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Citroen C3 Key Fob Troubleshooting Citroen key fobs can cease to function due to a variety of causes. These include worn buttons poor battery contact, water damage and issues with the receiver module. You should also check the 12 volt battery. If your key fob does not unlock your car, you could be experiencing deprogramming. This occurs when certain button actions send an instruction to the onboard computer to remove the key from its access list. Dead coin battery If your Citroen C3's key fob has stopped working The first thing you need to look for is if the battery is dead. The batteries that are in the fobs are tiny, round coins that can be easily replaced in a matter of minutes. They are available at the general stores, home improvement stores, and a few auto parts stores. Be sure to buy the right type. Batteries for fobs are typically CR2025 or CR2032, however you should refer to the owner's manual of your vehicle to determine what type is required. Take off the button pad and then use cotton swabs or alcohol to clean it. This will help remove corrosion, and clean the contacts that are typically gold-colored. Once the contacts have been cleaned it is time to insert the new battery. Be careful not to mix the two types as they have different voltages and diameters. The next step is to check the battery's voltage. You can get a precise reading using a multimeter, which is set to the battery's voltage range. If the battery has a value above or below its threshold, it will need to be replaced. You could also try getting your car started using a spare key, but this may not work in all situations. If the issue continues, visit an CITROEN dealership with your V5 registration and personal identification documents. A CITROEN dealer can find the code of your vehicle's immobiliser and order a new battery. Water damage If the key fob is submerged it could lose its signal. It is recommended to remove it as quickly as possible out of the pool or puddle. Once you have done that dry the circuit board as best you can using the help of a cotton swab, dipped into isopropyl ethanol or electronic cleaner. If the key fob isn't working, it may be time to invest in an additional one. Another reason that can be cited for Citroen c3 remote control not working is signal interference. This could happen when there is an intense electrical field in the vicinity of the car or from other transmitters on the same frequency. The key fob should start to function again after you have left the area of interference. The Citroen c3 key fob can stop working due to worn buttons, signal interference, receiver module issues, a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, you'll need to get it reprogrammed by an expert. This can be done either by a trained mechanic or an Citroen dealer. If the problem is serious it is possible to replace the device. This is a simple and inexpensive fix, but it's imperative to act swiftly. If you put off fixing the issue, the worse it becomes. If the issue isn't fixed, it can be dangerous for passengers and you. Issue with the Receiver module If your key fob isn't working the receiver module could have developed a fault. Water damage is among the numerous reasons. It can happen when you drop your keys or wash them. You can try to resolve the issue by removing and cleaning the chip using isopropyl alcohol or electronic cleaner. This will stop the chip from corroding. You can also reset the receiver module by disconnecting it from the car battery, and waiting for 10 seconds. Then, reconnect the battery to the vehicle and repeat the process. If this doesn't fix the issue, go to a dealership and have it replaced. Interference can also cause your key to stop working. This could be caused by other transmitters using the same frequency or objects in your vehicle. If you're not able to solve the issue, you can bring your key fob to an authorized dealer and have it changed to a different frequency. 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 correct, the receiver module will not recognize the key and display a key not detected message. This can be a gruelling issue, especially if you're trying to start your vehicle. Dead 12 volt battery If your key fob ceases working after the battery has been changed, it may be damaged. This is especially common when the key fob is dropped or stepped on, however it can also happen following service on your car that requires removal and reinstallation of panels. When these panels are removed, the wires are exposed. If your fob is damaged, you may require a complete replacement. Another possibility is that the remote is receiving interference from other devices or locations. This can cause RF signals to become weaker and block the car's recognition of the remote. If this happens you can reset all on-board computers by disconnecting the 12 volt battery for approximately 15 minutes. This will erase any remaining electricity and let the system start over. It is essential to confirm the size and quality of the battery before replacing it. The circuit board that is inside the fob's key could be damaged in the event that the replacement battery is too big or has a different voltage. Before installing a new battery, you should clean the chip inside the fob to remove any contaminants that could cause corrosion. The right battery type can ensure that the key fob is sealed and protected from moisture. Once G28 is put back in place, it should function normal. In most instances, you will be able to use the second key to start your car even if it shows a message of “key not recognized.” It is possible to press the button several times before it responds.