Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a handy way to open the doors and begin the car. However, there are numerous reasons why the fob won't be working. It could be due to a dead battery or damage to the receiver module, water issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote - look-alike Ilco brand that must be professionally programmed by a local automotive locksmith (click here to search for a Locksmith Search). Includes trunk, lock and unlock buttons. Dead Coin Battery The most common reason your 500 key fob won't function is due to an inactive battery. Key fobs of today have an operating range that is limited and must be within just a few inches of the vehicle in order to function. If you are far from your vehicle, and you press the key fob button the car won't respond and will display a "Key Fob Not Detected" message in the instrument cluster. If this occurs If this happens, replace the battery in the coin-cell (Part Number CR2032) with a new battery from a reputable brand like Panasonic Duracell or Energizer. You can find them in the local hardware store or online. After you've changed the battery on the coin cell You can test it by standing near your Fiat 500 and pressing the buttons. The parking lights will flash and the key fob should operate the lock and unlock switch. If your key fob isn't working after replacing the battery, there may be water damage which hinders it from interacting with the module in your vehicle. Water damage can occur in many ways, including the simple splash or submerging the key fob in saltwater at the beach. If you suspect that your fob was exposed to water, put it in a rice bag to draw out the moisture. If this isn't working, you'll need to have 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 it, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to become shorted and eventually cease to function. It's not a good idea to get the fob wet however, don't give it up in the event that you accidentally drop it in water, or fail to take it out of your pocket. First remove the battery from the fob. Clean the electronic chip using isopropyl alcohol or a similar product and dry it completely before replacing the battery. Check the fob again to check if it's functioning. If the key still doesn't work, it may need to be reprogrammed. This is usually handled by an auto locksmith or dealer. If your key is older and not programmed for your car it is necessary to replace it completely. This is a simple process that can be carried out by a professional locksmith for automotive use. The locksmith will require the key to be cut to match your car's ignition. The locksmith will also have to reprogram your fob into the vehicle's system. This is a low-cost and fast process that can be completed the same day. Receiver Module Issues Your 500 key fob may stop working because it is out of range. The remote usually has an operating range of 30 feet or less and if it's 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 you've replaced the coin battery (commonly known as"button" or "button" or "watch") and the fob won't work it could be due to an internal circuit board problem. Reprogramming the fob is usually the solution to the issue. You can find the steps for most vehicles on YouTube or in the owner's manual. You may need to replace the metal retaining clips that keep the battery of your coin in place. If they lose tension, it could hinder the coin battery from being properly seated and can cause your remote to malfunction. In rare cases it is possible that the fob will become desync'd with your vehicle due to software issues or hardware issues. It is possible to fix this issue by visiting your local auto-locksmith or dealer to reprogram your key fob. In some instances the software may need to be reinstalled in your body control modules. https://www.thekeylab.co.uk/fiat-car-keys/ can also cause the key fob to be unable to receive or transmit signals. This may happen if the key fob is in close proximity to a radio transmitter like a cellphone or radar detector. Other reasons why the key fob may not function could be due to a weak connection to the buttons or damage to the internal chip, or water damage. If your key fob suddenly stopped working, or you have tried everything at home to solve the issue (e.g. You may have a faulty 500 receiver module if you've tried replacing the battery, reprogramming, and using an alternative key fob. The receiver module is located under the dash and is able to pick up the radio frequency signals from the key fob. It transforms the signals into electronic commands which are then translated by the vehicle. There is a straightforward method to reset the 500's in-board system including the keyfob. Disconnect the battery for 15 minutes by removing first the negative cable, then the positive cable. Reconnect the battery. This will remove any remaining electrical charge, and then restart the computer of your car. This can help get your key fob working again. If the issue continues it is recommended that you consult an experienced technician. They will be able to determine the root cause of any problems.