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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can not function for a variety of reasons. There are a variety of reasons, including worn buttons that are not in contact with the battery, water damage, and receiver module issues. Check the 12 volt batteries. Deprogramming could be the reason the key fob's not unlocking your car. This occurs when certain button combinations send an email to the onboard computer asking that the key be removed from its list of keys. Dead coin battery If your Citroen's C3's key fob isn't working, the first thing to check is if the battery is dead. Fobs have small coins-shaped batteries that can be replaced in a few minutes. They are available at the general stores, home improvement stores, as well as some auto parts stores. Be sure to purchase the correct model, however. Fobs typically require CR2025 or CR2032 However, it is recommended to check the owner's manual to determine the exact type of battery your car requires. Before you replace the battery, remove the button pad and rub it using cotton swabs and alcohol. They will remove the corrosion and clean the contacts, which are typically colored gold. Once the contacts are cleaned then you can put in the new battery. Be careful not to mix the two batteries as they have different voltages, sizes and diameters. Next, you will need to determine the voltage of the battery. A multimeter set to the battery's voltage range will give you a reliable reading. If the battery's voltage is in the middle or above the threshold, then it needs to be replaced. You can also start your vehicle with a spare keys. However, this may not always work. If the problem persists go to a CITROEN dealership with your V5 registration and personal identity documents. A CITROEN Dealer can retrieve the code of your vehicle's immobiliser and can order an upgrade to your battery. Water damage When the key fob goes underwater it may lose its signal to the car. It is best to remove it as soon as you can from the puddle or pool. After that, dry out the circuit board in the best way you can using a cotton swab dipped in isopropyl alcohol or an electronic cleaner. If the key fob doesn't function, it might be time to get an entirely new one. Signal interference is another frequent reason for Citroen remote controls not working. This can occur when there is an electrical signal near the vehicle or other transmitters using the same frequency. The key fob should begin to function again after you are out of the area of interference. The Citroen C3 key fob might cease to function due to worn buttons or signal interference issues, receiver module problems or a dead 12-volt battery, or a defective chip. If this happens, you'll probably require it to be reset by a professional. This can be accomplished by a qualified mechanic or at a Citroen dealership. If the issue is significant, you'll need to have it replaced. It's a fairly simple and affordable fix. But you must be quick to act. The longer you put off taking action to correct the issue the worse it will become. It could be dangerous for passengers and you when the issue is not addressed. Issue with the Receiver module If your key fob ceases working, it might be due to the receiver module having developed an issue. Water damage is one of the numerous causes. It can happen when you drop your keys or wash them. You can fix the problem by removing and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will stop the chip from getting corroded. You can also reset the receiver module if you disconnect it from the battery for 10 seconds. Then reconnect the battery to the vehicle and repeat the process. If this doesn't fix the issue, bring it to a dealer to be repaired. Another reason why your key could stop working is due to interference. This can be caused either by other transmitters using the same frequency or objects inside your vehicle. If you are unable to fix the issue, bring your key fob to an authorized dealer and have it replaced. The key fob contains a short-range radio transmitter/radio-frequency identification (RFID) chip and antenna, which sends a distinct coded signal to the receiver module in your car. If the signal isn't correct it will not recognize the car key and display a message that reads “key not recognized”. This can be a frustrating issue, particularly when trying to start your car. Dead 12 volt battery If your key fob stops working after changing the battery It could be damaged. This is more common when the key fob been dropped or stepped upon however, it can also occur following a repair that requires the removal of panels and reinstallation. When G28 are removed, wires are exposed. If your fob is damaged, you might require replacement completely. Another possibility is that the fob may be receiving interference from other devices or locations. This can make RF signals less effective and hinder the car from recognizing the remote. If this is the case you can reset all on-board computers by disconnecting the battery that is 12 volts for about 15 minutes. This will eliminate any remaining electrical charge and allow the system to start from scratch. Before replacing the battery, it's crucial to ensure it is the correct size and type. The circuit board on the fob's circuit board could be damaged when the battery you replace is too large or has an unrelated voltage. It is also recommended to clean any corrosive substances from the chip inside the fob prior to installing a new battery. Making sure you choose the right battery can help ensure that it is sealed and shielded from moisture. After the key fob has been installed, it will function normal. In the majority of instances, you will be able to use the second key to start your car in the event that it displays the message “key is not detected.” You may have to press the button a few times before it responds.