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Citroen C3 Key Fob TroubleshootingCitroen c3 key fobs can not function for different reasons. This includes worn buttons, poor contact between the battery and the water and issues with the receiver module. Check the 12 volt battery.If your key fob does not unlock your car, it could be experiencing deprogramming. This happens when certain key sequences send an alert to the onboard computer to remove the key from its access list.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 in the fobs are tiny, round coins that can be replaced within a few moments. You can find these at the general stores, home improvement stores, and some auto parts stores. Be sure to purchase the correct model, however. For fobs, batteries are typically CR2025 or CR2032, however, you should consult the owner’s manual for your vehicle to determine what kind of battery is needed.Take off the button pad and use cotton swabs and alcohol to clean it. These will help remove corrosion and clean the contacts, which are typically colored gold. Once the contacts are cleaned, you can install the new battery. Be careful not to mix the two kinds because they have different voltages and diameters.Next, you will need to determine the voltage of the battery. You can get a reliable reading using a multimeter that is set to the battery’s voltage range. If the battery’s value is either above or below the threshold, then it needs to be replaced. You can also try the car’s start using an additional key, however this might not be successful in all instances. If the issue persists, visit an CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle’s immobiliser system, and purchase a replacement battery.Water damageWhen the key fob goes submerged, it could lose its signal to the car. It’s best to remove it as fast as possible from the pool or puddle. Once you do, dry out the circuit board as best you can with a cotton swab that has been dipped in isopropyl alcohol or electronic cleaner. If the key fob still isn’t working, it could be time to purchase an additional one.Another common reason the most common reason for Citroen c3 remote control not working is signal interference. This could happen if there is an electrical field near the car or other transmitters on the same frequency. Once you have left the interference area your key fob should begin working again.The Citroen C3 key fob may stop working because of worn buttons signals, signal interference issues receiver module problems as well as a dead 12-volt battery or a damaged chip. You’ll need it reset when this happens. TheKeyLab can be done by a trained mechanic or at a Citroen dealership. If the issue is severe it is possible to replace it. It’s a relatively easy and affordable fix. However, you need to act quickly. The longer you wait to fix the issue, the more serious it becomes. If the issue doesn’t get resolved, it can be dangerous for the passengers and yourself.Receiver Module IssueIf your key fob ceases working, it might be because the receiver module has developed a fault. This could be due to a number of things like water damage. It can happen when you lose your keys, or wash them. You can try to fix the problem by removing and cleaning the chip using isopropyl alcohol, or electronic cleaner. This will stop the chip from corroding.You can reset the receiver module when you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery and repeat the process. If this does not resolve the problem, you can take it to a retailer for replacement.Another reason why your key might not work is due to interference. This can be caused either by other transmitters using the same frequency or by objects inside your vehicle. If you are unable to resolve the problem, you can visit a dealer to have your key fob reset.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 in order, the receiver module will not recognize the key and display an error message that states the key is not detected. This can be a frustrating issue, especially if you’re trying to start your car.Dead 12 volt batteryIf your key fob stops working after an upgrade to a battery it could be damaged. This is most likely to happen if the key fob was dropped or stepped upon, but it can also happen after repair on your vehicle which requires the removal and reinstallation of the panels. When these panels are removed, wires are exposed. If your fob is damaged, you may need to replace it completely.Another possibility is that the fob may be receiving interference from other devices or places. This can cause RF signals to become less effective and hinder the car’s recognition of the remote. If this happens it is possible to reset all on-board computers by disconnecting the 12 volt battery for around 15 minutes. This will erase any remaining electrical charge and allow the system to restart over.It is important to check the size and quality of the battery before replacing it. The circuit board that is inside the fob’s circuit board could be damaged if the replacement battery is too big or has different voltage. Before installing a battery you should clean the chip inside the fob to eliminate any contaminants that could cause corrosion. Using the right type of battery can help ensure that it is sealed and shielded from moisture. After the key fob has been put back in place, it should function normal. In the majority of instances, you will be able to use the second key to start your car, even in the event that it displays a message of “key not detected.” It could be necessary to press the button a few times before it responds.