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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can malfunction due to a number of reasons. They can be due to worn buttons, poor battery contact, water damage, and receiver module issues. Make sure the batteries are 12 volts. Deprogramming could be the cause that your key fob isn't unlocking your car. This occurs when certain buttons send an electronic message to the computer asking that the key be removed from its list of keys. Dead coin battery If the key fob on your Citroen C3 is no longer working, check first if the battery is dead. Fobs use small coin-shaped batteries which can be replaced in just a few minutes. You can find these at home improvement stores, and a few auto parts stores. Make sure you purchase the correct type. The batteries for fobs are usually CR2025 or CR2032, however you should refer to the owner's manual of your vehicle to determine what type is required. Remove the button pad, and use cotton swabs and alcohol to clean it. These will help remove corrosion and clean the contacts which are usually gold-colored. Once the contacts have been cleaned, you can then install the new battery. Be careful not to mix the two types as they differ in their voltages and diameters. Next, you will need to check the voltage of the battery. You can get an accurate reading with a multimeter that is set to the battery voltage range. If the battery's current value is in the middle or above the threshold, it needs to 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 visit an CITROEN dealership with your V5 registration and personal identity documents. A CITROEN dealer will be able to retrieve the code for the immobiliser on your vehicle and get a replacement battery. Water damage If the key fob is submerged it can lose its signal. If this happens, it's a good idea to remove it of the pool, puddle, or washing machine as fast as possible. Once you've done that make use of an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If the key fob still isn't working, it could be time to get an additional one. Signal interference is another common cause of Citroen remote control not working. This may occur when there is an intense electrical field in the vicinity of the vehicle, or from other transmitters operating on the same frequency. When you leave the area of interference your key fob will be working normally again. The Citroen C3 key fob may not function because of worn buttons or signal interference issues, receiver module problems, a dead 12-volt battery, or a defective chip. It will need to be reset if this happens. This can be accomplished by a certified mechanic or a Citroen dealer. If the issue is serious, you may need to replace the device. It's a simple and inexpensive fix. But you should be quick to act. The longer you wait to fix the problem, the worse it becomes. It could be dangerous for passengers and yourself If the issue isn't addressed. Issue with the Receiver module If your key fob is not functioning it could be because the receiver module might have developed an issue. This can be caused by many things that include water damage. citroen car keys could happen if you drop your keys, or wash them. You can solve the problem by removing your chip and cleaning it with isopropyl or an electronic cleaner. This will prevent the chip from becoming corroded. You can also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 seconds. Then, reconnect the battery to the car and repeat the procedure. If this doesn't fix the issue, you can visit a dealership to get it replaced. Another reason why your key could stop working is due to interference. It could be caused due to other transmitters that operate on the same frequency as your key fob, or by objects inside your vehicle. If you're unable to solve the issue, take your key fob in to a dealer to be 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 is not correct the receiver won't recognize the car key and display a message that reads “key not detected”. This can be a gruelling issue, especially if you're trying to start your car. Dead 12 volt battery If your key fob stops working after changing the battery the device could be damaged. This is most likely to happen if the key fob was dropped or stepped on, but it could also occur following maintenance on your vehicle which requires the removal and reinstallation of panels. When the panels are removed, the wires are exposed. If your fob is damaged, it may need to be replaced entirely. Another possibility is that the fob is receiving interference from other devices or places. This can cause RF signals to weaken and stop the car from recognizing the remote. You can reset the onboard computer if this is the situation, by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining power and allow the system to restart again. Before replacing the battery, it's crucial to ensure it's the correct type and size. The circuit board in the key fob can be damaged when the battery you replace is too large or has different voltage. Before installing a new battery, you must clean the chip inside the fob in order to eliminate any contaminants that could cause corrosion. The right battery type can ensure that the key fob is sealed and protected against moisture. After the key fob has been put back in place, it should function normal. You can usually use the second key even in the event that your vehicle displays a message that reads “key not detected.” It might be necessary to press the button a few times before it responds.