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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 is a convenient method to open the doors and start the car. However, there are many reasons the fob could stop working. This includes a dead battery and water damage, as well as receiver modules issues, and interference. This listing is for an NEW replacement Fiat Flip Key Remote – similar to the Ilco brand that needs to be programmed professionally by a local locksmith (click here to search for a Locksmith Search). Includes lock, unlock, and trunk buttons. Dead Coin Battery The most common reason your 500 key fob won't function is the battery is dead. Modern key fobs come with a limited operating range and should be within a few feet of the vehicle in order to function. If you are further away from your vehicle and hit the keyfob, it won't respond and display the message “Key Fob Not Detected”. If this happens, replace the battery in the coin cell (Part number CR2032) by a new one from a trusted brand like Panasonic, Duracell, or Energizer. You can find them in your local hardware store, or online. You can test the battery of your coin-cell by pressing the buttons while you are standing close to your Fiat 500. The parking lights should light up and the key fob will operate the lock and unlock switches. If the fob's key doesn't work after replacing the battery, it may have water damage that stops it from connecting to the receiver module inside your vehicle. Water damage can occur in many ways, such as the simple splash or submerging your key fob in saltwater at the beach. If you believe your fob was exposed to water, put it in a bag of rice to draw out the moisture. If this doesn't work, you will require your fob to be replaced by an auto locksmith or a dealer. Water Damage Water damage can happen if 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 end up dying. In the event that you let your fob get wet, it's not a good idea however, 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 washing machine and you don't have a chance, don't give in. Take the battery off first. Clean the electronic chip using isopropyl alcohol or another similar product and then dry it thoroughly before replacing the battery. Then check the fob to test if it works. If the key doesn't function it could need to be reset. This is usually handled by an auto locksmith or dealer. If your key is older and has not been programmed to work with your vehicle it is necessary to replace it completely. A professional locksmith for automotive can complete this simple process. The locksmith will require the key cut to match the car's ignition. They will also need to program the fob into the system of your car. This is a fast and inexpensive process which can be completed in the same day. Receiver Module Issues The 500 key fob you have may stop working because it is out of range. The remote usually has an operating range of 30 feet or less and if it's far away from your car it will not respond to your commands. It can be solved by moving it closer to your vehicle until it starts responding. If your fob isn't working after replacing the battery in the coin, also called a “button”, “watch” or “button” it could be due to an issue with the circuit board inside. Reprogramming the fob usually resolves the issue. You can find instructions on how to do this for all vehicles by searching YouTube or looking through the owner's manual. It could be necessary to replace the metal clips that hold the coin batteries in their place. If they lose tension, they could stop the coin battery from being properly seated and could cause your remote to malfunction. In rare instances it is possible that the fob will become disconnected from your vehicle because of software or hardware issues. You can fix this problem by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain instances, the software may also need to be reinstalled in your body control modules. Interference In addition to a dead coin battery The key fob may not be able to transmit or receive signals due to interference. This could occur if the key fob is near the radio transmitter (cell phones, radar detectors) or any other source of electromagnetic radiation. Other reasons why the key fob may not function include a weak connection to the buttons, damage to the internal chip or water damage. If your key fob suddenly stopped working, or you've tried everything at home to fix it (e.g. You could have a malfunctioning 500 receiver module if you've tried replacing the battery, reprogramming, or using a spare key fob. The receiver module is located under the dash and receives the radio frequency signals from the key fob. It transforms the signals into electronic commands, which are then interpreted by the vehicle. There's a simple method to reset the 500's in-board system including the keyfob. Disconnect the battery of 12 volts for approximately 15 minutes by disconnecting the negative cable first then the positive cable. Then reconnect key fiat 500 . This will clear any residual electricity, and restart the computer in your car. This can help get your key fob to function again. If the issue continues, you should consult a certified technician. They will be able to determine the root of your problems.