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Reasons Your Fiat 500 Key Fob Won't Work A fiat 500 key fob is a great way to open the doors and begin the car. There are a myriad of reasons why the fob won't be functioning. This could be due to a dead coin battery, damage to the receiver module, problems, and interference. This listing is for a 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). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is probably the most common reason for your 500 key fob that isn't working. Key fobs of today have limited operating range and must be within a few inches of the vehicle to function. If you're far from your vehicle when you press the key fob button, the car will not respond, and will display an “Key Fob Not Detected” message in the instrument cluster. If this happens, replace the coin cell battery (Part number CR2032) by a new one from a reputable brand like Panasonic, Duracell, or Energizer. They are usually available at your local hardware store, or online. After you've replaced the battery in the coin cell It is possible to test it by standing in front of your Fiat 500 and pressing the buttons. The car should blink its parking lights and the key fob will operate the lock and unlock buttons. If fiat 500 key replacement won't function after replacing the battery, it could be damaged by water, which prevents it from communicating with the receiver module inside your car. Water damage can happen in a number of ways, from small splashes to submerging the fob 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 back out. If that doesn't work, your fob may require reprogramming by a professional locksmith or dealer. Water Damage Water damage can occur if you immerse the fob in the ocean, or wash it in a washer. Saltwater poses a particular risk to the circuit board of the fob that can cause it to short out and eventually die. Getting the fob wet is not an ideal choice, but if you drop it into an empty cup of water, or do not remember to take it out of your pants pocket prior to running the washing machine, don't give up hope. Remove the battery first. Clean the electronic chip with isopropyl alcohol or a similar product and then dry it completely before replacing the battery. Then test the fob to check if it functions. If the fob doesn't work, it might need to be changed. This is typically handled by a professional or dealer auto locksmith. If the key is more recent and hasn't been programmed to your vehicle It will most likely need to be replaced completely. This is an easy process that can be handled by a professional locksmith for automotive use. The locksmith will require the key to be cut to match the car's ignition. The locksmith also needs to reprogram your fob into the car's system. This is a fast and inexpensive process which can be completed in the same day. Receiver Module Issues One of the main reasons your 500 key fob won't be working is that it's simply out of range. The remote has a range of 30 feet. Therefore, should you be too far from your car it will not respond to your commands. This can easily be resolved by moving it closer to your vehicle until it starts responding. If you've replaced the coin battery (commonly called a “button” or “watch”) and the fob won't work it could be due to an internal circuit board problem. Reprogramming the fob typically resolves this issue. You can find the instructions on how to do this for most vehicles by searching YouTube or consulting the owner's manual. It may be necessary to replace the clips made of metal that hold the coin batteries in place. If they lose tension it could hinder the battery from being properly seated, and this will cause your remote to malfunction. In rare instances, the fob might be out of sync with your vehicle because due to hardware or software issues. This could be a huge problem, but you can usually resolve this issue by visiting a local dealer or auto locksmith to reprogram your fob for you. In some cases the software might 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 a signal due to interference. This could happen when the keyfob is in close proximity to a radio transmitter like a cell phone or radar detector. The key fob could not work due to a poor connection to the buttons or water damage, or damage to the internal chips. If your key fob suddenly stopped working, or you have tried everything at home to solve the issue (e.g. You could have a malfunctioning 500 receiver module If you've tried replacing it with a battery, reprogramming, and using an alternative key fob. The receiver module, located under the dashboard, is able to pick up radio frequency signals from your key fob. It transforms the signals into electronic commands that are then processed by the vehicle. Fortunately, there's an easy method of resetting every single system on board in your 500, including the key fob. Disconnect the battery of 12 volts for about 15 minutes, by removing the negative cable and then the positive cable. Then, reconnect the battery. This will get rid of any remaining electricity and then restart the car's computer system, which can help you the key fob to function again. If the issue persists you should speak with an expert certified technician. They will be able to identify the root cause of your issue.