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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to open the doors and start the car. There are many reasons the fob won't work. It could be due to a dead battery, water damage, receiver module issues, or interference. This listing is for an NEW replacement Fiat Flip Key Remote – like the Ilco brand that needs to be programmed professionally by a local locksmith (click here for Locksmith Search). replacement fiat 500 key fob comes with trunk, lock and unlock buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob not working. Key fobs of today have limited operating range and must be within a few inches of your vehicle in order to function. If you are far from your vehicle and you push the keyfob button it will not respond and display the message “Key Fob Not Detected”. If this occurs you need to replace the battery of your coin-cell (Part Number CR2032) by a brand new one of a trusted brand like Panasonic Duracell or Energizer. You can find them in the local hardware store or online. You can test the battery in the coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should flash and the key fob will operate the lock and unlock switch. If the key fob doesn't function after replacing the battery, it could have water damage that prevents it from communicating with the receiver module in your car. Water damage can happen in a variety of ways, ranging from the slightest splash to submerging the fob salt water at the beach. If you suspect your fob was exposed to water, try placing it in a dry rice bag to pull the moisture back out. If that doesn't work the fob might need to be reset by a professional auto locksmith or the dealer. Water Damage Damage to the water supply can occur if you immerse the fob in the ocean or wash it in a machine. Saltwater is especially dangerous to the circuit board of the fob that can cause it to short out and eventually die. The fob getting wet is not a good idea but if you drop it into a cup of water or don't remember to remove it from your pants pocket prior to running the washer, don't give up hope. First, remove the battery. Before replacing the battery, clean the electronic chip with isopropyl or another similar product. Test the fob afterward to see if it is functioning. If the key does not function, it may need to be changed. This is usually done by an auto locksmith or dealer. If your key is old and has not been programmed for your vehicle it is necessary to replace it completely. A professional locksmith for cars can do this job. The locksmith will need the key to be cut to match the car's ignition. The locksmith will also need to reprogram your fob into the vehicle's system. This is a cost-effective and quick process that can be completed 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 range of 30 feet, so in the event that you are far from your vehicle it won't be able to respond to your commands. It can be solved by moving closer to your vehicle until it starts responding. If you've replaced the coin battery (commonly called”button” or “button” or “watch”) and your fob still won't work, it could have an internal circuit board issue. In most cases, reprogramming the fob will resolve this problem. You can find the instructions on how to do this for most vehicles by searching YouTube or reading the owner's manual. It is sometimes necessary to replace the clips made of metal that hold the coin batteries in place. If they become loose, it may prevent your battery from sitting properly, causing your remote to malfunction. In rare cases the fob might become desync'd with your vehicle because of software or hardware issues. This issue can be fixed by visiting your local dealer or auto-locksmith to reprogram your key fob. In some cases, they may need to reinstall the program in your body control module too. Interference In addition to a dead coin battery the key fob could not be able to receive or transmit a signal due to interference. This is possible when the key fob is located near an electronic radio transmitter (cell phones and radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob may not function include a weak connection to the buttons, damage to the internal chip, or water damage. If your key fob suddenly stopped working, or you've tried everything at home to resolve it (e.g. replacing the battery, reprogramming it and using the spare key fob, you may have a defective receiver module on your 500. The receiver module, located beneath the dashboard, detects radio frequency signals from your key fob. It converts them to electronic commands that the vehicle interprets. There's a quick and easy way to reset the 500's in-board system, including the keyfob. Disconnect the 12 volt battery for about 15 minutes by taking off the negative cable first then the positive cable. Then, reconnect the battery. This will clear out any remaining electricity and restart the car's computers, which can help you get your key fob working again. If the problem persists you should seek the advice of an expert technician. They can identify the exact cause of issues.