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If your 500 key fob fails to function Try a different one to see if the car will recognize it. If it does, the problem is likely to be related to the original fob's battery or water damage.
Replace the battery first. The "+" side should be facing downwards.
Dead Battery
The majority of the time, when a fob isn't working it's just because the battery is dead. It's easy to fix and the majority of fobs will notify you that the battery is not fully charged. You can find the instructions for most car fobs YouTube or in the owner's manual. You can also change it by taking it to a locksmith or dealer who sold it to you.
Sometimes a fob stops working due to a glitch on the internal circuit board. It's not common, but it does happen. If you dropped the fob on something sharp, it can damage the internal chip. This could also happen if you use an aftermarket key and the fob won't function. In this instance you'll be required to go to an expert locksmith or dealer and have it reprogRammed to work with your 500.
One 2012 FIAT 500 Flip Key Remote - Look-alike Ilco brand with trunk, lock and lock buttons - new replacement keyless entry remote (will need to be cut and programmed by locksmith)
Damaged Chip
Fiat 500 key fobs are wireless devices that transmit an alert to the car every time you press the button. It has a microchip containing information about the code needed to connect with your car. If the chip is damaged, it will not send the correct code, and the car won't start. It is possible to repair this kind of damage and a locksmith could assist. United Locksmith is capable of providing this service for old models as well, as for newer ones, so don't feel scared to contact them.
You can buy a new fob and have it professionally programmed by locksmiths. This is a lot less expensive than visiting a dealer, and it will work similarly. You will need to provide certain details to the locksmith, like the year your car was manufactured and the model.
Rub the chip with an old dollar bill if you're not certain of what to do. The copper on the bill is abrasive enough get rid of dirt and oxidation but it won't cause any harm to the microchip. If the chip is physically damaged, however, it may not be repairable. This can happen when you drop it or hit it by your vehicle.
Water Damage
Water damage is likely to occur on your key, regardless of whether you dropped them in the water accidentally or left them in the pocket while swimming, or splashed them with water during a rainy afternoon. Even if you only have an ounce of water on the key, it can cause major problems for the electronic components of the key.
The good news is that you can solve this issue by removing the key fob and using an old towel to scrub it of any remaining dirt or water. Once the fob has dried you can then replace the battery and it should begin working properly.
You can also take it to an auto shop or locksmith to have it professionally programmed and cleaned. These professionals can use special equipment to make sure that the key fob is compatible with your car's computers.
If the key fob on your Fiat 500 stops working, you may feel irritated and anxious. It is tempting to go to the dealer to have your key fob replaced however this could be costly and inconvenient. A locksmith can handle every aspect of your car's key fob replacement without the requirement of a dealership trip. Locksmiths are better than a dealer because they can handle every aspect of the replacement of your car's key fob without the requirement for a dealership visit.
Pairing Issues
When you drop your key fob, or it stops working but there's nothing the issue this could be because of the chip that has gone awry. It could be because of water damage or the battery is dead.
In most cases, this can be accomplished by following the directions in your owner's guide. However it's recommended to have an automotive locksmith perform this procedure if you're having difficulties or the steps in the manual don't work for you. This will ensure that the chip isn't damaged and is likely to be the most affordable solution.
A few hundred owners have reported that their keys will not lock their cars. This could be a problem when you need to refill at a gas station. Some owners have even reported their 500's locking mechanism breaking and having to replace the entire steering intermediate shaft. This issue was cited in a technical service bulletin (TSB) by Fiat.
If you're having trouble with your Fiat, an experienced locksmith could help. They'll duplicate the key you have or they can make you an entirely new one that can lock and start the vehicle. They can accomplish this without having to see your old key and are usually less expensive than buying it from a dealer.