Citroen C3 Key Fob Troubleshooting
Citroen c3 key fobs can stop working for various reasons. They can be due to worn buttons, poor contact between the battery and the water and receiver module issues. Make sure the batteries are 12 volts.
Deprogramming may be the cause of your key fob not unlocking your car. This occurs when certain buttons send an alert to the onboard computer, asking that the key be removed from its list of keys.
Dead coin battery
If your C3's keys fob has stopped working the first thing to examine is whether the battery is dead. Fobs utilize small, coin-shaped batteries that can be replaced in just a few minutes. They can be found in general stores, home improvement stores, and auto parts stores. Make sure you buy the correct battery, however. Batteries for fobs are usually CR2025 or CR2032, however you should refer to the owner's manual of your vehicle to determine which kind of battery is needed.
Before you replace the battery, remove the button pad and rub it with cotton swabs or alcohol. These will help remove corrosion and clean the contacts which are typically colored gold. Once the contacts are cleaned, you are able to insert the new battery. Be cautious not to mix the two kinds as they have different voltages, sizes and diameters.
The next step is to test the battery's voltage. You can obtain a precise reading with a multimeter that is set to the battery voltage range. If the battery has an amount that is above or below its threshold, it needs to be replaced. You can also start your vehicle using a spare key. However, this may not always work. If the problem persists visit a CITROEN dealership with your V5 registration and identification documents. A CITROEN Dealer can retrieve the code of your vehicle's immobiliser and can order new batteries.
Water damage
If the key fob is underwater it may lose its signal to the car. If this happens, it's a great idea to get it out from the pool, puddle, or washing machine as fast as possible. Once you've done that, use an swab of cotton and isopropyl or electronic cleaner to clean the circuit board. If it's still not working, it may be time to get a new key fob.
Another common cause one of the main reasons for Citroen remote control c3 not working is signal interference. This can occur when there is a strong electrical field close to the vehicle or from other transmitters on the same frequency. Once you leave the area of interference your key fob will start working again.
The Citroen c3 key fob can not function due to worn buttons or signal interference, receiver module issues or a dead 12 volt battery, or a defective electronic chip. If this happens, you'll need to get it replaced by a skilled technician. This can be accomplished by a qualified mechanic, or a Citroen dealer. If the problem is severe it's time to have it replaced. This is a fairly easy and cost-effective fix, however it's crucial to act fast. If you put off fixing the issue, the worse it becomes. It could be dangerous for you and your passengers when the issue is not addressed.
Receiver module issue
If your key fob isn't functioning the receiver module could have developed an issue. This can be caused by many things such as water damage. This can happen when you lose your keys or wash them. You can try to solve the problem by removing your chip and cleaning it with isopropyl or electronic cleaner. This will prevent the chip from getting corroded.

You can also reset the receiver module when you disconnect it from the battery, and wait 10 seconds. Then, reconnect the battery 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 unable fix the problem, you can go to a dealer 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 right the receiver will not recognize the car key and display a message that reads "key not detected". This can be a frustrating issue especially when you attempt to start your vehicle.
internet is possible that your key fob has been damaged if it stops working after a change of batteries. This is particularly true in the event that the key fob was dropped or stepped upon, but it could also occur following servicing on your car which requires the removal and reinstallation of panels. Wires are exposed when these panels are removed. If your fob is damaged, you might require replacement completely.
Another possibility is that the remote is getting interference from other devices or locations. This can make RF signals weaker and prevent the car from recognizing the remote. You can reset your on-board computer if this is the situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining power and let the system start from scratch.
Before replacing the battery, it is essential to ensure it's of the correct size and type. The circuit board inside the key fob can be damaged in the event that the replacement battery is too large or has a different voltage. Before installing a battery, you must clean the chip of the fob to eliminate any harmful substances. The right battery type can ensure that the key fob is sealed and shielded from moisture. Once the key fob's been installed, it should work normally. It is possible to use the second key when your car displays a message that says "key is not recognized." It is possible to press the button a few times before it responds.