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Reasons Your Fiat 500 Key Fob Won't Work A key fob with the fiat 500 number is a great way to unlock the doors and start the car. There are many reasons the key fob might stop working. This includes a dead battery water damage, problems with the receiver modules, and interference. This listing is for an NEW replacement Fiat Flip Key Remote that appears similar to the Ilco brand. It must be professionally programmed (click here to search for local locksmiths for your vehicle). It comes with lock, unlock and trunk buttons. Dead Coin Battery A dead battery is the most common reason for your 500 key fob not working. Modern key fobs operate with a limited operating range and must be within some feet of the car to operate. If you're far from your car and hit the keyfob, it will not respond, and display the message “Key Fob Not Detected”. If this happens, simply replace the battery of your coin cell (Part number CR2032) with a brand new one from a reputable manufacturer like Panasonic, Duracell, or Energizer. They can be found in the local hardware store or on the internet. 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 blink and the key fob will operate the lock and unlock switch. If your fob's key isn't working even after replacing the battery, it could be water damage that has prevented it from communicating with the module in your vehicle. Water damage can happen in many ways, including the simple splash or submerging the key fob into saltwater at the beach. If you suspect that your fob has been exposed to water, you can place it in a rice bag to draw out the moisture. If this fails, you'll require your fob to be changed by an auto locksmith or a dealer. Water Damage Water damage can occur if you submerge the fob in the ocean or wash it in a washing machine. Saltwater is particularly dangerous to the circuit board of the fob that can cause it to short out and eventually die. It's not good to get the fob wet however, don't give it up in the event that you accidentally drop it in the water or don't remove it from your pants pocket. Remove the battery first. Clean the electronic chip with isopropyl or a similar product and dry it thoroughly before replacing the battery. Check the fob again to see if it is functioning. If the fob doesn't work, it may need to be programmed again. This is usually handled by an auto locksmith or dealer. If the key is more recent and was not programmed to your car it is likely to need to be replaced completely. A professional locksmith in the automotive industry will be able to complete this process. The locksmith will require the key to be cut to match the car's ignition. They'll also have to program the fob into the car's system. This is a low-cost and quick process that can be completed the same day. Receiver Module Issues The 500 key fob could not function because it's out of range. The remote typically has an area of 30 feet or less and if it's far from your car, it won't respond to your commands. This can easily be resolved by moving it closer to your vehicle until it begins responding. If your fob won't work after you replace the battery for the coin, also called a “button”, “watch” or “button” It could be a problem with the internal circuit board. Reprogramming the fob usually resolves this issue. You can find the procedure for most vehicles on YouTube or in the owner's manual. It is sometimes necessary to replace the clips made of metal 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 cases the fob can become out of the vehicle's sync because due to hardware or software issues. You can fix this issue by visiting your local dealer or auto-locksmith to reprogram your key fob. In certain situations they might need to reinstall the software in your body control module, too. Interference In addition to a dead battery on a coin The key fob might not be receiving or transmitting a signal due to interference. This could occur if the keyfob is located in close proximity to a radio transmitter, such as a cell phone or radar detector. Other reasons why the key fob might not function include a weak connection to the buttons, damage to the internal chip or water damage. If the key fob has suddenly stopped working, in the middle of the night and you've tried every option at home to resolve it e.g. battery replacement, reprogramming and using the spare key fob, it could have a malfunctioning receiver module on your 500. The receiver module is situated under the dash, and it picks up the radio frequency signals from the key fob. It converts the signals into electronic commands which are then interpreted by the vehicle. Luckily, there is an easy way to reset all of the on-board systems in your 500 keys, including the key fob. Disconnect the battery 12 volt for about 15 minutes by taking off the negative cable first then the positive cable. Then reconnect the battery. fiat punto remote key replacement will get rid of any residual electricity and restart the car's computers, which can help you the key fob to function again. If the issue continues, you should seek the advice of an expert technician. They can identify the root of any issues.