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Citroen C3 Key Fob Replacement If your C3's key fob stopped completely it could be due to a malfunctioning receiver module. If the key fob is working it could be because of other issues, such as water damage or a dead battery. The eC3 is aimed at the mass market, so Citroen has worked on making the service accessible to customers. It offers several features including virtual remote diagnosis and a dedicated app for customer service. Dead coin battery If the unlock button on the key fob doesn't work, it could be that the battery in the coin is not working properly. Battery life should range between three and four year with regular use. However, it could suddenly stop working. The automakers have created fail-safes that permit you to lock and start the vehicle even if the key fob is dead. The battery inside the key fob is normally held in place by metal clips for retaining that complete the circuit. If they are worn out or dirty, the battery might not be able to receive electricity. The battery must be the right size and type. If The Key Lab is too small or large, it will not fit on the fob and won't function properly. Key fob batteries are typically sold under different names, such as CR2016 and CR2032 (though they aren't interchangeable). Read the owner's guide for your particular model or look for a sticker on the fob which contains the information. When you've got the proper battery and it's replaced, it's possible to replace it in just a few moments. Most fobs come with the option of a slider, switch, or a gap that can be used to open the cover off and replace the battery that was used. Make sure that the new battery is the same size and voltage, and is inserted in the correct orientation. Water damage Even even if your key-fob has survived the wash cycle or a dip in the pool, water is not ideal for electronics. It can damage the chip and damage the battery. Fortunately, there are actions you can take to limit the damage. First, it's important to remove the battery and dry out the interior and circuit board as much as is possible. You can also clean the battery by using a cotton swab which is dipped in 90 percent alcohol. After you have cleaned the key fob, you should let it dry for a few days. You can speed it up by placing it high on a shelf so it will not be disturbed. After you've confirmed that it's bone dry try replacing the battery and use it as usual. If the key fob still isn't working, it could have a defective receiver module that's not able to send signals to your car. It can be expensive to fix, but is worth it if you don't need to replace your vehicle. The easiest way to fix a broken key fob is to replace the battery. The battery change will restore the radio signal and make the key fob function again. If the problem continues, you should seek professional assistance. Faulty receiver module In some cases there may be a problem with the receiver module of the key fob may prevent it from receiving or transmitting the right signals. In this case, the car will not recognize the remote control key. It won't unlock or start. In this case the replacement remote control will be required. The steps for reprogramming the key fob are different for each make and model So, make sure to consult the owner's manual prior to trying to do it yourself. First, make sure that the battery of the key fob is in good working order and that all of its buttons are working. Also, close the doors and remove any other aftermarket devices, such as alarm systems or radios from the vehicle. You can also try cleaning the chip with isopropyl alcohol or electronic cleaner. If the chip has become fried, you will have to replace it. After you've cleaned the key fob, take it off its circuit board. Then, clean the contacts with alcohol swabs. Let them dry. After the contacts have dried, you can put them back together and test the key fob. If it doesn't work you might need to replace the battery. Use a battery that has the same voltage as the battery you replaced. Check the battery's location, because the contact points are extremely sensitive. Keyless entry system malfunctions The key fob is an excellent convenience in vehicles however it can be frustrating when it ceases to function. The good news is that most times it's simple to get it back in operation. The most common cause of a malfunctioning key fob is a dead battery for the coin that can be replaced in minutes. Other causes include signal interference, a bad receiver module or other electrical issues. The first step is to ensure that the battery is of the right voltage and is properly inserted. It is also important to use the correct type. The internal circuitry of the device could be damaged by using the wrong battery, or one that isn't the proper size or the correct polarized. Also, you should check the fuses to make sure they're not blowing or have not melted. A transponder that is inside the key could be damaged or absent. This issue will require further diagnostics by a car dealer or a professional mechanic. Many auto locksmiths and dealerships can reprogram the fob of your car's keys for a fee, but this can be expensive. If you have an extra key, it may be worthwhile to try reprogramming the fob yourself. It is possible to find instructions in the owner's manual. If you don't have the manual, you can find the instructions online or on YouTube. It is important to consult the owner's manual prior attempting any repairs on the key fob.