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Reasons Your Fiat 500 Key Fob Won't Work

A key fob for the Fiat 500 is a convenient method to unlock the doors and start the car. There are a variety of reasons why the fob may stop working. This includes a dead coin-battery water damage, issues with the receiver module, and interference.

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Dead Coin Battery

A dead battery is probably the most common reason for your 500 key fob not functioning. Modern key fobs only have limited operating range and must be within a few inches of the vehicle in order to work. If you are far from your vehicle when you press the key fob button, the car won't respond and will display a "Key Fob Not Detected" message in the instrument cluster.

If this happens, replace the battery of your coin cell (Part number CR2032) with a new one from a reputable brand like Panasonic, Duracell, or Energizer. They can be found in your local hardware store or on the internet.

You can test the battery of your coin-cell by pressing the buttons while standing near your Fiat 500. The parking lights should light up and the key fob should operate the lock and unlock switches.

If the fob's remote doesn't work after replacing the battery, it could be damaged by water, which prevents it from connecting to the receiver module in your car. Water damage can happen in a variety of ways, ranging from an accidental splash to submerging the fob in salt water at the beach. If you believe your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this does not work, you'll need to have your fob replaced by an auto locksmith or dealer.

Water Damage

While the fob has some rubber seals that keep water out of the electronic chip inside and out of the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to become shorted and eventually cease to function. It's not good to get the fob wet however, but don't give it up in the event that you accidentally drop it in water, or fail to remove it from your pants pocket.

First take the battery off the fob. Before replacing the battery, clean the electronic chip using isopropyl, or a similar product. Next test the fob to verify if it is working. If the fob doesn't work, it might need to be programmed again. This is usually handled by an auto locksmith or dealer.

If your key is a bit older and not programmed for your car it is necessary to replace it completely. This is a simple procedure which can be accomplished by a professional locksmith for automotive use. The locksmith will have to cut the key to match the ignition on your vehicle. They will also need to program the fob into the car's system. This is an affordable and fast process that can be completed within the same day.

Receiver Module Issues

Your 500 key fob might stop working because it is out of range. The remote has a range of 30 feet, so if you are too far from your vehicle it will not respond to your commands. It is possible to remedy this by moving your remote closer to your car until it responds.

If your fob won't work after replacing the battery inside the coin, which is also known as a "button", "watch" or "button" it could be a problem with the circuit board inside. Reprogramming the fob typically resolves this problem. You can find directions on how to do this for all vehicles by searching YouTube or consulting the owner's manual.

You may need to replace the metal clips that hold the coin battery. If they become loose, it can stop your coin battery from being properly seated, causing your remote to malfunction.

In rare cases the fob might become desync'd with your vehicle due to software problems or hardware issues. You can fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain instances, they may need to reinstall the software in your body control module too.

Interference

In addition to a dead battery on a coin, the key fob may not be receiving or transmitting signals due to interference. This may happen if the key fob is in close proximity to a radio transmitter, such as a cell phone or radar detector. The key fob could not function due to a bad connection to the buttons water damage or damage to the internal chips.

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If the key fob stopped working one day out of the blue, or after trying everything you can do at home to resolve it e.g. You may have a faulty 500 receiver module if you've tried replacing the battery, reprogramming, and using an alternative key fob. The receiver module 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 translated by the vehicle.

Fortunately, there's an easy method to reset all on-board systems in your 500, including the key fob. Disconnect the battery 12 volt for approximately 15 minutes by taking off the negative cable first then the positive cable. Reconnect the battery. This will get rid of any remaining electricity and then restart the car's computers, which could help get your key fob working again. If the problem persists you should seek out an expert technician. They can identify the root of any issues.