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 the fob could stop working. It could be due to a dead battery or water damage, receiver module issues, or interference.

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Dead Coin Battery

A dead battery is the most common reason for your 500 key fob not functioning. Modern key fobs only have only a limited range of operation and must be within a few inches of your vehicle in order to work. If you are further away from your vehicle and you hit the keyfob, it will not respond, and display the message "Key Fob Not Detected".

If this happens then replace the battery for your coin-cell (Part Number CR2032) with a new battery of a reliable brand, like Panasonic Duracell or Energizer. You can find them in your local hardware store or online.

You can test the battery in the coin-cell by pressing the buttons while you're standing close to your fiat ducato key programming 500. The car will flash its parking lights, and the key fob should operate the lock and unlock buttons.

If the fob's remote doesn't function after replacing the battery, it could be damaged by water, which prevents it from connecting to the receiver module inside your vehicle. Water damage can happen in a variety of ways, ranging from the slightest splash to submerging the fob into salt water at the beach. If you suspect your fob has been exposed to water, put it in a dry rice bag to draw the moisture out. If that doesn't work, your fob will probably need to be reset by a professional locksmith or dealer.

Water Damage

Although the fob is equipped with rubber seals that keep water from the chip's electronic circuit the device, submerging it into the ocean or washing it in a machine could cause water damage. Saltwater poses a particular risk to the circuit board of the fob and can cause it to short out and eventually end up dying. It's not the best idea to let the fob get wet however, but don't give it up if you accidentally drop it in the water or don't take it out of your pocket.

First, remove the battery. Clean the electronic chip using isopropyl or a similar product and then dry it thoroughly before replacing the battery. Next test the fob to check if it functions. If the key isn't working, it may need to be changed. This is typically done by a dealer or professional auto locksmith.

If your key is older and not programmed for your car it is necessary to replafob may not work due to a bad connection to the buttons or water damage, or damage to the internal chips.

If your key fob suddenly stopped working, or you have tried everything at home to resolve it (e.g. replacing the battery, reprogramming, and using the spare key fob, you could have a damaged receiver module on your 500. The receiver module, located under the dashboard, is able to pick up radio frequency signals from your key fob. It transforms the signals into electronic commands which are then processed by the vehicle.

There's a quick and easy way to reset the 500's onboard system including the keyfob. Disconnect the 12 volt battery for about 15 minutes, by disconnecting the negative cable first then the positive cable. Reconnect the battery. This will remove any remaining electricity, and allow you to restart the computer in your car. This will help you get your key fob to work again. If the problem persists you should seek out an expert technician. They can identify the root cause of any problems.