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If your C3's keypad stopped working all of a sudden, it could be due to a faulty receiver module. If the key fob is still operational, the issue could be due to something else, such as water damage or a dead coin battery.

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Dead coin battery

If the key fob's unlock button isn't working, it could be a problem with the coin battery. The battery should last between three and four years with regular usage, but it can die suddenly. Fortunately, car manufacturers have built-in fail-safes to ensure that you can still unlock and start your car even if the citroen c2 key fob has a dead battery.

The battery inside the key fob is secured with metal clips that complete an electrical circuit. If they're worn or filthy, the battery might not receive the power. The battery must also be the right size and type. If the battery is too small or too large, it won't fit into the fob and will not work properly.

Key fob batteries are sold under many names such as CR2016, and even CR2032. These are not interchangeable. Read the owner's guide for your particular model or look for a label on the fob that contains the details.

When you have the proper battery, you can swap it in just a few minutes. Most fobs have a slider switch, or gap that can be used to pry open the cover to swap out the old battery for the new one. Make sure that the new battery is the same size and voltage, and that it is placed in the correct direction.

Water damage

Even even if your key-fob has survived the wash cycle or swimming in the pool, water isn't suitable for electronics. It can destroy the battery and cause severe damage to the electronic chip inside. There are a few steps you can do to minimize the damage.

It is important to first take out the battery, then dry out the interior as much as you can. You can also clean the battery by using a cotton swab, which has been dipped into 90-percent alcohol.

After you have cleaned the key fob, you need to let it dry for several days. You can accelerate the process by placing it on a shelf that isn't disturbed. Once you're certain that the battery is dry, replace it with an additional battery and continue using it in the same way as before.

If the key fob still doesn't work, you may have a faulty receiver module that isn't able to transmit signals to your vehicle. It's costly to repair, but it's worth it if you don't need to replace your car.

The easiest way to fix a damaged key fob is to replace the battery. The radio signal will be restored and your key fob will work again after changing the battery. However, if the problem persists you should seek assistance from a professional.

Faulty receiver module

In some instances an issue with the receiver module of the citroen xantia key fob may cause it to stop receiving or transmitting the correct signals. In this scenario the car won't recognize the remote control key. It won't unlock or start. In this situation the replacement remote control will be required.

The steps needed to reprogram keys differ based on model and make, so consult your owner's guide before trying to do it yourself. Make sure the battery of the key fob is in good working order and that all buttons function. Close the doors and remove any other devices from the aftermarket, such as alarms or radios out of the vehicle.

You can also clean the chip using isopropyl or electronic cleaner. If the chip has become damaged it is likely to need to be replaced.

After cleaning the key fob, remove the circuit board. Then, use alcohol swabs to clean the contacts and let them air dry. Once the contacts have dried, you can put them back together and test the key fob. If it's not working you may have to replace the battery. Make sure you use a new battery that provides the same voltage as the previous one. It is recommended to make sure the battery is in place in the first place, since the contact points can be very sensitive.

Keyless entry systems that aren't working properly

It can be frustrating when the key fob stops working. It's typically easy to get your key fob back up and running. The most typical cause of a malfunctioning key fob is a dead battery for the coin which can be replaced in minutes. Other causes include signal interference or a defective module, as well as other electrical issues.

The first step is to make sure that the battery is properly fitted and has the correct voltage. The correct type of battery is also important. Using a wrongly sized, or polarized battery can damage the internal circuitry. You should also examine the fuses to ensure they're not blown or melted.

A transponder in the key could be damaged or missing. This is a scenario that requires further examination by a car dealer or a professional mechanic.

Auto locksmiths and dealers can reprogram the key fob of an automobile for a cost. However, this can be costly. It could be worthwhile to reprogram your spare fob if you own one. In most cases, it is possible to find instructions in the owner's manual. If you don't have the manual, you can look up instructions online or on YouTube. It is imperative to check the owner's manual prior to making any repairs to the key fob.