Citroen C3 Key Fob Troubleshooting
Key fobs from
citroen c4 replacement key can malfunction due to a number of causes. There are a variety of reasons, including worn buttons or poor contact with the battery, water damage, and receiver module issues. You should also examine the battery's 12 volts.

Deprogramming could be the reason the key fob's inability to unlocking your car. This happens 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 Citroen C3's key fob no longer works the first thing to look for is if the battery is dead. Fobs are small, coin-shaped batteries that can be replaced in just a few minutes. They are available at general stores, home improvement stores, as well as some auto parts stores. Make sure you purchase the right type. Fobs typically require CR2025 or CR2032, but you should consult your owner's manual to find out the specific type of battery that your car requires.
Before replacing the battery, remove the button pad and rub it with cotton swabs and alcohol. They will remove the corrosion and clean the contacts, which are typically colored gold. Once the contacts have been cleaned it is time to insert the new battery. 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. You can get a reliable reading using a multimeter, which is calibrated to the battery's voltage range. If the battery's reading 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 may not work in all situations. If the issue continues, go to an
citroen car key fob replacement dealership with your V5 registration number and personal identity documents. A
citroen car keys replacement Dealer can retrieve the code of your vehicle's immobiliser and can order an upgrade to your battery.
Water damage
When the key fob goes underwater, it may lose its signal to the car. It is recommended to remove it as soon as possible from the pool or puddle. After that dry the circuit board as best you can using a cotton swab dipped in isopropyl alcohol, or electronic cleaner. If it doesn't work it could be the time to replace your key fob.
Signal interference is another frequent reason for Citroen remote controls not working. This could happen if there is an electrical field in the vicinity of the car or other transmitters that operate on the same frequency. Once you have left the area of interference your key fob should start working again.
Lastly, the
citroen car key not working C3 key fob could be inoperable due to worn buttons, signal interference, receiver module issues or a dead 12 Volt battery, or a malfunctioning electronic chip. If this happens, you'll probably require it to be replaced by a skilled technician. This can be accomplished by a qualified mechanic or an Citroen dealer. If the problem is severe then you'll have to get it replaced. This is a simple and inexpensive fix, but it's essential to act quickly. The longer you delay fixing the issue, the more difficult it gets. If the problem isn't addressed the issue could be a hazard for the passengers and yourself.
Receiver module issue
If your key fob ceases working, it could be because the receiver module has developed a fault. It could be caused by a number of things that include water damage. This can happen if drop your keys, or wash them. You can try to fix the problem by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will help to stop the chip from corroding.
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, visit a dealership to get it replaced.
Interference can cause your key to stop working. This could be caused by other transmitters using the same frequency as your key fob, or by objects within your vehicle. If you're not able to fix the issue, you can take your key fob in to an authorized dealer and have it changed to a different frequency.
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 saying "key not recognized". This is a problem that can be frustrating, especially when trying to start your car.
Dead 12 volt battery
It is possible that your key fob has been damaged if it ceases to function after a change in batteries. This is more frequent in the event that your key fob has been thrown around or stepped on, but can also occur after a service that requires the removal of the panels and reinstallation. Wires are exposed when the panels are removed. If your fob is damaged, you might require a complete replacement car keys
citroen c4 grand picasso key picasso (
http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1801950).
Another possibility is that the fob receives interference from other devices or places. This can make the RF signals weaker and block the car from recognizing the remote. If this happens, you can reset all on-board computers by disconnection of the battery that is 12 volts for approximately 15 minutes. This will erase any remaining electrical energy, allowing the system to reboot.
Before replacing the battery, it's important to make sure it's of the correct size and type. The circuit board in the fob's key could be damaged in the event that the replacement battery is too big or has a different voltage. Before installing a battery you should clean the chip inside the fob to get rid of any contaminants that could cause corrosion. The proper type of battery will ensure that the key fob is properly sealed and protected against moisture. After the key fob has been put back in place, it should function normal. In most instances, you can use the second key to start your car, even when it displays the message "key is not detected." You may have to press the button several times before it responds.