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Reasons Your Fiat 500 Key Fob Won't Work A key fob from Fiat 500 makes it simple to open doors and start your car. There are a variety of reasons why the fob may stop working. It could be due to a dead battery, damaged receiver module, water damage issues, and interference. This listing is for a NEW replacement Fiat Flip Key Remote – like the Ilco brand that must be programmed professionally by a local automotive locksmith (click here to search for a Locksmith Search). It comes with lock, unlock and trunk buttons. Dead Coin Battery The most frequent reason that your 500 key fob doesn't function is due to an inactive battery. Modern key fobs offer only a limited range of operation and must be within a few inches of the vehicle to work. If you're not close to your vehicle and you press the key fob button, the car won't be able to 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) by a new one of a reputable brand like 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 standing close to your Fiat 500. The parking lights should flash and the key fob should operate the lock and unlock switches. If the fob's key doesn't work after replacing the battery, it might be damaged by water, which prevents it from connecting to the receiver module in your vehicle. Water damage can occur in a variety of ways, ranging from a light splash to submerging the fob salt water at the beach. If you suspect that your fob has been exposed to water, you can try placing it in a dry rice bag to draw the moisture out. If this doesn't work the fob might require reprogramming by a professional auto locksmith or by the dealer. Water Damage Water damage can happen if you immerse the fob in the ocean, or wash it in a washing machine. Saltwater is particularly dangerous to the fob's circuit board and can cause it to short out and eventually die. In the event that you let your fob get wet, it's not an ideal choice, but if you drop it into an empty cup of water, or don't remember to take it out of your pants pocket before 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. Then check the fob to see if it works. If the key does not function it could need to be programmed again. This is usually done by an auto locksmith or dealer. If your key is a bit older and has not been programmed for your vehicle You will need to replace it completely. A professional automotive locksmith can do this job. The locksmith will need the key cut to match your car's ignition. The locksmith also needs to reprogram your fob into the car's system. This is a fast and affordable process that can be completed the same day. Receiver Module Issues One of the simplest reasons why your 500 key fob might stop functioning is that it's out of range. The remote's range is of 30 feet. So when you're 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 car until it responds. If your fob does not work after you replace the battery inside the coin, which is also called a “button”, “watch” or “button”, it could be a problem with the internal circuit board. In the majority of cases, reprogramming your fob will fix the problem. You can find the steps for most vehicles on YouTube or in the owner's manual. It may be necessary to replace the clips made of metal that hold the coin batteries in their place. If they lose tension, it could hinder the coin battery from being properly seated and could cause the remote to malfunction. In rare cases the fob may be out of the vehicle's sync because of software or hardware problems. fiat car key replacement can cause a major headache, but you can usually fix it by visiting a local dealer or auto locksmith to reprogram your fob for you. In some instances they might need to reinstall the program in your body control module too. Interference In addition to a dead coin battery The key fob may not be able to receive or transmit signals due to interference. This could happen if the key fob is close to an electronic radio transmitter (cell phones or radar detectors) or another source of electromagnetic radiation. The key fob may not function due to a poor connection with the buttons water damage or damage to the internal chips. If the key fob has stopped working one day without notice or after trying everything you can at home to fix it e.g. You might have a damaged 500 receiver module after you've tried replacing the battery, reprogramming, and using an alternative key fob. The receiver module, located beneath the dashboard, receives radio frequency signals from your key fob. It converts the signals into electronic commands that are then translated by the vehicle. Luckily, there is an easy method to reset every single system on board in your 500 keys, including the key fob. Disconnect the battery of 12 volts for approximately 15 minutes by taking off the negative cable first then the positive cable. Reconnect the battery. This will clear out any remaining electricity and restart the car's computer system, which could help get your key fob working again. If the problem persists you should seek out an expert technician. They'll be able determine the root of your issue.