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Reasons Your Fiat 500 Key Fob Won't Work
A Fiat 500 key fob makes it simple to open doors and start your vehicle. There are many reasons why the key fob might stop working. This could be due to a dead coin battery, damage to the receiver module, issues, and interference.
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Dead Coin Battery
The most frequent reason that your 500 key fob won't function is an inactive battery. Modern key fobs have a restricted operating range, and should be within only a few feet from the car to operate. If you are far from your car and hit the keyfob, 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 reliable brand, such as Panasonic Duracell or Energizer. They are available at your local hardware store or on the internet.
After you've changed the battery on the coin cell It is possible to test it by standing near your Fiat 500 and pressing the buttons. The car will flash its parking lights, and the key fob should work the lock and unlock switches.
If the key fob doesn't function 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 happen in many ways, such as a simple splash or submerging the key fob in saltwater at the beach. If you suspect that your fob has been exposed to water, put it in a dry rice bag to draw the moisture out. If this doesn't work, you will require your fob to be changed by an auto locksmith or dealer.
Water Damage
Water damage can occur when you immerse the fob into 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. The fob getting wet is not an ideal idea however, if you drop it into a glass of water or do not remember to take it out of your pocket before you run the washer do not give up hope.
First, remove the battery. Clean the electronic chip with isopropyl alcohol or another similar product and dry it completely before replacing the battery. Check the fob again to check if it's functioning. If the key still doesn't work, it might need to be reprogrammed. This is usually handled by an auto locksmith or dealer.
If the key is older and has never been programmed to your vehicle It is likely that it needs to be replaced completely. A professional locksmith in the automotive industry can carry out this simple task. The locksmith will require the key cut to match the car's ignition. The locksmith also needs to reprogram the fob into the car's system. This is a low-cost and quick procedure that can be completed in the same day.
Receiver Module Issues
The 500 key fob could be inoperable because it's out of range. The remote typically has a range of 30 feet or less and if it's far from your car, it won't respond to your commands. It is possible to solve this problem by moving the remote closer to your vehicle until it responds.
If your fob isn't working after you replace the battery inside the coin, which is also called a "button", "watch" or "button" It could be due to an issue with the internal circuit board. Reprogramming the fob is usually the solution to this issue. There are instructions on how to do this for most automobiles by searching YouTube or consulting the owner's manual.
It is possible to replace the metal clips that hold the coin batteries in place. If they lose tension it can prevent the battery from being seated properly and cause your remote to malfunction.
In rare instances the fob might become disconnected from your vehicle due to software issues or hardware issues. This can be a major trouble, but you could usually fix it by visiting an auto locksmith to have them reprogram your fob. In some instances, they may need to install the software again in your body control module as well.
Interference
In addition to a dead battery on a coin the key fob could not be able to receive or transmit an signal due to interference. This could happen when the keyfob is in close proximity to a radio transmitter like a cellphone or radar detector. The key fob could not function because of a problem to the buttons, water damage or damage to the internal chips.

If your key fob suddenly stopped working, or you have tried everything at home to resolve it (e.g. You may have a faulty 500 receiver module after you've tried replacing the battery, reprogramming it, or using an alternative key fob. The receiver module is located under the dash, and it picks up the radio frequency signals from the key fob. The Key Lab converts the signals into electronic commands that are then translated 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, removing first the negative cable, then the positive cable. Reconnect the battery. This will clear any residual electric current, and also restart the computer of your car. This can help you get your key fob to function again. If the issue continues, you should consult an expert technician. They will be able to determine the root of your issue.