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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can stop working for a variety of reasons. These include worn buttons poor contact with the battery, water damage and receiver module issues. You should also examine the battery's 12 volts. Deprogramming could be the reason the key fob's inability to unlocking your car. This occurs when certain button actions send an indication to the onboard computer to remove the key from its list of access. Dead coin battery If your Citroen's C3's key fob has stopped working, the first thing to look for is if the battery is dead. The batteries inside the fobs are small, round coins that can be easily replaced within a few moments. They are available at the general stores, home improvement stores, and some auto parts stores. Make sure you purchase the correct model, however. Batteries for fobs are usually CR2025 or CR2032, however, you should consult the owner's manual of your vehicle to determine which kind is required. Before you replace the battery, take off the button pad and rub it using cotton swabs and alcohol. These will help remove corrosion and clean the contacts, which are usually colored gold. Once the contacts have been cleaned, it is now time to put in the new battery. Be careful not to mix up the two types as they have different voltages, dimensions, and shapes. The next step is to test the battery's current voltage. A multimeter that is set to the battery's voltage range should give you a reliable reading. If the battery has the value that is either above or below its threshold, it will need to be replaced. You can also start your vehicle by using a spare key. However, this may not always work. If the issue persists, go to a CITROEN dealership with your V5 registration and personal identity documents. A CITROEN dealer can obtain the code for your vehicle's immobiliser system, and get an alternative battery. Water damage If the key fob is submerged, it could lose its signal to the car. It is recommended to remove it as soon as possible from the puddle or pool. After that, dry out the circuit board as much as you can with a cotton swab dipped in isopropyl alcohol or an electronic cleaner. If it still doesn't work then it's time to get a new key fob. Another common reason the most common reason for Citroen c3 remote control not working is signal interference. This could happen when there is an intense electrical field near the vehicle or from other transmitters operating on the same frequency. The key fob should start to work again once you leave the zone of interference. Lastly, the Citroen c3 key fob can cease to function due to worn buttons, signal interference, receiver module issues, a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, you'll require it to be changed by a certified expert. This can be done by a certified mechanic or a Citroen dealer. If the issue is severe it is possible to replace it. It's an easy and inexpensive fix. However, you need to be quick to act. The longer you put off taking action to address the issue, the more serious it will get. It could be hazardous to you and your passengers if the problem is not 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. Water damage is one of the many reasons. It can happen when you drop your keys, or wash them. It is possible to fix the problem by removing and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will help to stop the chip from corroding. You can also reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then reconnect the battery to the vehicle and repeat the process. If this doesn't resolve the issue, visit a dealership to get it replaced. Another reason why your key might stop working is due to interference. This can be caused either by other transmitters using the same frequency or objects inside your vehicle. If you are unable fix the issue, 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 is not accurate the receiver will not recognize the car key and display a message saying “key not recognized”. This can be a frustrating issue especially when you attempt to start your car. Dead 12 volt battery If your key fob ceases working after changing the battery it could be damaged. This is more likely when the key fob been thrown or stepped on however, it can also be the result of a service that requires the removal of panels and then reinstallation. When the panels are removed, the wires are exposed. If your fob has been damaged, it may require replacement. Another possibility is that the remote receives interference from other devices or locations. This could cause RF signals to weaken, preventing the car from recognizing the remote. If this happens you can reset the on-board computers by disconnection of the battery at 12 volts for around 15 minutes. citroen berlingo key fob will erase any remaining electric current, allowing your system to restart. It is essential to verify the size and quality of the battery before replacing it. The circuit board in the fob's key can become damaged when the replacement battery is too large or has a different voltage. You should also remove any corrosive materials off the chip in the fob prior to installing a new battery. The proper type of battery will ensure that the key fob is sealed and shielded from moisture. Once the key fob is put back in place, it should function normally. It is possible to use the second key in the event that your vehicle displays a message saying “key not detected.” It might be necessary to press the button a few times before it responds.