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Citroen C3 Key Fob Replacement If your C3's key fob stops functioning suddenly, it could be due to a defective receiver module. If the key fob's function is functioning, the issue could be caused by something else, like water damage or a dead battery for the coin. The eC3 is targeting the mass market, and Citroen has worked on making service easy for customers. It has a range of features including virtual remote diagnosis as well as an app specifically for customer service. Dead coin battery If the unlock button on the key fob does't work, it could be that the battery in the coin is damaged. The battery should last between three and four years with regular usage but it is possible to die unexpectedly. Fortunately, car manufacturers include fail-safes in their products so that you can lock and start your vehicle even if your key fob is dead battery. The battery in the key fob is typically secured by metal clips for retaining that complete the circuit. If these are worn or dirty, the battery will not receive electricity. The battery should be the correct size and type. If the battery is not big enough or large, it will not fit on the fob and will not perform as expected. Key fob batteries are sold under a variety of names like CR2016 or CR2032. g28carkeys.co.uk cannot be interchanged. The best way to know which one to buy is to consult your owner's manual, or look at the fob to find a sticker with a label that contains the specific details. When you have the proper battery, you can swap it within a couple of minutes. Most fobs come with a slider, switch, or gap that you can use to pop open the cover to swap out the old one for the new one. Be sure that the new battery has the same voltage as your old one and that it is inserted correctly. Water damage Water can be harmful to electronics, even if they have survived a wash cycle or a dip. It can harm the chip and destroy the battery. Fortunately, there are a few ways to limit the damage. It is crucial to take the battery off and dry out the inside and circuit board as much as possible. You can also employ a cotton swab dipped in 90-percent isopropyl alcohol to clean the battery as well as the circuit board. After you have cleaned the key fob, it is recommended to dry it for a few days. You can speed this process up by placing it high on a shelf to ensure it isn't disturbed. When you're certain that it's bone dry, try putting in a brand new battery and running it in the same way as you normally would. If your key fob still not working, it could be that the receiver module inside your car is malfunctioning and is unable to transmit signals. It can be costly to fix, but it's definitely worth trying to avoid having to buy a new one. The most straightforward way to fix a broken key fob is to change the battery. Changing the battery should restore the radio signal and make the key fob to work as it should. If the problem continues, you should seek help from a professional. A malfunctioning receiver module In certain cases, a defect in the receiver module of the key fob might cause it to stop receiving or transmitting the right signals. If this is the case, your car won't recognize your remote control key and will not be able to unlock or start the engine. In this case you'll need an alternative. Consult your owner's guide before attempting to modify the key fob by yourself. Ensure that the battery of the key fob is in good health and that all buttons work. Close the doors and remove any other devices from the aftermarket, such as alarms or radios out of the vehicle. You could also try cleaning the chip using isopropyl alcohol or electronic cleaner. If the chip is fried it is likely to need to be replaced. After you've cleaned your key fob, remove the circuit board. Then apply alcohol swabs clean the contacts and let them dry in the air. Once the contacts are dry, you can reassemble the key fob and test it. If it doesn't work it may be necessary to replace the battery. Make sure you choose the latest battery that has the same voltage as the old one. Double-check the battery's placement, since the contact points are very sensitive. Faulty keyless entry systems The key fob is an excellent convenience for cars, but it can be frustrating when it stops working. The good news is that, most of the time, it's easy to get it working again. A dead coin battery is the most frequent reason for a malfunctioning fob. This can be easily replaced in a matter of minutes. Other reasons include signal interference or a defective module, as well as other electrical issues. The first step is to make sure that the battery is correctly fitted and has the correct voltage. The correct type of battery is also essential. Using an incorrectly sized or polarized batteries could harm the internal circuitry. It is also advisable to check the fuses to ensure they aren't blown out or have not been melted. The transponder within the key could be damaged or not functioning properly. This issue will require further diagnostics by a dealer in the car or a professional mechanic. A lot of auto locksmiths and dealerships can reprogram the fob of your car's keys for a fee, however it can be costly. If you have an extra, it could be worth attempting to reprogram the fob yourself. In most cases, it is possible to get instructions from your owner's guide. If you don't have the manual, you can find instructions on the internet or on YouTube. It is imperative to check the owner's manual prior attempting any repairs to the key fob.