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Citroen C3 Key Fob TroubleshootingThe key fob of the Citroen C3 can cease to function due to a variety of reasons. This includes worn buttons, poor contact between the battery and the water and receiver module issues. Make sure the batteries are 12 volts.If your key fob does not unlock your car, you may be experiencing deprogramming. This occurs when certain buttons send an alert to the onboard computer to erase the key from its list of access.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer working, first make sure the battery has died. The batteries inside the fobs are tiny, round coins that can be easily replaced in a matter of minutes. They are available in general stores, home improvement stores, and some auto parts stores. Be sure to purchase the correct one, however. For fobs, batteries are typically CR2025 or CR2032 However, you should consult the owner's manual of your vehicle to determine what type is required.Take off the button pad and use cotton swabs and alcohol to clean it. These will help remove corrosion and clean the contacts that typically have a gold color. After the contacts have been cleaned, it is now time to install the new battery. Be careful not to mix the two types because they differ in their voltages and diameters.The next step is to assess the voltage of the battery. You can get an accurate reading using a multimeter, which is set to the battery's voltage range. If the battery's value is above or below threshold, then it needs to be replaced. You can also start your car with a spare keys. However, this might not always work. If the problem persists visit an CITROEN dealership with your V5 registration as well as personal identification documents. A CITROEN Dealer can obtain the code for the immobiliser on your vehicle and purchase an upgrade to your battery.Water damageIf the key fob is submerged it could lose its signal. If this happens, it's a great idea to pull it out from the pool, puddle, or washing machine as quickly as possible. After you've done this, use an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If it still doesn't work, it may be the right time to purchase a new key fob.Signal interference is another common cause of Citroen remote control not working. This could happen if there is an electrical signal near the car or other transmitters on the same frequency. Once you leave the interference area your key fob should begin working again.The Citroen C3 key fob could be inoperable due to worn buttons, signal interference issues, receiver module problems or a dead 12-volt battery or a defective chip. If this happens, you'll probably need to get it changed by a certified expert. This can be done by a trained mechanic or an Citroen dealer. If the issue is serious it's time to have it replaced. This is a relatively simple and cost-effective fix, however it's essential to act quickly. The longer you put off fixing the issue, the more serious it becomes. If the issue doesn't get resolved it could pose a danger for the passengers and yourself.Receiver Module IssueIf your key fob is not working, the receiver module may have developed a fault. Water damage is among the numerous reasons. This can occur when you accidentally drop your keys or wash them. You can try to fix the problem by taking off the chip and cleaning it with isopropyl and electronic cleaner. This will prevent the chip from becoming corroded.You can also reset the receiver module by disconnecting it from the car battery and letting it sit for 10 minutes. Then, reconnect the battery and repeat the procedure. If TheKeyLab doesn't fix the issue, you can visit a dealership to get it replaced.Another reason your key could stop working is due to interference. This can be caused either by other transmitters using the same frequency or objects in your vehicle. If you're unable fix the issue, you can visit a dealer and have your key fob reprogrammed.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 the receiver module will not recognize the key and display a key not detected message. This can be a gruelling issue, especially when trying to start your vehicle.Dead 12 volt batteryIt is possible that your key fob has been damaged if it ceases to function after the change of batteries. This is more common if your key fob has been thrown around or stepped on however, it can also happen after a service that requires the removal of panels and reinstallation. Wires are exposed when these panels are removed. If your fob was damaged, it might require replacement completely.Another possibility is that the fob is receiving interference from other devices or places. The RF signals can cause to weaken and stop the car from recognizing the remote. You can reset the onboard computer in this situation, by disconnecting the 12-volt battery for 15 minutes. This will remove any residual electricity, allowing the system to restart.It is essential to verify the size and quality of the battery prior to replacing it. The circuit board on the key fob can be damaged in the event that the replacement battery is too big or has different voltage. You should also remove any corrosive materials off the chip inside the fob before installing the new battery. Using the right type of battery can help ensure that it is sealed and protected from moisture. Once the key fob is installed, it will function normal. You can usually use the second key even in the event that your vehicle displays a message stating "key is not recognized." You may have to press the button a few times before it responds.