Reasons Your Fiat 500 Key Fob Won’t Work
A key fob for the Fiat 500 allows you to easily open doors and start your car. There are a variety of reasons why the key fob might stop working. It could be due to a dead battery damage to the receiver module, water problems, and interference.
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Dead Coin Battery
The most frequent reason that the 500 key fob won’t work is an inactive battery. Modern key fobs operate with a limited range of operation, and must be within just a few feet of the vehicle to operate. If you’re far away from your vehicle and press the key fob button, the car will not respond, and will display the “Key Fob Not Detected” message in the instrument cluster.
If this happens you need to replace the battery of your coin-cell (Part Number CR2032) with a new battery from a reputable brand fiat Ducato key fob programming such as Panasonic Duracell or Energizer. You can usually find them at 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 500. The car will blink its parking lights and the key fob should operate the lock and unlock buttons.
If your key fob still isn’t working even after replacing the battery, it may be water damage which is preventing it from communicating with the module inside your vehicle. Water damage can happen in a number of ways, from small splashes to submerging the fob in salt water at the beach. If you suspect that your fob has been exposed to water, try placing it in a dry rice bag to draw the moisture back out. If this does not work, you’ll have to get your fob replaced by an auto locksmith or dealer.
Water Damage
The fob does have rubber seals to keep water out of the chip’s electronic circuit and out of the ocean or washing it in a machine can cause water damage. Saltwater can cause the circuit board to short, and eventually die. The fob getting wet is not an ideal choice, but if you drop it into an empty cup of water, or fail to take it out of your pants pocket before running the washer, don’t give up hope.
Take the battery off first. Before replacing the battery clean the electronic chip using isopropyl or similar products. Check the fob to check if it’s working. If the key doesn’t function, it may need to be changed. This is usually done by an auto locksmith or dealer.
If your key is older and is not programmed for your car then you’ll need to replace it completely. A professional automotive locksmith can do this job. The locksmith will have to cut the key to match the ignition on your vehicle. They’ll also need to program the fob into the system of your car. This is an affordable and quick process that could be completed in the same day.
Receiver Module Issues
One of the most common reasons your 500 key fob won’t be working is because it’s out of range. The remote usually has a range of 30 feet or less, and if it’s too far away from your car it will not respond to your commands. This can be fixed by moving it closer to your vehicle until it starts responding.
If you’ve replaced the battery in your coin (commonly called”button” or “button” or “watch”) and the fob isn’t working, it could have an internal circuit board issue. Reprogramming your fob can resolve the issue. You can find instructions on how to do this for most vehicles by searching YouTube or looking through the owner’s manual.
You may have to replace the metal clips that keep the coin battery in place. If they loose tension it could hinder the coin battery from being properly seated and could cause your remote to malfunction.
In rare instances, the fob can become out of the vehicle’s sync because due to hardware or software issues. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain situations they might need to reinstall the program in your body control module, as well.
Interference
In addition to a dead battery on a coin, the key fob may not be receiving or transmitting the signal due to interference. This could happen when the keyfob is in close proximity to a radio transmitter like a cell phone or radar detector. Other reasons the key fob could not function include a poor connection to the buttons or the internal chip, or water damage.
If the key fob stopped working one day suddenly or even after trying everything you can at home to fix it e.g. replacing batteries, reprogramming or using the spare key fob, you may have a defective 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. Then, it converts them into electronic commands that the vehicle interprets.
Fortunately, there’s an easy way to reset all of the on-board systems in your 500 and include the key fob. Disconnect the battery 12 volt for about 15 minutes, by removing the negative cable first then the positive cable. Reconnect the battery. This will erase any remaining electricity, and allow you to restart the computer in your car. This can help get your key fob to function again. If the issue continues, you should seek the advice of an expert technician. They will be able to determine the root of your problem.