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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can cease to function due to a variety of reasons. These include worn buttons poor contact with the battery, water damage, and receiver module issues. Make sure the batteries are 12 volts. Deprogramming may be the cause that your key fob isn't unlocking your car. This occurs when certain button combinations send an electronic message to the computer, asking that the key be removed from its list of keys. 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. You can find these at home improvement stores, and some auto parts stores. Be sure to buy the correct model. Fobs usually require CR2025 or CR2032 However, you should look through the owner's guide to determine the type of battery that your car requires. 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. Once the contacts are cleaned then you can put in the new battery. Just be careful not to mix the two kinds because they have different voltages and diameters. Next, you will need to test the voltage of the battery. A multimeter that is calibrated to the battery's voltage range will give you an accurate reading. If the battery's current value is either above or below the threshold, then it must be replaced. You can also try to start your car using a spare key, but this might not be effective in all cases. If the problem persists then visit an CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser system, and get the replacement battery. Water damage When the key fob gets underwater it may lose its signal to the car. If this happens, it's a good idea to fish it out of the pool, puddle or washing machine as soon as you can. After this, use a cotton swab and isopropyl or electronic cleaner to clean the circuit board. If the key fob still isn't working, it could be time to invest in an entirely new one. Another reason that is commonly cited for Citroen c3 remote control not working is signal interference. This could happen if there is an electrical signal near the car or other transmitters on the same frequency. The key fob should start to function again after you leave the zone of interference. The Citroen C3 key fob could not function because of worn buttons or signal interference issues, receiver module problems or a dead battery or a malfunctioning chip. You'll need it replaced in the event of this. This can be done by a trained mechanic or an Citroen dealer. If the issue is severe you may have to replace it. It's a simple and inexpensive fix, but it's imperative to act swiftly. The longer you wait to fix the issue, the more difficult it gets. It could pose a risk to passengers and yourself if the problem is not addressed. Receiver Module Issue If your key fob ceases working, it could be due to the receiver module having developed an issue. This can be caused by many things, including water damage. It can happen when you drop your keys, or wash them. It is possible to resolve the issue by removing and cleaning the chip with isopropyl alcohol or electronic cleaner. This will stop the chip from corroding. You can reset the receiver module when you disconnect it from the battery, and wait 10 seconds. You can then reconnect the battery and repeat the procedure. If this doesn't solve the issue, you can visit a dealership to have it replaced. Interference can cause your key to stop working. It could be caused by other transmitters on the same frequency or objects inside your vehicle. If you're unable fix the problem, you can go to a dealership 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 isn't accurate, the receiver will not recognize the car key and display a message that reads “key not detected”. This can be a frustrating issue, especially if you're trying to start your car. Dead 12 volt battery If your key fob stops working after a battery change It could be damaged. This is more frequent when the key fob been thrown or stepped on however, it can also be the result of a service that requires the removal of panels and the reinstallation. When these panels are removed, the wires are exposed. If your fob is damaged, you may have to replace it completely. citroen berlingo key replacement The Keylab that is receiving interference from other devices and locations is a different possibility. This can cause RF signals to weaken and stop the car from understanding the remote. If this is the case you can reset the on-board computers by disconnecting the battery that is 12 volts for approximately 15 minutes. This will remove any residual electrical energy, allowing the system to restart. It is important to check the size and type of the battery before replacing it. If the replacement battery is too small or has different voltage, it can damage the circuit board inside the key fob. Also, you should clean any corrosive substances from the chip in the fob before installing a new battery. The proper type of battery will ensure that the key fob is properly sealed and shielded from moisture. After the key fob has been reinstalled, it should work normally. In the majority of instances, you can use the second key to start your car even when it displays the message “key not found.” It may be necessary to press the button a few times before it responds.