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Reasons Your Fiat 500 Key Fob Won't Work A key fob for the Fiat 500 is a convenient way to open the doors and begin the car. There are a variety of reasons why the fob won't work. These include a dead coin battery or water damage, receiver module problems, and interference. This listing is for a NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It has to be professionally programmed (click here to search for local locksmiths in the automotive industry). It comes with 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 only have only a limited range of operation and must be within a few inches of your vehicle in order to work. If you are further away from your vehicle, and you press the keyfob button it won't respond and display the message “Key Fob Not Detected”. If this happens, simply replace the coin cell battery (Part number CR2032) with a new one from a reputable brand such as Panasonic, Duracell, or Energizer. You can find them at the local hardware store or online. You can test the battery of your coin-cell by pressing the buttons while standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switch. If your key fob does not work after replacing the battery, there may be water damage that has prevented it from connecting to the module in your vehicle. Water damage can happen through a variety of methods, including simply splashing or submerging the key fob in saltwater at the beach. If you suspect your fob has been exposed to water, you can try placing it in a dry rice bag to pull the moisture back out. If this fails, you'll have to get your fob reset by an auto locksmith or a dealer. Water Damage The fob does have rubber seals that keep water from the chip's electronic circuit and out of the ocean or washing it in a machine could cause water damage. Saltwater is particularly dangerous to the fob's circuit board and can cause it to short out and eventually end up dying. It's not a good idea to soak the fob in water, but don't give it up even if you accidentally drop the fob in water or fail to remove it from your pocket. First take the battery off the fob. Clean the electronic chip with isopropyl alcohol or a similar product and then dry it thoroughly before replacing the battery. Next, test the fob to test if it works. If the key doesn't function, it may have to be programmed again. This is usually handled by an auto locksmith or dealer. If your key is older and not programmed for your car then you'll need to replace it completely. A professional locksmith for cars can complete this simple process. The locksmith will need the key cut to match your vehicle's ignition. G28 Car Keys 'll also need to reprogram the fob to your car's system. This is a fast and inexpensive process that can usually be completed in the same day. Receiver Module Issues Your 500 key fob may not work because it's out of range. The remote has a range of 30 feet. Therefore, if you are 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 begins responding. If you've replaced the coin battery (commonly called”button” or “button” or “watch”) and your fob still won't work, it could have an internal circuit board problem. In the majority of cases, reprogramming your fob will resolve this problem. The instructions are available for the majority of 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 it could hinder the coin battery from sitting properly and result in the malfunction of your remote. In rare cases, the fob may become desync'd with your vehicle because of software or hardware issues. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain situations, they may need to reinstall the program in your body control module, as well. Interference In addition to a dead coin battery, the key fob may not be able to transmit or receive signals due to interference. This could occur if the key fob is close to an electronic radio transmitter (cell phones and radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob could not function could be due to a weak connection to the buttons, damage to the internal chip, or water damage. If the key fob has failed to work one day suddenly and you've tried every option at home to solve it e.g. You may have a faulty 500 receiver module If you've tried replacing it with a battery, reprogramming, and using an alternative key fob. The receiver module is situated under the dash and receives the radio frequency signals from the key fob. It then converts them into electronic commands that the vehicle interprets. There is a straightforward method to reset the 500's on-board system including the keyfob. Disconnect the battery of 12 volts for about 15 minutes, by disconnecting the negative cable first then the positive cable. Then reconnect the battery. This will clear out any remaining electrical charge and restart the car's computers. This could allow you to get your key fob working again. If the issue persists it is recommended that you consult an expert technician. They will be able diagnose the root of any issues.