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Citroen C3 Key Fob TroubleshootingThe key fob of the Citroen C3 can stop working due to many reasons. Some of these include worn buttons that are not in contact with the battery, water damage and receiver module problems. You should also check the 12 volt battery.Deprogramming could be the cause of your key fob not unlocking your car. This occurs when certain button actions send an indication to the onboard computer to erase the key from its list of access.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer working, first determine if the battery has gone out. Fobs use small, coin-shaped batteries that can be replaced in just a few minutes. You can find these at the general stores, home improvement stores, and some auto parts stores. Make sure you purchase the correct kind. Fobs usually require CR2025 or CR2032 However, it is recommended to refer to the owner's manual of your vehicle to find out the specific type of battery your car requires.Remove the button pad and use cotton swabs and alcohol to clean it. This will help remove corrosion, and clean the contacts that are usually gold-colored. After the contacts have been cleaned, you are able to add the new battery. Just be careful not to mix the two types because they differ in their voltages and diameters.The next step is to test the voltage of the battery. A multimeter calibrated to the battery's voltage range will provide a precise reading. If the battery is at a value above or below its threshold, it is required to be replaced. You could also start your car with a spare keys. However, this might not always work. If the problem persists visit a CITROEN dealership with your V5 registration and identity documents. A CITROEN dealer will be able to retrieve the code for the immobiliser on your vehicle and purchase a replacement battery.Water damageIf the key fob is under water, it could lose its signal to the car. If this occurs, it's a good idea to remove it from the pool, puddle or washing machine as quickly as you can. Once you do dry the circuit board as best you can with a cotton swab that has been dipped in isopropyl alcohol or an electronic cleaner. If the key fob still isn't working, it could be time to get another one.Another common reason one of the main reasons for Citroen remote control c3 not working is signal interference. This could happen when there is an intense electrical field close to the vehicle or from other transmitters operating on the same frequency. The key fob will begin working once you are out of the zone of interference.The Citroen C3 key fob may be inoperable due to worn buttons signals, signal interference issues receiver module issues or a dead 12-volt battery or a defective chip. If this happens, you'll have to have it replaced by a skilled technician. This can be done by a certified mechanic or at a Citroen dealership. If the issue is serious, you may need to replace the device. It's a fairly simple and inexpensive fix. However, you need to be quick to act. The longer you put off fixing the problem, the worse it becomes. If the issue isn't resolved, it can be dangerous for you and your passengers.Receiver Module IssueIf your key fob isn't functioning, the receiver module may have developed a fault. This could be due to a number of things such as water damage. It can happen when you drop your keys, or wash them. It is possible to repair the issue by removing the chip and cleaning it with isopropyl and electronic cleaner. This will prevent the chip from corrosion.You can reset the receiver module when you disconnect it from the battery for 10 seconds. Then reconnect the battery to the car and repeat the procedure. If this doesn't resolve the issue, go to a dealer to have it replaced.Interference can also cause your key to stop working. This can be caused either by other transmitters using the same frequency or objects inside your vehicle. If you're unable to fix the issue, you can bring your key fob to an authorized dealer to have it 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 right the receiver won't recognize the car key and display a message telling you "key not detected". This is a problem that can be frustrating, especially when trying to start your vehicle.Dead 12 volt batteryIf your key fob stops working after changing the battery the device could be damaged. This is particularly true in the event that the key fob was dropped or stepped on, but it can also happen after repair on your vehicle which requires the removal and reinstallation of panels. When these panels are removed, the wires are exposed. If your fob is damaged, it may require replacement.A fob that is receiving interference from other devices and locations is also a possibility. This can make the RF signals weaker and prevent the car's recognition of the remote. You can reset the on-board computer if this is the scenario by disconnecting your 12-volt battery for 15 minutes. This will remove any remaining electrical charge and allow the system to start from scratch.It is essential to confirm the size and quality of the battery prior to replacing it. If the battery you replace isn't big enough or has an incompatible voltage, it could harm the circuit board in the fob's key. Before installing The Key Lab , you should clean the chip of the fob to eliminate any corrosive substances. Using the right battery can help ensure that it is sealed and shielded from moisture. Once the key fob's been reinstalled it should function normally. You should be able to use the second key the car displays a message saying "key is not recognized." You may have to press the button a few times before it responds.