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With a thumb nail or small screwdriver with a flat-headed head (A) to lift up the key fob compartment cover (B). Replace the coin battery CR2025, making sure it's in the correct direction and in the right polarity.

Dead Coin Battery

The most frequent reason for a key fob that does not unlock or lock your car is due to a dead coin battery. After it has died you will notice a decrease in range or no power. It is easy to replace it with a new (CR2025) one from a local retailer. Be aware that defective or defective batteries could cause damage to the key fob. Make sure that the new battery is the same size, specification and voltage as the previous one.

If your fob has been exposed to pure water, such as rainwater or soapy water from the tap, it is likely that corrosion has caused damage to the electronic chip. You could clean the chip with isopropyl or electronic cleaners to see if this helps, but it's likely that the chip is fried.

The most efficient solution is to buy an entirely new key fob. The majority of major car dealers sell them and they can be installed by a seasoned mechanic. You can also purchase them online, such as on eBay. The best method is to work on a flat surface with adequate lighting. This will make it easier to work on the small parts inside. This will also allow you to avoid placing anything back into the wrong place. Always work on the key fob in a secure and safe space.

Water Damage

You may think your key fob is damaged if you drop it into the water or accidentally wash it. But there's still hope. The problem begins when the circuit board inside the fob is in contact with water. It creates an excellent conductor and shorts components. It also accelerates the process of rust and corrosion.

Luckily, this is simple to fix. Find something absorbent to place inside the fob. A tissue or a paper towel will be ideal. Make use of a cotton swab and isopropyl to cleanse the circuit board, as well as any other components. Let the fob dry out for a few days in a dry, warm environment.

Once the fob is been drained it is time to replace the battery an alternative of the same size and polarity ('+' directed upwards). It isn't easy to open up the fob to get access to the battery, but if you have a small flat-head screwdriver that you have at hand, it will be able to insert easily. Once the fob has been put back together, it should work like a normal. If it doesn't, you might need to reprogram it or replace the receiver module.

Radio Interference

When a keyfob operates correctly, it emits the radio frequency which is received by a receiver module inside your vehicle. However, if the signal is interrupted in some way the key fob will not perform as it should. This could be due to objects or weather conditions, or other transmitters operating on the same frequency near your vehicle.

This can cause your key fob to not be able to activate the vehicle's functions like the ignition switch or security system. It is best to replace the battery in your key fob.

A few LED lights that are aftermarket and uses the same frequency as a remote key fob could interfere with the signal, preventing it from reaching the receiver modules. The LED lighting must be switched off or changed to a different frequency in order to keep out interference.

If the issue persists after installing a new battery, the antenna on your key fob may be damaged or malfunctioning. The antenna is responsible for transmitting signals between the key fob and the receiver module. A scan of the OBDII can help diagnose the problem by revealing what's wrong with the system. The scanner will request details about your particular vehicle, such as the make and model along with the engine type and VIN number.

Faulty Receiver Module

The key fob is equipped with an encoder module that transmits the signals for lock and unlock. All on-board electronic components will stop working if the receiver module is affected by a malfunction. If this happens, reprogramming with an OBDII scanner or replacing the key fob could assist.

There are several possible reasons for this problem such as a dead coin battery water damage, or signal interference. You can reset your on-board computer by disconnecting the 12 Volt batteries for 15 mins. This will remove any remaining electricity that may be causing issues. Take the cable off first of the negative terminal, then from the positive terminal. After 15 minutes, you can reconnect your battery in reverse order. First positive, then negative, and finally negative.

The internal chip of the key fob could be damaged by water or dirt. If your key stopped working after getting wet, wash the electronic component with isopropyl ethanol or an electronic cleaner prior to reinstalling the battery. If the key stops working after exposure to salted or soapy water, it is likely that the chip has become fried and needs to be replaced.

Another possibility is an inoperable antenna module fuse that sends the lock / unlock signal to the vehicle. Depending on your model, the fuse is located in a variety of locations, such as the engine bay, side of the dashboard, beneath the rear seat keys replacement, or trunk.