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Make use of a small screwdriver with a flat head or a thumbnail (A) to open the battery compartment cover on the key fob (B). Replace the CR2025 coin battery, making sure it's in the proper direction and polarity.

Dead Coin Battery

A dead battery on a coin is the most typical cause of a key fob that isn't locking or unlocking your vehicle. It usually shows indications before it dies, such as a decreased range or no power at any time. It is simple to replace with a new one (CR2025) from the local supermarket. Be aware that using the wrong or incompatible batteries can cause damage to your key fob. Make sure that the new battery is identical in size, specifications 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 possible that corrosion has damaged the electronic chip. You can clean the chip using isopropyl or electronic cleaners to determine if that helps, but that the chip has been damaged.

The most simple solution is to purchase an entirely new key fob. They are available from most major dealerships and can be installed by a qualified mechanic. They can also be purchased on the internet through sites like ebay. It is recommended to work on a work surface that has adequate lighting. It is easier to work with the small parts. This will also allow you to avoid placing anything back in the wrong location. Always keep the key fob in a secure and safe area.

Water Damage

If your fob's key gets damaged by dropping it in the pool or fumbling it in the washing machine you might think that it's gone but there's still hope. The issue begins when the circuit board within the fob comes in contact with water - it makes an excellent conductor and cuts off 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 paper towel or tissue will be a good choice. Use a cotton swab with isopropyl for cleaning the circuit board as well as any other components. Let the circuit board dry for a few days in a warm and dry environment.

Replace the battery when the fob has dried by a new one with the same dimensions and the same polarity ('+' (pointing upwards). The fob isn't easy to open to get to the battery, however when you have a flat head screwdriver on hand, it should be easy to slide in. After the fob is reassembled it should function as normal. If it doesn't work, you'll need to reprogram it or replace the receiver module.

Radio Interference

If a keyfob works properly, it broadcasts an audio frequency that is picked up by a receiver module in your car. If the signal is disrupted, your key fob will not function. This can be caused by objects like weather conditions or other transmitters operating on the same frequency near your car.

In this instance, it is best to replace the battery on your key fob. It is recommended to replace the battery on your key fob.

Some LED lighting aftermarket that uses the same frequencies as a seat key fob for remote control may interfere with the signal, preventing it from reaching receiver modules. The LED lighting must be turned off or switched to a different frequency in order to keep out interference.

If the issue is still present after replacing the battery, the antenna on the key fob might be damaged or inoperable. The antenna is responsible to transmit a signal between the key fob and the receiver module. The OBDII scanner is able to assist in diagnosing the problem by revealing what's wrong with the system. The scanner will request details about your particular vehicle, such as the model and make along with the engine type and VIN number.

Faulty Receiver Module

The key fob comes with a receiver module which transmits signals for locking and unlocking. If this module develops a fault that causes it to fail, the entire onboard electronics will cease to function. If this happens, reprogramming with an OBDII scanner or replacing the key fob could help.

This problem can be caused by a dead coin-cell or a water damage or signal interference. You can reset the on-board computer if you disconnect the 12 volt batteries for 15 minutes. This will drain any remaining electricity that could be causing issues. Begin by removing your cable from the negative terminal of the battery first, followed by the positive terminal. After 15 minutes, connect your battery in reverse order. First positive, then negative second.

The internal chip of the key fob could be damaged by water or dirt. If your key has stopped working after getting wet, clean the electronic component with isopropyl ethanol or an electronic cleaner prior to reinstalling the battery. If the key ceases to function after being exposed to salted or soapy water, it's likely that the chip has become damaged and must be replaced.

A damaged antenna module fuse could be a cause. It's the fuse that sends an electronic signal to the vehicle to lock or unlock. Based on the model you have the fuse can be located in one of several locations, such as the engine bay, on the side of the dashboard, under the rear seat leon replacement key, or trunk.