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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can stop working due to a variety of reasons. The most common reasons are worn buttons that are not in contact with the battery, water damage, and receiver module problems. Also, you should check the 12 volt battery. Deprogramming is a possible cause of your key fob not unlocking your car. This occurs when certain button actions send a signal to the computer onboard to remove the key from its list of access. Dead coin battery If your Citroen C3's key fob isn't working the first thing you should examine is whether the battery is dead. Fobs are small coin-shaped batteries which can be replaced within a few minutes. They can be found in general stores, home improvements stores and auto parts stores. Be sure to purchase the correct model, however. The batteries for fobs are usually CR2025 or CR2032, however you must consult the owner's manual of your vehicle to determine which kind of battery is needed. Take off the button pad and use cotton swabs and alcohol to clean it. These will help remove corrosion, and clean the contacts which are usually gold-colored. After the contacts have been cleaned, you can then put in the new battery. Be careful not to mix up the two types as they differ in voltage, sizes and diameters. The next step is to test the battery's current voltage. You can get an accurate reading using a multimeter that is set to the battery voltage range. If the battery has a voltage that is higher or lower than its threshold, it is required to be replaced. Try starting your car with a spare key, but this might not work in all situations. If the issue persists, go to an CITROEN dealership with your V5 registration and identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser and purchase the replacement battery. Water damage If the key fob is submerged it can lose its signal. It is advised to remove it as soon as possible out of the pool or puddle. Once you've done that, use the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If it's still not working then it's the time to replace your key fob. Signal interference is a different reason for Citroen remote control not working. This could happen if there is an electrical field close to the car or other transmitters operating on the same frequency. The key fob should begin to work again once you have left the area of interference. The Citroen C3 key fob can not function because of worn buttons or signal interference issues, receiver module problems or a dead battery or a malfunctioning chip. If this happens, you'll probably need to get it reset by a professional. This can be done by a qualified mechanic, or an Citroen dealer. If the problem is serious you may have to replace it. This is a relatively simple and inexpensive fix, but it's essential to act quickly. If you put off fixing the issue, the worse it becomes. If the issue isn't resolved it could be a risk for passengers and you. Receiver Module Issue If your key fob stops functioning, it could be because the receiver module has developed a fault. Water damage is one of the many reasons. This can happen if you lose your keys, or wash them. You can fix it by removing the chip and cleaning it with isopropyl, or electronic cleaner. This will help to keep the chip from getting damaged. 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 car and repeat the procedure. If this doesn't solve the issue, go to a dealership and have it replaced. Interference can also cause your key to stop working. This can be caused by other transmitters that operate on the same frequency as your key fob, or by objects in your vehicle. If you're not able to fix the problem, you can visit a dealer to get your key fob reprogrammed. 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 accurate the receiver won't recognize the car key and display a message that reads “key not recognized”. This can be a frustrating issue especially when trying to start your car. Dead 12 volt battery If your key fob ceases working after an upgrade to a battery the device could be damaged. This is more common if 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 when these panels are removed. If your fob is damaged, you may require replacement completely. A fob that is receiving interference from other devices or locations is a second possibility. This can make RF signals weaker and prevent the car from being able to recognize the remote. You can reset the on-board computer in this scenario by disconnecting your 12-volt battery for 15 minutes. This will eliminate any remaining electrical charge and allow the system to restart from scratch. It is crucial to determine the size and type of the battery prior to replacing it. The circuit board in the fob's key can become damaged when the battery you replace is too large or has an unrelated voltage. Before installing a battery, you should clean the chip inside the fob in order to eliminate any corrosive substances. The correct battery type will ensure that the key fob is sealed and protected from moisture. Once the key fob has been reinstalled, it will function normally. You should be able to use the second key when your car displays a message stating “key not detected.” The Key Lab may need to press the button several times before it responds.