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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 is a great way to open the doors and begin the car. There are many reasons the fob could stop working. These include a dead coin battery, damage to the receiver module, water issues, and interfering. This listing is for a NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that must be professionally programmed by a local locksmith (click here to search for a Locksmith Search). This remote includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably the most common cause of your 500 key fob being inoperative. Modern key fobs come with a limited range of operation, and should be within only a few feet from the car to operate. 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 occurs then replace the battery for your coin-cell (Part Number CR2032) by a brand new one of a reliable brand, such as Panasonic Duracell or Energizer. They can be found in the local hardware store or on the internet. You can test the battery on your coin-cell by pressing the buttons while standing near your Fiat 500. The parking lights will flash and the key fob will operate the lock and unlock switches. If the key fob doesn't work after replacing the battery, it could have water damage that stops it from connecting to the receiver module inside your vehicle. Water damage can happen in a variety of ways, ranging from the slightest splash to submerging the fob salt water at the beach. If you believe your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this does not work, you'll have to get your fob changed by an auto locksmith or dealer. Water Damage While the fob has some rubber seals to keep water out of the chip's electronic circuit and out of the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to short, and eventually die. Getting the fob wet is not a good idea however, if you drop it in the water in a cup or do not remember to remove it from your pants pocket prior to running the washer and you don't have a chance, don't give in. First remove the battery from the fob. Clean the electronic chip using isopropyl alcohol or another similar product and dry it completely before replacing the battery. Then, test the fob to verify if it is working. If the key doesn't work, it may need to be programmed again. This is usually done by an auto locksmith or dealer. If your key is older and is not programmed for your vehicle it is necessary to replace it completely. This is a simple procedure that can be carried out by a professional automotive locksmith. The locksmith will require the key cut to match your vehicle's ignition. They will also need to reprogram the fob for your vehicle's system. This is a simple and affordable process that is usually completed in the next day. Receiver Module Issues Your 500 key fob may not function because it's out of range. The remote typically has an operating range of 30 feet or less, and if it's too far away from your car it will not respond to your commands. It is possible to fix this by moving the remote closer to your car until it responds. If your fob doesn't work after replacing the battery inside the coin, which is also known as a “button”, “watch” or “button” or “button”, it may be due to a malfunction on the circuit board inside. In the majority of cases, reprogramming your fob will resolve this issue. You can find instructions on how to do this for the majority of automobiles by searching YouTube or looking through the owner's manual. You may have to replace the metal clips that hold the coin battery in place. If fiat doblo key programming thekeylab.co.uk become loose, it may prevent your battery from being properly seated, causing your remote to malfunction. In rare cases the fob could be desync'd with your vehicle due to software problems or hardware issues. This can be a major issue, but you are able to frequently fix this issue by visiting an auto locksmith to have them reprogram your fob. In some instances the software may need to be reinstalled in your body control modules. Interference In addition to a dead coin battery The key fob may not be able to receive or transmit signals due to interference. This could happen when the key fob is in close proximity to a radio transmitter like a cellphone or radar detector. Other reasons the key fob could not function could be due to a weak connection to the buttons or the internal chip, or water damage. If your key fob suddenly stopped working, or if you've tried everything at home to resolve it (e.g. replacing the battery, reprogramming it and using the spare key fob, you might have a malfunctioning receiver module on your 500. The receiver module is located under the dash, and it picks up the radio frequency signals from the key fob. Then, 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 device, including the key fob. Disconnect the battery for 15 minutes by removing first the negative cable and then the positive cable. Reconnect the battery. This will eliminate any remaining electrical charge and restart the car's computer system, which can help get your key fob working again. If the issue continues you should seek out an expert technician. They will be able to identify the exact cause of problems.