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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can not function for different reasons. Some of these include worn buttons and poor contact with the battery, water damage, and receiver module issues. It is also recommended to check the 12 volt battery. Deprogramming is a possible cause that your key fob isn't unlocking your car. This occurs when certain buttons send an indication to the onboard computer to remove the key from its list of access. Dead coin battery If your Citroen C3's key fob has stopped working the first thing to check is if the battery is dead. The batteries inside the fobs are tiny, round coins that can be easily replaced in a matter of minutes. They are available at general stores, home improvement stores, and some auto parts stores. Make sure you purchase the correct one, however. For fobs, batteries are typically CR2025 or CR2032, however you must consult the owner's manual for your vehicle to determine which kind is required. Remove the button pad and then use cotton swabs or alcohol to clean it. This will help to remove corrosion and clean the contacts which are typically colored gold. After citroen replacement key fob have been cleaned, it is now time to add the new battery. Be cautious not to mix the two batteries as they have different voltages, diameters and shapes. The next step is to test the battery's voltage. You can get a precise reading using a multimeter, which is calibrated to the battery's voltage range. If the battery shows a value above or below its threshold, it has to be replaced. You can also try the car's start using an extra key, but it may not be successful in all instances. If the issue continues, go to a CITROEN dealership with your V5 registration as well as personal identity documents. A CITROEN dealer can find the code for the immobiliser on your vehicle and purchase new batteries. Water damage When the key fob gets under water, it could lose its signal to the car. If this happens, it's a good idea to fish it out from the pool, puddle, or washing machine as quickly as possible. Once you've done that, use a cotton swab and isopropyl or electronic cleaner to dry the circuit board. If the key fob doesn't function, it might be time to invest in an entirely new one. Signal interference is a different reason for Citroen remote controls not working. It can happen when there is an electrical field close to the car or other transmitters operating on the same frequency. Once you leave the interference area the key fob will be working normally again. The Citroen C3 key fob may stop working due to worn buttons signals, signal interference, receiver module issues and a dead 12 volt battery, or an indefective electronic chip. You'll need to have it reprogrammed when this happens. This can be done by a certified mechanic or at an Citroen dealership. If the issue is serious it may be necessary to replace it. It's a relatively easy and affordable fix. However, you need to take action quickly. The longer you wait to fix the issue, the more serious it gets. It could be hazardous to you and your passengers If the issue isn't addressed. Issue with the Receiver module If your key fob ceases working, it could be due to the receiver module having developed an issue. Water damage is one of the numerous reasons. It can happen when you drop your keys or wash them. You can try to solve the issue by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will keep the chip from getting damaged. You can also reset the receiver module if you disconnect it from the battery and then wait 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. Interference can cause your key to stop working. It can be caused by other transmitters using the same frequency or objects in your vehicle. If you are unable to resolve the issue, go to a dealership to change the key fob's programming. 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 will display a message that says “Key Not Detected. This could be a major issue especially when you attempt 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 changing batteries. This is more frequent when the key fob been thrown around or stepped on or stepped on, but it could also be the result of a service that requires the removal of panels and then reinstallation. Wires become exposed when panels are removed. If your fob is damaged, you may require a complete replacement. Another possibility is that the remote is getting interference from other devices or locations. 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 computer systems on board by disconnecting the 12 volt battery for about 15 minutes. This will eliminate any remaining electrical energy, allowing the system to restart. Before replacing the battery it is essential to ensure that it's the right type and size. If the battery you replace is too small or has an incompatible voltage, it could harm the circuit board in the fob's key. You should also remove any corrosive substances from the chip in the fob prior to installing a new battery. The correct type of battery can ensure that the key fob is sealed and shielded from moisture. After the key fob has been installed, it should work normally. It is possible to use the second key even the car displays a message saying “key not detected.” It is possible to press the button a few times before it responds.