Reasons Your Fiat 500 Key Fob Won't Work

A key fob with the fiat 500 number is a convenient method to unlock the doors and get started the car. However, there are numerous reasons why the fob may stop functioning. This includes a dead coin-battery and water damage, as well as problems with the receiver modules, and interference.

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Dead Coin Battery

A dead battery is the most frequent reason for your 500 key fob not working. Modern key fobs have a limited operating range and should be within some feet of the car to operate. If you're far from your car and push the keyfob button it will not respond and display the message "Key Fob Not Detected".

If this happens you need to replace the battery of your coin-cell (Part Number CR2032) with a new battery of a trusted brand like Panasonic Duracell or Energizer. You can usually find them in your local hardware store or on the internet.

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

If the key fob doesn't work after replacing the battery, it may be damaged by water that blocks it from connecting to the receiver module in your car. Water damage can occur in a number of ways, ranging from the slightest splash to submerging the fob in salt water at the beach. If you suspect your fob has been exposed to water, you can try placing it in a dry rice bag to pull the moisture out. If this does not work, you'll need to have the fob replaced by an auto locksmith or dealer.

Water Damage

Damage to the water supply can occur if you immerse the fob in the ocean or wash it in a washing machine. Saltwater is especially dangerous to the circuit board of the fob that can cause it to short out and eventually die. If you get the fob wet, it's not a good idea but if you drop it into the water in a cup or don't remember to take it out of your pocket before you run the washing machine, don't give up hope.

First take the battery off the fob. Clean the electronic chip with isopropyl alcohol or a similar product and dry it thoroughly before replacing the battery. Check the fob to verify if it's working. If the fob doesn't work, it may have to be reprogrammed. This is typically handled by a professional or dealer auto locksmith.

If the key is a newer model and has never been programmed to your vehicle It will most likely need to be replaced completely. This is a simple process that can be carried out by a professional automotive locksmith. The locksmith will need the key to be cut to match your vehicle's ignition. They'll also have to reprogram the fob to your vehicle's system. This is a simple and cost-effective process that is usually completed the same day.

Receiver Module Issues

One of the most common reasons your 500 key fob may stop working is because it's out of range. The remote's range is of 30 feet, so if you are too far away from your vehicle, it won't respond to your commands. It can be solved by moving closer to your vehicle until it begins responding.

If you've replaced the battery on your coin (commonly called a "button" or "watch") and your fob doesn't function it could be due to an internal circuit board issue. Reprogramming your fob can resolve this issue. You can find the instructions for most vehicles on YouTube or in the owner's guide.

It is possible to replace the metal clips that hold the coin batteries in place. If they become loose, it may prevent your battery from being properly seated, causing your remote to malfunction.

In rare instances, the fob might be out of connection with your vehicle as a result of hardware or software problems. This can be a major issue, but you are able to usually fix it by visiting an auto locksmith to have them reprogram your fob. In certain instances it is possible that the software will require reinstallation to your body control modules.

Interference

Interference can also cause the key fob to not be able to receive or transmit an signal. This can happen when the key fob is near an electronic radio transmitter (cell phones or radar detectors) or any other source of electromagnetic radiation. The key fob may not work because of a weak connection to the buttons water damage or damage to the internal chips.

If your key fob suddenly stopped working, or if you have tried everything at home to resolve it (e.g. battery replacement, reprogramming and using the spare key fob, you could have a defective receiver module on your 500. The receiver module, located under the dashboard, is able to pick up radio frequency signals from your key fob. It converts them into electronic commands that the vehicle interprets.

There is a simple way to reset the 500's in-board system, including the keyfob. Disconnect the battery of 12 volts for about 15 minutes by disconnecting the negative cable first then the positive cable. Then, reconnect the battery. This will eliminate any remaining electrical charge and restart the car's computers, which can help get your key fob working again. If the issue persists, you should seek the advice of an expert technician. They will be able diagnose the root cause of any issues.