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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 allows you to easily open doors and start your car. However, there are a variety of reasons why the fob may stop functioning. This could be due to a dead battery and water damage, as well as receiver modules issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It has to be professionally programmed (click here to find local locksmiths for automotive locksmiths). Includes fiat punto key replacement , unlock, and trunk buttons. Dead Coin Battery A dead battery is the most common cause of your 500 key fob not working. Modern key fobs have a very limited operating range, and should be within only a few feet from the vehicle to function. If you're far from your car and hit the keyfob, it will not respond, and display the message “Key Fob Not Detected”. If this happens then replace the battery for your coin-cell (Part Number CR2032) by a fresh one of a reputable brand such as Panasonic Duracell or Energizer. You can usually find them in your local hardware store, or online. You can test the battery of your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The car will blink its parking lights and the key fob should work the lock and unlock buttons. If the key fob won't work after replacing the battery, it may have water damage that prevents it from connecting to the receiver module inside your vehicle. 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 suspect that your fob has been exposed to water, place it in a rice bag to draw out the moisture. If this doesn't work, you will need to have the fob changed by an auto locksmith or a dealer. Water Damage Water damage can occur when you submerge the fob in the ocean or wash it in a washing machine. Saltwater can cause the circuit board to become shorted and eventually cease to function. If you get the fob wet, it's not an ideal idea, but if you drop it in the water in a cup or forget to remove it from your pocket before you run the washing machine do not give up hope. First take the battery off the fob. Clean the electronic chip with isopropyl alcohol or another similar product and dry it thoroughly before replacing the battery. Test the fob next to determine if it's working. If the key does not function, it may need to be reprogrammed. This is typically handled by a dealer or professional auto locksmith. If the key is older and has not been programmed to your car It is likely that it needs to be replaced completely. This is an easy process that can be carried out by a professional automotive locksmith. The locksmith will require the key cut to match the car's ignition. The locksmith also needs to reprogram the fob into the vehicle's system. This is a simple and inexpensive process that can be completed on the next day. Receiver Module Issues Your 500 key fob may not function because it's out of range. The remote has a range of 30 feet. So in the event that you are far from your vehicle it will not respond to your commands. It's easy to remedy this by moving your remote closer to your car until it responds. If your fob does not work after replacing the battery inside the coin, which is also called a “button”, “watch” or “button” it may be due to a malfunction on the circuit board inside. In the majority of cases, reprogramming your fob will fix the problem. You can find the steps for most vehicles on YouTube or in the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in the correct position. If they loose tension they could stop the battery from being properly seated and can cause your remote to malfunction. In rare cases the fob could be out of the vehicle's sync because due to hardware or software issues. This could be a huge issue, but you are able to often fix this by visiting a local dealer or auto locksmith to have them reprogram your fob for you. In certain instances, the software may also require reinstallation in your body control modules. Interference Interference can also cause the key fob to not receive or transmit the signal. This could happen if the key fob is near the radio transmitter (cell phones and radar detectors) or any other source of electromagnetic radiation. The key fob could not function because of a problem to the buttons, water damage or damage to the internal chips. If the key fob has suddenly stopped working, in the middle of the night and you've tried everything you can do at home to solve it e.g. replacing the battery, reprogramming it and using the spare key fob, you may have a defective receiver module on your 500. The receiver module is situated under the dash and is able to pick up the radio frequency signals from the key fob. It converts them into electronic commands that the vehicle interprets. Fortunately, there's an easy method to reset all of the onboard systems in your 500 and include the key fob. Disconnect the battery of 12 volts for about 15 minutes by removing the negative cable and then the positive cable. Reconnect the battery. This will remove any remaining electricity and then restart the car's computers, which could allow you to get your key fob working again. If the issue continues, you should seek the advice of an expert technician. They will be able to determine the exact cause of your problems.