citroen car key battery replacement fills a niche in the market for people carriers. Its sliding rear door makes it easy to fit into bay parking spaces, and its tough cabin can withstand more abuse than many upmarket rivals.
If your key fob was submerged in soapy water or saltwater, it may not work for a second time, even after a brand new battery and reprogramming. This is because the internal chip has been damaged due to exposure to water.
Water Damage

Shake the key fob of yours to take out as much water as you can. Lay it flat with the button side down and let it dry for a few minutes as you wipe it clean using a cloth. This will stop any condensation from causing damage to your electronic chip.
If the warning light on your dashboard that looks like a vehicle with an image of a key illuminates on your Mk 2 or Mk 3 Citroen Berlingo then this could indicate an immobilizer problem. This is a security device in the vehicle that blocks thieves from installing hotwires. If this is the case, then you need to visit an Citroen dealer or a qualified mechanic to resolve the issue.
A constantly flashing engine warning light could indicate that the electric power assisted steering system is malfunctioning. If this is the case it is recommended to stop the vehicle and examine the temperature and pressure in the engine before restarting it. If the problem persists then you should visit a Citroen dealer or a trained mechanic to fix the problem.
Dead Battery
A dead battery for your coin is the most common reason for your key fob to not work in your Berlingo. The button cell in the key can be easily replaced, but it is important to select the correct voltage, size and type of battery. An uncompatible battery could damage the circuit board. A dead coin-cell can also disable the anti-theft feature. This is a security measure which prevents the engine from being started without a physical key.
If the key fob is still not responding to the lock button after replacing the battery, it could be an issue with the receiver module, which is not communicating with the other modules on your vehicle. A scanner for OBDII can detect this problem.
If the key fob still isn't responding, then you can try reprogramming the key fob. Follow the instructions in your owner's manual for this procedure. It should work once it has been changed.
Diagnostics of a fault
Citroen Berlingo owners are generally satisfied with the reliability of their vehicle. Like all vehicles, there are a few issues that can arise. A key fob that is dead is one of the most frequent issues. Fortunately, it is simple to determine and is easily replaced in a few minutes. Other problems that can arise are a worn button or a water damage to an electronic chip, signal interference or a remote keyless system receiver module that has developed an issue.
It is important to note that not all key fob batteries are to be the same. Some batteries are made of inferior materials that could damage your remote or other electronic components. Make sure to use only batteries of the same kind and voltage as the original when replacing the battery. Make sure the new battery fits correctly. When inserting the battery into the slot, ensure that the positive (+) face of the battery is facing upwards.
If you notice an exclamation point in the form of an oval on your dashboard, it is a sign that there is a problem with the vehicle's electric power-assisted driver. If the warning light is illuminated while driving, it is advised to seek help from a qualified mechanic or Citroen Berlingo (incl Multispace) dealership.
Radio Interference
Radio interference could be a cause your key fob's not working immediately. This is a common problem caused by devices that operate on the same frequency as your remote control. Certain wireless security devices, such as LED lights that are sold aftermarket, may interfere with the RF signal. If you own one of these devices at home, you can try moving them to another room to see if they help.
Environmental influences can also disrupt the key fob in a car and other devices that operate on the same frequency. Metal objects, for example can affect the strength of the signal. Weather conditions can also bend the antenna of the fob, resulting in a weaker radio signal. In some cases, even when the fob's location is close to the vehicle, it may not respond to radio signals.
To ensure that your key fob is functioning properly examine the battery. It should be in good condition and the contacts should be free of corrosion. A damaged or corroded connection is the primary reason the keyfob isn't responding to radio signals coming from a vehicle. A depleted battery can also cause the fob to malfunction. If the issue persists after replacing the battery the antenna may be malfunctioning. A locksmith can examine the keyfob, and make repairs.