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Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a convenient way to open the doors and begin the car. However, there are numerous reasons why the fob won't be working. fiat 500 key fob replacement could be due to a dead coin-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 locksmiths for your vehicle). It includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most common cause of your 500 key fob that isn't working. Modern key fobs have a very limited operating range and must be within a few feet of the car to operate. If you are not within your vehicle and you hit the keyfob, it will not respond and display the message “Key Fob Not Detected”. If this happens, simply replace the battery in the coin cell (Part number CR2032) by a new one from a reputable brand like Panasonic, Duracell, or Energizer. They are available at your local hardware store, or on the internet. You can test the coin-cell battery by pressing the buttons while you're standing close to your Fiat 500. The parking lights should blink and the key fob will operate the lock and unlock switches. If your key fob still isn't working after replacing the battery, there may be water damage that is preventing it from interacting with the module in your vehicle. Water damage can occur through a variety of methods, including the simple splash or submerging your key fob in saltwater at the beach. If you suspect that 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 doesn't work, you will need to have the fob reset by an auto locksmith or a dealer. Water Damage While the fob comes with rubber seals to keep water out of the chip's electronic circuit the device, submerging it into the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short and then fail. It's not a good idea to submerge the fob in water however, don't give it up if you accidentally drop it in the water or don't take it out of your pocket. First remove the battery from the fob. Before replacing the battery, clean the electronic chip using isopropyl, or a similar product. Test the fob next to check if it's functioning. If the fob doesn't function, it may need to be changed. This is usually handled by an auto locksmith or dealer. If the key is more recent and was not programmed to your vehicle it is likely to need to be replaced completely. A professional locksmith in the automotive industry can do this job. The locksmith will require the key to be cut to match your car's ignition. They'll also need to reprogram the fob to your vehicle's system. This is an affordable and quick process that can be completed within the same day. Receiver Module Issues The 500 key fob could be inoperable because it's out of range. The remote's range is of 30 feet, so should you be too far from your vehicle it won't respond to your commands. It's easy to fix this by moving the remote closer to your vehicle until it responds. If you've replaced the battery in your coin (commonly known as”button” or “button” or “watch”) and the fob won't work It could be because of an internal circuit board problem. Reprogramming the fob typically resolves the issue. You can find the steps for most vehicles on YouTube or in the owner's guide. It is possible to replace the metal clips that hold the coin battery. If they become loose, it can prevent your coin battery from being properly seated and cause your remote to malfunction. In rare cases the fob might become disconnected from your vehicle because of software or hardware issues. This can be a major headache, but you can frequently fix this issue by visiting a local dealer or auto locksmith to have them reprogram your fob. In certain instances it may be necessary to install the software again in your body control module as well. Interference Interference can also cause the key fob not to receive or transmit an signal. This could happen when the keyfob is located in close proximity to a radio transmitter such as a cell phone or radar detector. Other reasons why the key fob could not function include a poor connection to the buttons, damage to the internal chip or water damage. If your key fob suddenly stopped working, or you've tried everything at home to resolve it (e.g. replacing batteries, reprogramming or using the spare key fob, you could have a defective receiver module on your 500. The receiver module is located under the dash and receives the radio frequency signals from the key fob. It transforms the signals into electronic commands which are then read by the vehicle. There is a straightforward method to reset the 500's onboard system including the keyfob. Disconnect the battery for 15 minutes by taking off first the negative cable, then the positive cable. Reconnect the battery. This will eliminate any residual electricity and restart the car's computers. This could allow you to get your key fob working again. If the issue continues, you should consult an expert technician. They'll be able to determine the exact cause of your problem.