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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a convenient method to unlock the doors and get started the car. There are many reasons the fob could stop working. These include a dead battery, damaged receiver module, water damage issues, or interference. This listing is for a NEW replacement Fiat Flip Key Remote that looks like the Ilco brand. It needs to be professionally programmed (click here to find local automotive locksmiths). Includes trunk, lock and unlock buttons. Dead Coin Battery The most common reason your 500 key fob doesn't function is due to an inactive battery. Modern key fobs have a limited range of operation and must be within just a few inches of the vehicle to work. If you're far from your car and push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this happens, replace the coin-cell battery (Part Number CR2032) by a brand new one of a trusted brand like Panasonic Duracell or Energizer. They can be found in your 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 should flash and the key fob will operate the lock and unlock switch. If your key fob isn't working after replacing the battery, it may be water damage which prevents it from connecting to the module inside your vehicle. Water damage can occur in many ways, such as a simple splash or submerging the key fob 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, your fob will probably need to be reprogrammed by a professional auto locksmith or dealer. Water Damage While the fob has some rubber seals to keep water out of the chip's electronic circuit, 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 die. If you get the fob wet, it's not an ideal idea but if you drop it in the water in a cup or do not remember to remove it from your pants pocket before running the washer do not give up hope. First, remove the battery from the fob. Clean the electronic chip with isopropyl alcohol or a similar product and then dry it completely before replacing the battery. Check the fob again to see if it is working. If the fob doesn't work, it may need to be reprogrammed. This is usually done by an auto locksmith or dealer. If your key is older and is not programmed for your vehicle, you will need to replace it completely. This is a simple procedure that can be carried out by a professional automotive locksmith. The locksmith will need to cut the key to match the ignition of your car. The locksmith will also need to program your fob into the vehicle's system. This is a cheap and quick process that can be completed in the same day. Receiver Module Issues Your 500 key fob might be inoperable because it's out of range. The remote's range is of 30 feet, so when you're too far away from your vehicle it won't be able to respond to your commands. You can easily remedy this by moving your remote closer to your vehicle until it responds. If your fob won't work after you replace the coin battery, also known as a “button”, “watch” or “button”, it may be due to a malfunction on the internal circuit board. Reprogramming the fob usually resolves this issue. There are instructions on how to do this for all vehicles by searching YouTube or checking out the owner's manual. You may have to replace the metal retaining clips that keep the coin battery in place. If they loose tension, it can prevent your coin battery from sitting properly, causing your remote to malfunction. In rare instances it is possible that the fob will become desync'd with your vehicle due to software issues or hardware issues. This could cause a significant issue, but you are able to usually fix it by visiting a local dealer or auto locksmith to reprogram your fob for you. In replacement key fiat 500 , the software may also need to be reinstalled in your body control modules. Interference Interference can also cause the key fob not to receive or transmit signals. This could happen when the keyfob is located in close proximity to a radio transmitter like a cellphone or radar detector. Other reasons why the key fob might not work include a poor connection to the buttons, damage to the internal chip or water damage. If your key fob suddenly stopped working, or if you've tried everything at home to resolve it (e.g. You might have a damaged 500 receiver module if you've tried replacing the battery, reprogramming it, or using a spare key fob. The receiver module, which is located beneath the dashboard, picks up radio frequency signals from your key fob. It converts the signals into electronic commands that are then interpreted by the vehicle. There's a quick and easy way to reset the 500's in-board system, including the keyfob. Disconnect the battery 12 volt for about 15 minutes, by removing the negative cable first then the positive cable. Then reconnect the battery. This will get rid of any residual electricity and restart the car's computers. This can help the key fob to function again. If the issue persists it is recommended that you consult an expert certified technician. They'll be able to identify the root cause of your problems.