Reasons Your Fiat 500 Key Fob Won't Work

A key fob for Fiat 500 allows you to easily open doors and start your car. There are many reasons the key fob might stop working. This includes a dead battery and water damage, as well as issues with the receiver module, and interference.

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Dead Coin Battery

The most common reason your 500 key fob won't work is an inactive battery. Modern key fobs offer an operating range that is limited and must be within just a few inches of the vehicle to function. If you are far from your vehicle, and you press 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) with a new battery of a reputable brand such as Panasonic Duracell or Energizer. You can find them in your local hardware store, or online.

You can test the battery on your coin-cell by pressing the buttons while you're standing close to your Fiat 500. The car should blink its parking lights, and the key fob should be able to operate the lock and unlock buttons.

If the fob's key doesn't function after replacing the battery, it might be damaged by water that blocks it from communicating with the receiver module inside your vehicle. Water damage can happen through a variety of methods, including a simple splash or submerging your key fob in saltwater at the beach. If you suspect that your fob was exposed to water, you can place it in a rice bag to draw out the moisture. If this doesn't work, you will require your fob to be replaced by an auto locksmith or dealer.

Water Damage

Although the fob is equipped with rubber seals to keep water out of the electronic chip inside it, submerging it in the ocean or washing it in a machine could cause water damage. Saltwater can cause the circuit board to short, and eventually cease to function. It's not a good idea to get the fob wet, but don't give it up even if you accidentally drop the fob in water or forget to remove it from your pants pocket.

First, remove the battery. Clean the electronic chip with isopropyl alcohol or another similar product and dry it completely before replacing the battery. Next check the fob to verify if it is working. If the fob doesn't work, it may need to be programmed again. This is usually handled by a professional or dealer auto locksmith.

If the key you have is older and is not programmed for your car, you will need to replace it completely. A professional locksmith for cars can complete this simple process. The locksmith will require the key to be cut to match the car's ignition. They'll also have to reprogram the fob in the system of your car. This is an affordable and fast process that can be completed on the same day.

Receiver Module Issues

The 500 key fob you have may not function because it's out of range. The remote usually has a range of 30 feet or less and if it's far away from your car it will not respond to your commands. You can easily solve this problem by moving the remote closer to your vehicle until it responds.

If your fob does not work after replacing the battery inside the coin, which is also known as a "button", "watch" or "button", it could be due to an issue with the internal circuit board. In the majority of cases, reprogramming your fob can resolve the problem. You can find directions on how to do this for the majority of automobiles by searching YouTube or consulting the owner's manual.

It could be necessary to replace the metal clips that hold the coin batteries in the correct position. If they lose tension, it can prevent the battery from sitting properly and could cause your remote to malfunction.

In rare instances it is possible that the fob will become disconnected from your vehicle due to software problems or hardware issues. You can fix this problem by visiting your local auto-locksmith or dealer to reprogram your key fob. In certain situations they might need to reinstall the software in your body control module, as well.

Interference

Interference can also cause the key fob not to receive or transmit a signal. This may happen if the keyfob is located in close proximity to a radio transmitter like a cell phone or radar detector. The key fob might not function because of a weak connection with the buttons or water damage, or damage to the internal chips.

If the key fob has suddenly stopped working, without notice or even after trying everything you can do at home to fix it e.g. battery replacement, reprogramming and using the spare key fob, you may have a malfunctioning receiver module on your 500. The receiver module is located 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 processed by the vehicle.

Luckily, there is an easy method to reset all on-board systems in your 500 keys, including the key fob. Disconnect the battery for 15 minutes, removing first the negative cable, then the positive cable. Then, reconnect the battery. This will remove any remaining electrical charge, and then restart the computer in your car. This will help you get your key fob to work again. If the problem persists it is recommended that you consult an expert technician. They can identify the root cause of any issues.