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Reasons Your Fiat 500 Key Fob Won't Work A key fob for Fiat 500 makes it easy to open doors and start your car. There are many reasons the fob may stop working. These include a dead battery damage to the receiver module, issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote that is similar to the Ilco brand. It has to be professionally programmed (click here to find local automotive locksmiths). Includes lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob not functioning. Modern key fobs have a very restricted operating range, and must be within a few feet of the vehicle to operate. If you're not close to your vehicle, and you press the key fob button, the car won't be able to respond, and will display a “Key Fob Not Detected” message in the instrument cluster. If this happens If this happens, replace the battery in the coin-cell (Part Number CR2032) by a fresh one from a reputable brand like Panasonic Duracell or Energizer. You can usually find them in your local hardware store or online. After you've replaced the battery of your coin cell you can test it by standing close to your Fiat 500 and pressing the buttons. The parking lights should light up and the key fob will operate the lock and unlock switch. If the key fob won't function after replacing the battery, it could have water damage that prevents it from communicating with the receiver module inside your car. Water damage can happen in many ways, including simply splashing or submerging the key fob saltwater at the beach. If you suspect your fob has been exposed to water, try putting it in a dry rice bag to pull the moisture out. If this doesn't work, your fob may need to be reset by an experienced auto locksmith or by the dealer. Water Damage Although the fob is equipped with rubber seals to keep water from the chip's electronic circuit and out of the ocean or washing it in a machine can cause water damage. Saltwater is particularly dangerous to the circuit board of the fob which causes it to short out and eventually end up dying. Getting the fob wet is not an ideal idea, but if you drop it into a cup of water or don't remember to take it out of your pants pocket prior to running the washing machine Don't give up hope. First take the battery off the fob. Before replacing the battery clean the electronic chip using isopropyl or another similar product. Then try the fob and verify if it is working. If the key does not work, it may need to be reprogrammed. This is usually done by a professional or dealer auto locksmith. If the key is more recent and was not programmed to your vehicle, it will likely need to be replaced completely. A professional automotive locksmith will be able to complete this process. The locksmith will need to cut the key to match the ignition of your car. The locksmith will also have to reprogram the fob into the car's system. This is a fast and inexpensive process that can be completed on the same day. Receiver Module Issues The 500 key fob you have may stop working because it is out of range. The remote typically has an operating range of 30 feet or less and if it's far from your vehicle, it won't respond to your commands. This can be fixed by moving closer to your vehicle until it starts responding. If your fob doesn't work after you replace the battery inside the coin, which is also known as a “button”, “watch” or “button” It could be due to an issue with the circuit board inside. In the majority of cases, reprogramming your fob will resolve this problem. You can find instructions on how to do this for all vehicles by searching YouTube or checking out the owner's manual. It is possible to replace the metal clips that hold the coin battery. If they loose tension, it may prevent your battery from sitting properly, causing your remote to malfunction. In rare cases the fob could be disconnected from your vehicle due to software issues or hardware issues. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In some instances the software might require reinstallation to your body control modules. Interference In addition to a dead battery on a coin The key fob might not be receiving or transmitting signals due to interference. This may happen if the keyfob is in close proximity to a radio transmitter like a cell phone or radar detector. The key fob may not work due to a poor connection with the buttons water damage or damage to the internal chips. If the key fob has stopped working one day out of the blue, or after trying everything you can at home to fix it e.g. You may have a faulty 500 receiver module If you've tried replacing it with a battery, reprogramming it, or using an alternative key fob. fiat 500 key is situated 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 read by the vehicle. There is a simple way to reset the 500's in-board system, including the keyfob. 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 electricity and then restart the car's computers, which can help the key fob to function again. If the issue persists you should seek out an expert certified technician. They can identify the root cause of any issues.