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If the key fob on your C3 stopped functioning suddenly it could be due to a faulty receiver module. If the key fob still is working, it could be due to another issue, such as water damage or a dead battery.

Citroen hopes to meet the needs of the market of mass appeal with its eC3. It has a range of features, including virtual remote diagnostics as well as a specialized customer service application.

Dead coin battery

If the unlock button on the key fob does't function, it could be that the battery in the coin is not working properly. The battery should last between three and four years with regular usage however, it could die suddenly. Luckily, car makers have built-in fail-safes so that you can start and lock your car even if the key fob is dead battery.

The battery in the key fob is typically held in place by metal retaining clips that complete the circuit. The battery might not be able to run if these clips are worn or dirty. The battery should also be the correct size and type. The battery will not fit into the fob if it is too large or too small.

Key fob batteries are sold under many names including CR2016 and CR2032. These are not interchangeable. The best way to know the type to buy is to read the manual of your owner or look at the fob to find an inscription that gives you the specific details.

Once you have the right battery, you can replace it in just a few minutes. Most fobs come with a slider, switch, or gap that you can use to break open the cover to swap out the original battery for a new one. Ensure that the new battery has the same voltage as the old one and that it is inserted correctly.

Water damage

Even even if your key fob has survived the wash cycle or an immersion in the pool, water isn't ideal for electronics. It can damage the chip and destroy a battery. There are several things you can do to minimize the risk of damage.

It is essential to first get rid of the battery, and then dry the inside as much as you can. You can also employ a cotton swab coated in 90 percent isopropyl ethanol to cleanse the battery and circuit board.

After you've cleaned the key fob, wait a few days for it to completely dry out. You can accelerate the process by placing it on a shelf where it won't be disturbed. Once you're certain that the battery is dry, insert a new one and use it as normal.

If your key fob is still not working, it could be that the receiver module in your car is damaged and is unable to transmit signals. This can be quite expensive to fix, but it's definitely worth trying to avoid the expense of a replacement.

The most straightforward way to fix a broken key fob is to replace the battery. The radio signal will be restored and your key fob should function again after replacing the battery. If the issue persists then you should seek out professional assistance.

Faulty receiver module

In some cases, the key fob's receiver module could be defective that is preventing it from receiving or transmitting the correct signal. In this instance the car won't recognize the remote control key. It won't unlock or start. In this instance, a replacement remote control is required.

The steps to reprogram the key fob are different for each model and manufacturer, so consult your owner's manual before trying to do it yourself. Make sure that the battery of the key fob is in good condition and that all buttons function. You should also close the doors and remove any accessories like radios or alarm systems from the vehicle.

You can also try cleaning the chip with isopropyl alcohol or electronic cleaner. If the chip is fried it will likely need to be replaced.

After cleaning the key fob, take it off the circuit board. Then, clean the contacts with alcohol swabs, and let them dry. After the contacts have dried you can reassemble them and test the key fob. If the key fob still doesn't work, it could be necessary to replace the battery. Make sure you use the new battery with the same voltage as the previous one. It's also a good idea to ensure that the battery is installed correctly because the contact points are very sensitive.

A malfunctioning keyless entry system

It can be quite frustrating if the key fob stops functioning. The good news is that, most of the time it's simple to get it back in operation. A dead battery in the coin slot is the most frequent cause of a malfunctioning fob. This can be easily repaired in just a few minutes. Other reasons include signal interference or a damaged module, and other electrical issues.

The first step is to ensure that the battery is properly placed and has the proper voltage. It is also essential to select the correct battery type. The internal circuitry of the device can be damaged when you use the wrong battery, or one that isn't the proper size or is not polarized. Examine the fuses for damage or melted.

A transponder inside the key may be damaged or absent. This is a situation that will require further diagnosis by a dealer in the car or a professional mechanic.

Auto locksmiths and dealers will reprogram the fob of the key in the vehicle for a fee. However, this can be costly. If you have a spare, it could be worthwhile to try reprogramming the fob yourself. In most cases, you'll find instructions in your owner's guide. If you don't have the manual you can find the instructions online or on YouTube. It is important to consult the owner's manual prior attempting any repairs to the key fob.