your fob still won't work It could be because of an internal circuit board problem. In the majority of cases, reprogramming your fob can resolve the issue. There are instructions on how to do this for the majority of automobiles by searching YouTube or consulting the owner's manual. It is possible to replace the metal clips that hold the coin batteries in the correct position. If they loose tension, it can prevent the battery from being seated properly and could cause the remote to malfunction. In rare instances, the fob may be out of sync with your vehicle because of software or hardware problems. This could be a huge trouble, but you could usually fix it by visiting an auto locksmith to reprogram your fob for you. In certain instances the software might require reinstallation into your body control modules. Interference In addition to a dead battery on a coin, the key fob may not be receiving or transmitting the signal due to interference. This is possible when the key fob is located near a radio transmitter (cell phones, radar detectors) or another source of electromagnetic radiation. The key fob might not work due to a poor connection to the buttons, water damage or damage to the internal chips. If your key fob suddenly stopped working, or if you've tried everything at home to fix it (e.g. You may have a faulty 500 receiver module if you've tried replacing the battery, reprogramming, and using a spare key fob. The receiver module is situated 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 translated by the vehicle. There's a simple method 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 remove any remaining electrical charge, and then restart the computer of your car. This can help you get your key fob working again. If the problem persists, you should consult a certified technician. They'll be able determine the root of your issues.