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Citroen C3 Key Fob Troubleshooting Citroen c3 key fob can not function for many reasons. The most common reasons are worn buttons and poor contact with the battery, water damage, and receiver module problems. Examine the 12 volt batteries. Deprogramming could be the reason the key fob's inability to 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, check first if the battery has died. Fobs have small coins-shaped batteries that can be replaced in just a few minutes. You can find these at home improvement stores, and a few auto parts stores. Make sure you purchase the correct model, however. The batteries for fobs are usually CR2025 or CR2032, however you should refer to the owner's manual of your vehicle to determine what kind is required. Before replacing the battery, take off the button pad and rub it using cotton swabs and alcohol. This will remove any corrosion, and clean the contacts, which typically have a gold color. Once the contacts have been cleaned, it is now time to install the new battery. Be careful not to mix the two types because they have different voltages and sizes. Next, you will need to determine the voltage of the battery. A multimeter calibrated to the battery's voltage range should provide a precise reading. If the battery has a value above or below its threshold, it will need to be replaced. Try getting your car started using an additional key, however it may not be successful in all instances. If the problem continues, go to an CITROEN dealership with your V5 registration and personal identity documents. A CITROEN dealer can find the code for your vehicle's immobiliser and can order the replacement battery. Water damage If the key fob is submerged, it may lose its signal. If this happens, it's a great idea to remove it of the pool, puddle, or washing machine as fast as you can. After that dry the circuit board in the best way you can with a cotton swab that has been dipped in isopropyl alcohol or electronic cleaner. If it still doesn't work, it may be the time to replace your key fob. Another reason that can be cited the most common reason for Citroen remote control c3 not working is signal interference. It can happen when there is an electrical field close to the car or other transmitters operating on the same frequency. The key fob should start to work again once you leave the area of interference. The Citroen C3 key fob may not function because of worn buttons problems with signal interference, receiver module issues or a dead 12-volt battery or a damaged chip. If this happens, you'll probably have to have it changed by a certified expert. This can be done either by a qualified mechanic or an Citroen dealer. If the issue is severe then you'll have to get it replaced. It's a relatively easy and inexpensive fix. But you should take action quickly. The longer you wait to resolve the issue, the more severe it will be. If the issue isn't resolved it could be a risk for the passengers and yourself. Receiver Module Issue If your key fob isn't working the receiver module could have developed an issue. This could be due to several things such as water damage. This can happen if drop your keys, or wash them. You can resolve the issue by removing and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will keep the chip from corrosion. You can reset the receiver module if you disconnect it from the battery and then wait 10 seconds. Then, reconnect the battery to the car and repeat the procedure. If this does not resolve the issue, take it to a dealer for replacement. Another reason your key could stop working is due interference. It could be caused due to other transmitters that use the same frequency as your key fob or even objects in your vehicle. If you're not able to fix the issue, go to a dealership 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 is not accurate the receiver will not recognize the car key and display a message telling you “key not detected”. This could be a very frustrating issue, especially when trying to start your car. citroen c1 car key replacement is possible that your key fob is damaged if it stops working after a change of batteries. This is most likely to happen when the key fob has been dropped or stepped on, but it can also happen following service on your car which requires the removal and reinstallation of the panels. Wires are exposed when the panels are removed. If your fob is damaged, you may have to replace it completely. A fob that receives interference from other devices and locations is a different possibility. This could make RF signals less effective and hinder the car from recognizing the remote. You can reset the onboard computer if this is the situation, by disconnecting the 12-volt battery for 15 minutes. This will remove any residual electric current, allowing your system to reboot. Before replacing the battery, it's crucial to ensure it's the correct type and size. The circuit board on the fob's key can become damaged if the replacement battery is too big or has an incompatible voltage. You should also clean any corrosive materials off the chip in the fob prior to installing a new battery. Using the correct type of battery can help ensure that it is sealed and protected from moisture. Once the key fob is replaced, it should work normally. In the majority of instances, you will be able to use the second key to start your car if it shows the message “key not detected.” It is possible to press the button a few times before it responds.