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Citroen C3 Key Fob Replacement If your C3's keypad stopped working all of a sudden it could be due to a malfunctioning receiver module. If the key fob still is working it could be due to something else like water damage or a dead battery. The eC3 is aimed at the mass market, so Citroen has been working to make service easy for customers. It has a range of features including virtual remote diagnosis and a dedicated app for customer service. Dead coin battery If the unlock button on the key fob does't work, it could be that the coin battery is defective. The battery is expected to last between three and four years with regular use but it can fail abruptly. The automakers have created fail-safes that let you unlock and start the vehicle even if your key fob is dead. The battery in the key fob is secured by metal clips that form a circuit. The battery may not be powered if these clips are dirty or worn. The battery must be the correct size and type. The battery will not fit in the fob if it is too big or too small. Batteries for key fobs are sold under various names, including CR2016 and even CR2032. These batteries are not interchangeable. The best way to determine the type to buy is to consult your owner's manual or examine the fob for a sticker with a label that contains the specific information. Once you've found the correct battery that you want to replace, it can be done within a matter of minutes. Most fobs include the option of a slider, switch or a gap which can be used to open the cover off and replace the battery that was used. Make sure the new battery has the same voltage as the previous one and is properly inserted. Water damage Even if your key fob survived the wash cycle or an immersion in the pool, water is not good for electronics. It can harm the chip, and even destroy the battery. Fortunately, there are ways to minimize the damage. It's crucial to first eliminate the battery and then dry the inside as possible. You can also clean the battery using a cotton swab that is dipped in 90 percent alcohol. After you've cleaned your key fob, you should wait for a few days to completely dry. You can accelerate the process by placing it on a shelf where it will not be disturbed. Once you're sure that it's bone dry try putting in a new battery and operating it in the same way as you normally would. If the key fob isn't working, you could have a faulty receiver module that isn't able to transmit signals to your car. It's expensive to fix, but it's definitely worth trying if you want to avoid having to buy a new one. The easiest method to fix a malfunctioning key fob is to replace the battery. The radio signal should be restored and your key fob will be operational again after changing the battery. If the problem persists you should seek assistance from a professional. Receiver module that is defective In some cases there may be a problem with the receiver module of the key fob might hinder it from receiving or transmitting proper signals. If this is the situation, your car will not recognize your remote control key, and will not unlock or start the engine. In this instance you'll need another replacement. Consult your owner's guide before attempting to reprogram the key fob on your own. First, make sure that the battery in the key fob is in good health and that all buttons are working. Also, shut the doors and remove any accessories like alarm systems or radios from the vehicle. You can also clean the chip using isopropyl or electronic cleaner. If the chip has been damaged, you'll need to replace it. After cleaning the key fob, remove the circuit board. Clean the contacts using alcohol swabs and allow them to dry. Once the contacts have dried then you can reassemble and test the key fob. If the key fob isn't working, it might be required to replace the battery. Make sure you choose a battery with the same voltage that the original battery. It is recommended to make sure the battery is installed correctly because the contact points can be very sensitive. Keyless entry systems that fail The key fob is a wonderful feature for cars, but it can be a hassle when it stops working. The good news is that most of the time, it's easy to get it working again. The most typical cause of a malfunctioning key fob is a dead coin battery, which is easily replaced in a matter of minutes. Other causes are signal interference or a malfunctioning module and other electrical issues. The first step is to ensure that the battery is properly inserted and has the right voltage. The correct type of battery is also crucial. The internal circuitry of the device may be damaged when you use the wrong battery, or one that isn't the correct size or is not polarized. Also, you should check the fuses to ensure they are not blown or have not melted. Another possibility is that the transponder within the key might have been damaged or lost. This issue will require an investigation by a professional mechanic or dealer in cars. Many dealerships and auto locksmiths can reprogram the car's key fob at a cost, but this can be costly. It could be worthwhile to reprogram your spare fob if you own one. The Key Lab are usually found in the owner's manual. If you don't have the manual, you can locate instructions online or on YouTube. It is crucial to check the owner's guide before making any repairs on the key fob.