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Reasons Your Fiat 500 Key Fob Won't Work

A key fob for the Fiat Key Programmer 500 is a convenient way to unlock the doors and start the car. However, there are many reasons the fob could stop functioning. This includes a dead coin-battery water damage, receiver modules issues, and interference.

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Dead Coin Battery

A dead battery is the main reason for your 500 key fob being inoperative. Modern key fobs only have only a limited range of operation and must be within only a few inches from the vehicle in order to work. If you're far from your vehicle, and you push the keyfob button it won't respond and display the message "Key Fob Not Detected".

If this happens, simply replace the battery on your coin cell (Part number CR2032) with a fresh one from a reputable brand such as Panasonic, Duracell, or Energizer. You can find them at the local hardware store or online.

You can test the coin-cell battery by pressing the buttons while you're standing close to your Fiat 500. The parking lights should flash and the key fob should operate the lock and unlock switches.

If your key fob still does not work after replacing the battery, it might be water damage that hinders it from communicating with the module in your vehicle. Water damage can happen in a variety of ways, from an accidental splash to submerging the fob into salt water at the beach. If you suspect your fob was exposed to water, put it in a dry rice bag to draw the moisture back out. If this doesn't work, your fob may need to be reset by a professional locksmith or dealer.

Water Damage

Water damage can occur when you submerge the fob in the ocean, or wash it in a machine. Saltwater can cause the circuit board to short and eventually fail. The fob getting wet is not an ideal idea but if you drop it into an empty cup of water, or don't remember to take it out of your pants pocket prior to running the washer do not give up hope.

First remove the battery from the fob. Before replacing the battery clean the electronic chip with isopropyl, or a similar product. Test the fob afterward to see if it is functioning. If the fob doesn't work, it might need to be reset. This is usually done by an auto locksmith or dealer.

If the key is older and was not programmed to your vehicle it is likely to need to be replaced completely. This is a straightforward process which can be accomplished by a professional automotive locksmith. The locksmith needs to cut the key to match the ignition of your car. The locksmith will also need to reprogram the fob into the car's system. This is a low-cost and quick process that could be completed in the same day.

Receiver Module Issues

The 500 key fob could be inoperable because it's out of range. The remote has a range of 30 feet, so should you be too far away from your vehicle it won't be able to respond to your commands. It is possible to remedy this by moving your remote closer to your vehicle until it responds.

If you've replaced your coin battery (commonly known as a "button" or "watch") and the fob isn't working it could be due to an internal circuit board problem. In the majority of cases, reprogramming your fob will fix the issue. You can find the instructions on how to do this for most vehicles by searching YouTube or checking out the owner's manual.

It is sometimes necessary to replace the metal clips that hold the coin batteries in place. If they loose tension, it could prevent the coin battery from sitting properly and could cause your remote to malfunction.

In rare cases the fob might become disconnected from your vehicle due to software or hardware issues. It is possible to fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In some cases it may be necessary to reinstall the software on your body control module, as well.

Interference

Interference can also cause the key fob to be unable to receive or transmit a signal. This is possible when the key fob is close to radio transmitters (cell phones or radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob may not function include a poor connection to the buttons or damage to the internal chip or water damage.

If your key fob suddenly stopped working, or if you have tried everything at home to solve the issue (e.g. battery replacement, reprogramming and using the spare key fob, you might have a faulty receiver module on your 500. The receiver module, which is located beneath the dashboard, receives radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets.

Luckily, there is an easy method to reset all on-board systems in your 500 and include the key fob. Disconnect the battery 12 volt for about 15 minutes by disconnecting the negative cable first then the positive cable. Then reconnect the battery. This will clear any residual electrical charge, and then restart the car's computer. This can help you get your key fob to function again. If the problem persists you should seek out an expert certified technician. They can identify the root cause of your issues.