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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a convenient way to open the doors and start the car. However, there are a variety of reasons why the key fob might stop working. It could be due to a dead battery, damage to the receiver module, water issues, or interference. This listing is for a NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that needs to be programmed professionally by a local locksmith (click here for Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most common reason your 500 key fob doesn't function is the battery is dead. Modern key fobs have a very restricted operating range, and must be within a few feet of the vehicle to function. If you are further away from your car and press the keyfob button, it will not respond, and display the message “Key Fob Not Detected”. If this happens you need to replace the battery of your coin-cell (Part Number CR2032) by a fresh one of a trusted brand like Panasonic Duracell or Energizer. They are typically available in your local hardware store or online. After you've replaced the battery of your coin cell It is possible to test it by standing in front of your Fiat 500 and pressing the buttons. The parking lights should light up and the key fob should operate the lock and unlock switch. If your key fob isn't working after replacing the battery, there might be water damage that prevents it from communicating with the module inside your vehicle. Water damage can happen in a variety of ways, such as the simple splash or submerging the key fob into 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 draw the moisture back out. If this doesn't work, you will need to have the fob replaced by an auto locksmith or dealer. Water Damage While the fob has some rubber seals that keep water out of the chip's electronic circuit and out of the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to short and eventually fail. In the event that you let your fob get wet, it's not an option, but if you drop it in a glass of water or fail to remove it from your pants pocket prior to running the washing machine do not give up hope. Take the battery off first. Before replacing spare key for fiat 500 , clean the electronic chip with isopropyl, or a similar product. Check the fob to see if it is functioning. If the key does not function, it may need to be programmed again. This is usually done by an auto locksmith or dealer. If the key is more recent and has never been programmed to your car It is likely that it needs to be replaced completely. A professional locksmith for automotive can do this job. The locksmith will need the key cut to match the car's ignition. They will also need to reprogram the fob in your car's system. This is an affordable and quick process that can be completed within the same day. Receiver Module Issues One of the most common reasons your 500 key fob won't be functioning is that it's out of range. The remote has a maximum range of 30 feet. So when you're too far from your vehicle it won't be able to respond to your commands. This can easily be resolved by moving it closer to your vehicle until it starts responding. If your fob doesn't work after replacing the battery for the coin, also called a “button”, “watch” or “button” It could be due to a problem with the internal circuit board. In the majority of cases, reprogramming your fob will solve the issue. There are instructions on how to do this for all automobiles by searching YouTube or looking through the owner's manual. You may have to replace the metal clips that hold the coin battery. If they lose tension it can prevent your coin battery from being properly seated, causing your remote to malfunction. In rare cases the fob can become out of alignment with your vehicle because due to hardware or software issues. This could cause a significant headache, but you can usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob. In certain situations they may have to install the software again in your body control module, as well. Interference Interference can also cause the key fob to not receive or transmit a signal. This may happen if the keyfob is located in close proximity to a radio transmitter, such as a cell phone or radar detector. Other reasons the key fob might not work could be due to a weak connection to the buttons, damage to the internal chip, or water damage. If the key fob stopped working one day out of the blue, or after trying everything you can at home to solve it e.g. You could have a malfunctioning 500 receiver module after you've tried replacing the battery, reprogramming it, or using a spare key fob. The receiver module, located beneath the dashboard, detects radio frequency signals from your key fob. It converts the signals into electronic commands which are then translated by the vehicle. There is a simple way to reset the 500's onboard 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 erase any remaining electricity, and allow you to restart the car's computer. This can help you get your key fob to work again. If the problem persists it is recommended that you consult a certified technician. They can identify the root cause of your problems.