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Citroen C3 Key Fob Troubleshooting Citroen key fobs can malfunction due to a variety of reasons. There are a variety of reasons, including worn buttons or poor contact with the battery, water damage, and receiver module problems. Also, you should check the battery's 12 volts. If your key fob does not unlock your car, you may be experiencing deprogramming. This happens when certain button combinations send an alert to the onboard computer, asking that the key be removed from its list of keys. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery has died. Fobs utilize small coins-shaped batteries that can be replaced within a few minutes. They are sold in general stores, home improvements stores, and auto parts stores. Make sure you purchase the correct model. Fobs typically require CR2025 or CR2032 However, you should refer to the owner's manual of your vehicle to find out the specific kind of battery your vehicle requires. Before replacing the battery, take off the button pad and rub it with alcohol and cotton swabs. They will remove the corrosion, and clean the contacts which are usually gold colored. After the contacts have been cleaned, you can insert the new battery. Just be careful not to mix the two batteries because they have different voltages and sizes. 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 current value is in the middle or above the threshold, it needs to be replaced. You may also try starting your car with a spare key, however this may not be successful in all instances. If the issue continues, visit a CITROEN dealer with your V5 registration certificate and personal identification 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 gets under water, it could lose its signal to the car. It's best to remove it as quickly as possible from the puddle or pool. Once you've done that make use of the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If it's still not working It could be time for a new key fob. Signal interference is a different cause of Citroen remote control not working. This can happen when there is an electrical field close to the vehicle or other transmitters operating on the same frequency. The key fob is expected to begin to function again after you have left the area of interference. Lastly, the Citroen c3 key fob can cease to function due to worn buttons signals, signal interference, receiver module issues and a dead 12 volt battery, or a damaged electronic chip. If this happens, you'll need to get it replaced by a skilled technician. This can be done by a certified mechanic or at a Citroen dealership. If the issue is significant it's time to have it replaced. This is a relatively simple and affordable fix, but it's important to act quickly. The longer you delay to fix the issue, the more serious it will get. If the issue doesn't get resolved it could pose a danger for the passengers and yourself. Receiver Module Issue If your key fob stops working, it could be because the receiver module has developed a fault. This can be caused by several things, including water damage. It can happen when you drop your keys or wash them. It is possible to repair the issue by removing the chip and cleaning it with isopropyl or an electronic cleaner. This will prevent corrosion of the chip. You can also try to reset the receiver module by disconnecting it from the car battery, and waiting for 10 minutes. Then reconnect the battery to the vehicle and repeat the process. If this doesn't resolve the issue, go to a dealership and have it replaced. Interference can also cause your key to stop working. It could be caused due to other transmitters that operate on the same frequency as your key fob or even objects in your vehicle. If you're not able to fix the issue, you can take your key fob to a dealer and have it 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 right the receiver won't recognize the car key and display a message that reads “key not recognized”. This could be a frustrating issue, especially when trying to start your car. Dead 12 volt battery It is possible that your key fob may have been damaged if it ceases to function after a change of batteries. This is more common when your key fob has been dropped or stepped upon or stepped on, but it could also happen after a service that requires the removal of panels and the reinstallation. Wires are exposed as panels are removed. If your fob is damaged, you may require replacement completely. A fob that is receiving interference from other devices and locations is another possibility. This can cause RF signals to weaken and block the car from being able to recognize the remote. If citroen key happens you can reset the on-board computers by disconnection of the battery that is 12 volts for about 15 minutes. This will eliminate any remaining power, allowing the system to restart. Before replacing the battery it's crucial to ensure it's the correct size and type. If the replacement battery isn't big enough or has a different voltage, it can damage the circuit board in the fob's key. You should also remove any corrosive materials from the chip inside the fob prior to installing a new battery. The correct battery type will ensure that the key fob is properly sealed and protected against moisture. Once the key fob's been reinstalled, it should function normally. You can usually use the second key even if your car displays a message stating “key is not recognized.” It could be necessary to press the button several times before it responds.