Reasons Your Fiat 500 Key Fob Won't Work
A fiat 500 key fob is a convenient method to open the doors and begin the car. There are many reasons the fob could 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 the most common cause of your 500 key fob not functioning. Modern key fobs have a very restricted operating range, and should be within just a few feet of the vehicle to operate. 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 occurs If this happens, replace the battery in the coin-cell (Part Number CR2032) by a fresh one of a reputable brand such as Panasonic Duracell or Energizer. They are available at your local hardware store, or online.
After you've changed the battery on the coin cell you can test it by standing close to your Fiat 500 and pressing the buttons. The parking lights will flash and the key fob will operate the lock and unlock switches.
If your key fob isn't working even after replacing the battery, it might be water damage that prevents it from connecting to the module inside your vehicle. Water damage can happen in a variety of ways, such as a simple splash or submerging your key fob in saltwater at the beach. If you think your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this fails, you'll require your fob to be changed by an auto locksmith or dealer.
Water Damage
The fob does have rubber seals that keep water out of the chip's electronic circuit the device, submerging it into the ocean or washing it in a machine could cause water damage. Saltwater is especially dangerous to the circuit board of the fob which causes it to short out and eventually end up dying. It's not a good idea to get the fob wet but don't give up even if you accidentally drop the fob in water or forget to take it out of your pocket.
First remove the battery from the fob. Clean the electronic chip using isopropyl alcohol or a similar product and then dry it completely before replacing the battery. Next try the fob and see if it works. If the key still doesn't work, it may need to be reprogrammed. This is usually done by a professional or dealer auto locksmith.
If your key is a bit older and not programmed for your vehicle, you will need to replace it completely. A professional automotive locksmith can complete this simple process. The locksmith will require the key cut to match your vehicle's ignition. They will also need to reprogram the fob to the car's system. This is an affordable and quick process that can be completed in the same day.
Receiver Module Issues
The 500 key fob could stop working because it is out of range. The remote has a maximum range of 30 feet. So if you are too far from your car it won't respond to your commands. This can be fixed by moving closer to your vehicle until it starts responding.
If your fob isn't working after you replace the coin battery, also known as a "button", "watch" or "button", it may be due to a malfunction on the internal circuit board. In most cases, reprogramming the fob can resolve the issue. There are instructions on how to do this on the majority of automobiles by searching YouTube or consulting the owner's manual.
You may have to replace the metal clips that hold the battery of your coin in place. If they lose tension it could prevent the coin battery from being properly seated and cause your remote to malfunction.
In rare instances, the fob can become out of sync with your vehicle because of hardware or software problems. You can fix this problem by visiting your local dealer or auto-locksmith to reprogram your key fob. In some cases it is possible that the software will require reinstallation in your body control modules.
Interference
In addition to a dead battery on a coin, the key fob may not be able to receive or transmit the signal due to interference. This can occur when the keyfob's location is in close proximity to a radio transmitter, such as a cell phone or radar detector. The key fob may not function due to a bad connection to the buttons or water damage, or damage to the internal chips.
If the key fob failed to work one day without notice or even after trying every option at home to solve it e.g. replacing the battery, reprogramming, and using the spare key fob, you may have a damaged receiver module on your 500. The receiver module, located under the dashboard, detects radio frequency signals from your key fob. It transforms the signals into electronic commands, which are then processed by the vehicle.
There is a simple way to reset the 500's on-board system including the keyfob. Disconnect the battery for 15 minutes by removing first the negative cable, then the positive cable. Reconnect the battery. This will clear any residual electric current, and also restart the computer in your car. This can help you get your key fob to function again. If the issue persists, you should seek out an expert technician. They can identify the root cause of your problem.