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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a handy way to unlock the doors and get started the car. There are many reasons the fob may stop working. This could be due to a dead coin battery or water damage, receiver module issues, and interfering. 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 search for local locksmiths for your vehicle). It includes lock, unlock, and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob being inoperative. Modern key fobs have a limited range of operation and must be within a few inches of your vehicle to function. If you're far from 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 coin cell battery (Part number CR2032) by a new one from a trusted brand such as Panasonic, Duracell, or Energizer. You can usually find them in your local hardware store, or online. After you've replaced the battery in the coin cell It is possible to test it by standing next to your Fiat 500 and pressing the buttons. The car should blink its parking lights, and the key fob should be able to operate the lock and unlock buttons. If your fob's key doesn't work even after replacing the battery, there could be water damage that hinders it from connecting to the module in your vehicle. Water damage can occur in a variety of ways, ranging from the slightest splash to submerging the fob into salt water at the beach. If you suspect that your fob was exposed to water, try placing it in a dry rice bag to pull the moisture out. If this doesn't work, you will need to have the fob replaced by an auto locksmith or a dealer. Water Damage Damage to the water supply can occur if you immerse the fob in the ocean, or wash it in a washer. Saltwater poses a particular risk to the circuit board of the fob, causing it to short out and eventually end up dying. It's not a good idea to get the fob wet however, don't give it up when you accidentally drop it in water or forget to remove it from your pants pocket. First, remove the battery. Clean the electronic chip with isopropyl alcohol or another similar product and dry it completely before replacing the battery. Test the fob next to verify if it's functioning. If the key doesn't work, it may need to be changed. This is usually done by an auto locksmith or dealer. If the key you have is older and is not programmed to work with your vehicle it is necessary to replace it completely. This is a simple procedure that can be completed by a professional locksmith for automotive use. The locksmith will need the key cut to match your car's ignition. They will also need to reprogram the fob to the car's system. This is a simple and cost-effective procedure which can be completed in the same day. Receiver Module Issues The 500 key fob you have may not function because it's out of range. The remote usually has an operating range of 30 feet or less, and if it's too far away from your car it won't respond to your commands. This can easily be resolved by moving closer to your vehicle until it starts responding. If your fob isn't working after you replace the coin battery, also known as a “button”, “watch” or “button”, it could be due to a problem with the internal circuit board. In most cases, reprogramming the fob can resolve the issue. There are instructions on how to do this for the majority of automobiles by searching YouTube or checking out the owner's manual. It is possible to replace the metal retaining clips that keep the battery of your coin in place. If they loose tension, it can stop your coin battery from sitting properly and cause your remote to malfunction. In rare cases, the fob may become disconnected from your vehicle due to software problems or hardware issues. TheKeyLab can be fixed by visiting your local auto-locksmith or dealer to reprogram your key fob. In certain situations, they may need to reinstall the software on your body control module, too. Interference Interference can also cause the key fob to be unable to receive or transmit a signal. This can occur when the keyfob is in close proximity to a radio transmitter, like a cellphone or radar detector. The key fob could not function due to a poor connection with 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 resolve it (e.g. battery replacement, reprogramming and using the spare key fob, you may have a malfunctioning receiver module on your 500. The receiver module, located beneath the dashboard, picks up radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. There is a straightforward method to reset the 500's internal system including the keyfob. Disconnect the battery for 15 minutes by taking off first the negative cable and then the positive cable. Then reconnect the battery. This will clear any residual electrical charge, and then restart the computer of your car. This could help you get your key fob to function again. If the issue continues, you should consult a certified technician. They will be able to diagnose the exact cause of your problems.