Citroen C4 Key Fob Replacement
The Citroen C4 Picasso is a compact SUV that's small for a family vehicle, but has some genuinely innovative features. It's spacious enough to accommodate five people and is a great way to get around the city.
Sometimes, a keyfob may not work due to pairing problems. If you follow the directions correctly, this problem can be fixed quickly. However, a professional equipped with specialized equipment is needed for certain makes of vehicles.
Dead coin battery
The most common problem with remote key fobs is an inactive battery. It's an easy fix however. You only need to replace the battery with a coin size. They are available at your local auto store and look like small silver coins. Once you have replaced the battery, then you'll be able to lock and unlock your car.
Interference is another reason your key fob won't work. This can occur due to many factors, such as weather conditions, objects or other transmitters operating on the same frequency. If this happens, it may be necessary for you to unplug the ignition key and try again.
Another reason why your key fob might not work may be that it has been deprogrammed. This could happen if the key is exposed to water, or if it isn't removed correctly after replacing the battery. Usually, you can re-set the program of your car by following the guidelines provided in the owner's guide. If you are unable to accomplish this, you may ask a professional locksmith or dealer to assist you.
Water damage
The Citroen C4 is a highly reliable car, however it's a machine with hundreds of interconnected parts. Like any other car it is likely to experience occasional breakdowns from time occasion. In some cases it is easy to get the issue fixed. In some instances, you may need to contact assistance or visit an expert. The most frequent causes of the C4 key fob not working is the battery being dead, water damages, signal interference and receiver module issues.
Sweat or moisture on the circuit board of the key fob could cause water damage. This could cause the circuit to become shorted, which can lead to the battery draining or even a dead key fob. To prevent G28 from happening, try to keep your key fob safe from the water or put it in a plastic bag before using it.
You can also test the voltage of your battery by using a multimeter. A successful test will reveal values between 12 and 13. If your battery doesn't produce these values, it may be defective. This means you'll require replacing the battery.
The receiver module is not working properly.
A faulty receiver module can cause the key fob to stop working. This is a common issue for Citroen owners, since the key fob must send a signal through the door handle to allow the door to be opened and start the car. The key fob won't work if it fails to transmit the signal. It needs to be replaced. This can be done at a dealer for cars or by an experienced mechanic.
There are several different issues that could happen with your Citroen C4 key fob. It could be due to an empty coin-cell battery, damage to the signal or water. The first step to troubleshoot is to test the key fob's batteries and look for obvious indications of damage. This can be done by opening the keyfob and removing its battery to get a better view.
Replace the battery if it has depleted. Make sure that the new battery has the same size, voltage, and specification. Also, ensure that the fob is fully snapped together before replacing it.

Faulty 12 Volt Battery
Most modern cars come with key fobs that allow you to lock and unlock the vehicle from some distance. These devices send a signal the car to control the locks and run on battery power. However, batteries can fail over time. The good part is that the replacement battery is cheap and easy to replace. You can use a screwdriver with a flat blade to break the fob or your owner's manual may contain instructions on how to do it.
Replace the battery with a battery of the same size and type as the original. Different kinds of batteries have different voltages, which could cause the fob to cease working or display a low battery alert. Also, make sure to position the battery in a way that the plus and minus signs are in the same direction as the original. This will ensure that the chip is receiving the proper signals. Alternatively, the problem may be due to a malfunctioning receiver module. In this instance you should consult your dealer for further diagnostics and repairs.
Unpaired key that requires the reprogramming
The remote for your car's key can stop working due to several reasons. Fortunately, the majority of these issues can be fixed quickly and easily. The most frequent cause is an old coin battery, which can be replaced in a couple of minutes at most auto parts stores. However, it's important to ensure that the new battery is correctly installed. Metal retaining clips must be properly tightened and the contacts of the battery should be cleaned.
A defective receiver module or signal interference, is a different possibility. If the key fob isn't receiving a sufficient signal from the receiver, it may not lock or unlock doors as well as start the car or operate the hands-free feature. In these instances you can reset the receiver by disconnection of the battery for a couple of minutes.
Smart keys are more expensive and could cost up to $500 to replace. They have a security chip that disables the immobiliser on your vehicle. To avoid these high costs, it's a good idea to have at minimum two keys that work for your C4. The replacement remote key fob has been repaired and tested using new internal components before being sent to you.