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Citroen C3 Key Fob TroubleshootingCitroen c3 key fob can not function for various reasons. These include worn buttons, poor contact between the battery and the water and receiver module problems. It is also recommended to check the 12 volt battery.If the key fob does not unlock your car, you could be experiencing deprogramming. This happens when certain key sequences 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 determine if the battery has died. Fobs utilize small coin-shaped batteries which can be replaced in just a few minutes. They are sold in general stores, home improvement stores, and auto parts stores. Make sure you purchase the correct model. Batteries for fobs are usually CR2025 or CR2032, however, you should consult the owner's manual for your vehicle to determine what kind is required.Take off the button pad and then use cotton swabs or alcohol to clean it. They will remove the corrosion and clean the contacts, which are typically colored gold. Once the contacts have been cleaned it is time to insert the new battery. Be careful not to mix up the two kinds as they differ in voltage, diameters and shapes.The next step is to test the battery's voltage. A multimeter that is set to the battery's voltage range will give you a reliable reading. If the battery's reading is higher or lower than the threshold, it should be replaced. You may also be able to start your car using a spare key. However, this might not always work. If the problem persists go to an CITROEN dealer with your V5 registration form and personal identifi cation documents. A CITROEN dealer can find the code for your vehicle's immobiliser and order an upgrade to your battery.Water damageIf the key fob falls underwater it may lose its signal to the car. If this happens, it's a good idea to get it out from the pool, puddle, or washing machine as quickly as possible. After you've done this then use an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If the key fob doesn't function, it might be time to invest in another one.Signal interference is a common reason for Citroen remote control not working. This can happen when there is an electrical field in the vicinity of the vehicle or other transmitters using the same frequency. The key fob should start working once you have left the zone of interference.citroen van key replacement thekeylab.co.uk could stop working because of worn buttons signals, signal interference issues receiver module problems as well as a dead 12-volt battery, or a defective chip. If this happens, you'll likely have to have it reprogrammed by an expert. This can be done by a trained mechanic or an Citroen dealer. If the issue is severe the vehicle will need to be it replaced. It's a simple and cost-effective fix, however it's imperative to act swiftly. The longer you wait to fix the issue, the more difficult it gets. If the issue doesn't get resolved it could be a risk for the passengers and yourself.Receiver Module IssueIf your key fob is not working, the receiver module may have developed a fault. This could be due to a number of things such as water damage. It can happen when you lose your keys or wash them. It is possible to solve the problem by removing your chip and cleaning it with isopropyl or electronic cleaner. This will avoid the chip from becoming damaged.You can also reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery and repeat the procedure. If this isn't enough to fix the issue, you can take it to a dealership to be repaired.Another reason why your key could be unable to function is due interference. It could be caused due to other transmitters that operate on the same frequency as your key fob, or by objects within your vehicle. If you're not able to fix the issue, you can take your key fob to an authorized dealer to have it changed to a different frequency.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 doesn't match the receiver module will not recognize the key and display an error message that states the key is not detected. This is a problem that can be frustrating especially when trying to start your car.Dead 12 volt batteryIt is possible that your key fob may have been damaged if it ceases to function after a change of batteries. This is particularly true in the event that the key fob was dropped or stepped upon, but it also can occur after maintenance on your vehicle that requires removal and reinstallation of panels. When the panels are removed, the wires are exposed. If your fob is damaged, you may require replacement completely.A remote that is receiving interference from other devices and locations is a different possibility. This could cause the RF signals to weaken, preventing the car from understanding the remote. If this happens you can reset the on-board computers by disconnecting the battery at 12 volts for around 15 minutes. This will erase any remaining electrical charge and allow the system to begin over.Before replacing the battery, it's important to make sure that it's the right type and size. If the replacement battery isn't big enough or has a different voltage, it can damage the circuit board within the key fob. It is also recommended to clean any corrosive substances from the chip in the fob before installing a new battery. Using the right type of battery can help ensure that it is sealed and shielded from moisture. Once the key fob's been installed, it should work normally. In most instances, you can use the second key to start your car even in the event that it displays a message of "key is not detected." It is possible to press the button several times before it responds.