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Citroen C3 Key Fob Troubleshooting Citroen c3 key fob can not function for many reasons. This includes worn buttons, poor contact between the battery and the water and receiver module problems. You should also check the battery's 12 volts. If the key fob does not unlock your car, you may be experiencing deprogramming. This occurs when certain button actions send an alert to the onboard computer to erase the key from its list of access. Dead coin battery If the key fob on your Citroen C3 is no longer working, first make sure the battery has failed. The batteries in the fobs are tiny, round coins that can be easily changed in a matter of seconds. They are available at home improvement stores, and a few auto parts stores. Be sure to purchase the right type. Fobs typically require CR2025 or CR2032 however, you must look through the owner's guide to find out the specific type of battery your car requires. Before you replace the battery, remove the button pad and rub it using cotton swabs and alcohol. This will remove any corrosion, and clean the contacts, which are usually gold-colored. Once the contacts are cleaned then you can put in the new battery. Be careful not to mix the two types as they differ in voltage, diameters and shapes. The next step is to test the battery's current voltage. You can get a precise reading with a multimeter that is set to the battery voltage range. If the battery's current value is higher or lower than the threshold, it needs to be replaced. You can also start your vehicle by using a spare key. However, this might not always work. If the issue persists then visit a CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN Dealer can obtain the code of the immobiliser on your vehicle and purchase an upgrade to your battery. Water damage If the key fob falls underwater it may lose its signal to the car. It's best to remove it as fast as possible from the puddle or pool. Once you have done that, dry out the circuit board in the best way you can with the help of a cotton swab, dipped into isopropyl alcohol, or electronic cleaner. If the key fob isn't working, it may be time to purchase an additional one. Signal interference is another frequent cause of Citroen remote controls not working. This could happen if there is an electrical field near the vehicle or other transmitters operating on the same frequency. The key fob will begin to function again after you have left the area of interference. The Citroen C3 key fob could cease to function due to worn buttons problems with signal interference, receiver module problems or a dead 12-volt battery or a malfunctioning chip. If this happens, you'll probably need to get it reprogrammed by an expert. This can be accomplished by a trained mechanic or a Citroen dealer. If the issue is severe you may have to replace the device. It's an easy and inexpensive fix. But you should take action quickly. The longer you take to fix the issue, the more deteriorated it becomes. If the issue isn't resolved, it can be dangerous for you and your passengers. Receiver Module Issue If your key fob is not working the receiver module could have developed a fault. This could be due to various factors such as water damage. This could happen if you lose your keys, or wash them. It is possible to solve the issue by removing and cleaning the chip using isopropyl alcohol or electronic cleaner. This will keep the chip from becoming corroded. You can reset the receiver module if you disconnect it from the battery, and wait 10 seconds. Then reconnect the battery to the car and repeat the process. If this doesn't solve the issue, you can visit a dealership to have it replaced. Another reason why your key might not work is due to interference. This could be caused by other transmitters on the same frequency, or by objects inside your vehicle. If you're unable to solve the issue, take your key fob to an authorized 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 isn't right the receiver will not recognize the car key and display a message saying “key not recognized”. This could be a frustrating problem, especially when you're trying to start your vehicle. Dead 12 volt battery If your key fob stops working after an upgrade to a battery the device could be damaged. This is most likely to happen when your key fob has been dropped or stepped upon However, it can happen after a service that requires the removal of panels and then reinstallation. citroen keys are exposed when the panels are removed. If your fob has been damaged, it may need to be replaced entirely. Another possibility is that the remote receives interference from other devices or places. This can cause RF signals to become weaker and block the car's recognition of 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 restart from scratch. It is crucial to determine the size and quality of the battery prior to replacing it. The circuit board in the fob's key could be damaged in the event that the replacement battery is too big or has different voltage. It is also recommended to clean any corrosive materials from the chip in the fob prior to installing a new battery. Using the right type of battery can help ensure that it is properly sealed and shielded from moisture. After the key fob has been reinstalled it should function normally. It is usually possible to use the second key the car displays a message that says “key not found.” It might be necessary to press the button several times before it responds.