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If your C3’s keypad stopped functioning suddenly it could be due to a faulty receiver module. If the key fob still works, it could be because of something else, like water damage or a dead battery.
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Dead coin battery
If the key fob’s unlock button is not working, there may be a problem with the coin battery. The battery is expected to last between three and four years with regular usage, but it can die abruptly. Fortunately, most car manufacturers have built-in fail-safes that ensure you are able to start and lock your vehicle even if the key fob is dead battery.
The battery inside the key fob is held in place by metal clips that form an electrical circuit. If the clips are worn or dirty, the battery may not receive electricity. The battery must be of the correct size and type. The battery will not fit into the fob if it’s too big or too small.
Key fob batteries are commonly sold under different names, such as CR2016 and CR2032 (though they’re not interchangeable). The best way to know which type to purchase is to refer to your owner’s manual or look at the fob for the label that provides the exact details.
Once you’ve got the right battery you can replace it in a matter of seconds. Most fobs have a slider switch, or gap that can be used to pry open the cover and exchange the original battery for the new one. Ensure that the new battery has the same voltage as the previous one and is inserted correctly.
Water damage
Water is bad for electronics even if they’ve been through an wash cycle or dip. It can damage the chip and ruin a battery. There are, however, some things you can do to minimize the damage.
It is essential to first get rid of the battery and then dry out the interior as much as you can. You can also make use of a cotton swab, coated in 90 percent isopropyl ethanol to cleanse the battery and circuit board.
After cleaning the key fob you need to let it dry for several days. You can accelerate the process by placing it on a shelf where it will not be disturbed. When you’re sure the battery is completely dry, replace it with another battery and use it in the same way as before.
If your key fob is not working, it could be that the receiver module in your car is damaged and cannot transmit signals. It’s costly to fix, but it’s worth it if your goal isn’t to replace your vehicle.
The simplest solution to fix a broken key fob, is to replace the battery. The radio signal will be restored and your key fob will be operational again after changing the battery. If the issue continues, you should seek professional assistance.
The receiver module is not working properly.
In certain situations the key fob’s reception module may be affected by a fault that stops it from receiving and transmitting the correct signal. If this is the case, your car won’t recognize your remote control and will refuse to unlock or start the engine. In this instance you’ll have to purchase a new one.
Refer to the owner’s manual prior to trying to reprogram the key fob on your own. Check that the battery on the key fob is in good working order and that all buttons function. Close the doors and take out any accessories, such as alarms or radios out of the vehicle.
You might also try cleaning your chip with isopropyl alcohol or electronic cleaner. If the chip has become damaged, you’ll need to replace it.
After you’ve cleaned your key fob, take it off its circuit board. Clean the contacts using alcohol swabs and let them dry. Once the contacts are dry you can put them back together key fob and test it. If it still doesn’t work you might need to replace the battery. Use a battery that has the same voltage as the old battery. Verify the battery’s position as the contact points are extremely sensitive.
Faulty keyless entry systems
It can be a hassle when the key fob stops functioning. The good news is that most of the time, it’s easy to get it back in operation. The most common cause of a malfunctioning key fob is a dead battery for the coin which can be replaced in a matter of minutes. Other causes include signal interference or a malfunctioning module and other electrical issues.
The first thing to do is to ensure that the battery is running at the right voltage and is correctly placed. The correct type of battery is also important. Using a wrongly sized, or polarized one could cause damage to the internal circuitry. You should also examine the fuses to ensure they are not blown or melted.
The transponder within the key could be damaged or missing. This is a problem that will require further diagnostics by a car dealer or a professional mechanic.
Many auto locksmiths and dealerships can reprogram the key fob of a car at a cost, but this can be expensive. It could be worthwhile to reprogram your spare fob in case you have one. You can usually find instructions in the owner’s manual. If you don’t have the manual, you can locate instructions online or on YouTube. It is crucial to check the owner’s manual prior to making any repairs on the key fob.