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Citroen C3 Key Fob Troubleshooting The Citroen c3 keyfob may cease to function due to different reasons. This includes worn buttons, poor contact between the battery and the water and receiver module problems. Make sure the batteries are 12 volts. If the key fob will not unlock your car, you may be experiencing deprogramming. This happens when certain key sequences send a signal to the computer in the car to delete the key from its access list. Dead coin battery If the key fob on your Citroen C3 is no longer working, first make sure the battery is dead. The batteries inside the fobs are small round coins that can be easily changed in a matter of seconds. They are sold in general stores, home improvement stores, and auto parts stores. Be sure to buy the correct kind. Batteries for fobs are typically CR2025 or CR2032 However you should refer to the owner's manual of your vehicle to determine which type is required. Before you replace the battery, take off the button pad and rub it with alcohol and cotton swabs. This will remove any corrosion and clean the contacts that typically have a gold color. After cleaning the contacts, you can insert the new battery. Just be careful not to mix the two types because they differ in their voltages and diameters. Next, you will need to assess the voltage of the battery. A multimeter that is set to the battery's voltage range should give you a reliable reading. If the battery's reading is above or below threshold, it needs to be replaced. Try starting your car with a spare key, but this might not be successful in all instances. If the issue continues, go to a CITROEN dealership with your V5 registration number and personal identity documents. A CITROEN dealer can retrieve the code for the immobiliser on your vehicle and request the replacement battery. Water damage If the key fob is submerged, it could lose its signal. It is recommended to remove it as soon as you can from the pool or puddle. Once you have done that, dry out the circuit board as much as you can with a cotton swab that has been dipped in isopropyl alcohol or electronic cleaner. If the key fob isn't working, it could be time to buy a new one. Signal interference is a different cause of Citroen remote controls not working. This can happen when there is an electrical field in the vicinity of the vehicle or other transmitters on the same frequency. The key fob should begin to work again once you have left the area of interference. Finally, the Citroen C3 key fob may be inoperable due to worn buttons and receivers, signal interference, module issues and a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, you'll likely need to get it reprogrammed by an expert. This can be accomplished by a qualified mechanic or at an Citroen dealership. If the issue is significant then you'll have to get it replaced. This is a fairly easy and inexpensive fix, but it's important to act quickly. The longer you put off taking action to resolve the issue, the worse it will become. If the issue isn't fixed the issue could be a hazard for you and your passengers. Receiver Module Issue If your key fob isn't working the receiver module could have developed an issue. This could be due to various factors that include water damage. This can occur when you accidentally drop your keys or wash them. It is possible to fix it by removing the chip and cleaning it with isopropyl, or electronic cleaner. This will keep the chip from getting damaged. You can reset the receiver module if you disconnect it from the battery for 10 seconds. Then, reconnect the battery and repeat the process. If this doesn't solve the issue, visit a dealership to have it replaced. Interference can cause your key to stop working. It could be caused by other transmitters that use the same frequency as your key fob or by objects in your vehicle. If you are unable to resolve the problem, you can visit a dealer 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 is not correct, the receiver will not recognize the car key and display a message stating “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 the battery has been changed it could be damaged. This is most likely to happen when the key fob has been dropped or stepped on. However, it can also happen after service on your car that requires removal and reinstallation of the panels. Wires are exposed as panels are removed. If your fob is damaged, you may require replacement completely. Another possibility is that the remote is receiving interference from other devices or places. The RF signals can cause to weaken and stop the car from acknowledging the remote. If this is the case, you can reset all on-board computers by disconnecting the 12 volt battery for approximately 15 minutes. This will clear any residual power and allow the system to start over. It is important to check the size and quality of the battery prior to replacing it. The circuit board on the key fob can be damaged if the replacement battery is too big or has different voltage. www.g28carkeys.co.uk is also recommended to clean any corrosive substances from the chip inside the fob before installing the new battery. Making sure you choose the right battery can help ensure that it is sealed and shielded from moisture. Once the key fob has been reinstalled it should function normally. In most instances, you will be able to use the second key to start your car even in the event that it displays an error message that reads “key is not detected.” You may have to press the button a few times before it responds.