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Key Fob Replacement for the Seat Ibiza This fifth-generation Ibiza is redesignated, is a contender for the supermini segment. It goes toe-to-toe with the Renault Clio, Peugeot 208 and Ford Fiesta. Make use of a small screwdriver with a flat head or a thumbnail (A) to remove the battery compartment cover on the key fob (B). Replace the CR2025 battery and ensure that it is inserted in the correct direction. Dead Coin Battery A dead battery on a coin is the most common cause of a key fob that isn't locking or unlocking your car. When it is dead you'll see an increase in range or no power. It is simple to replace with a brand new one (CR2025) from a local supermarket. Be aware that incorrect or unsuitable batteries may damage the key fob. Make sure that the new battery is identical in size, specifications and voltage as the older one. If your fob has been exposed to clean water, such as rainwater or soapy tap water it is possible that corrosion has caused damage to the chip's electronic components. You might try cleaning your chip with alcohol or an electronic cleaner to see if it helps but it is more likely that the chip has been fried. The most simple solution is to get an entirely new key fob. They are available at most major car dealers and are fitted by a skilled mechanic. They can also be purchased on ebay. It is best to work on a surface that is equipped with good lighting. It is easier to work with small parts. This can also help to avoid putting something back into the wrong place. Always keep the key fob in a secured and safe location. Water Damage You might think that your key fob is ruined if you drop it in a pool or accidentally wash it. There's a chance. The problem is when the circuit board inside the fob comes into contact with water. It is a great conductor and cuts off components. It also speeds up corrosion and rust. Luckily, this is a simple issue to fix. Find something absorbent to place inside the fob. A paper towel or tissue will be a good choice. Then, use a cotton swab dipped in isopropyl alcohol and wipe down the circuit board and other components to get rid of any residues of acid from batteries and contamination. Let the fob air dry in a dry, warm environment for a few weeks. After the fob has been drained then replace the battery with a new one (of the same size and polarity ('+' that is pointing upwards). The fob can be difficult opening to access the battery, but if you keep a flat-head screwdriver it will be a breeze to insert. Once the fob has been put back together, it should work in a normal manner. If it doesn't work, you'll require reprogramming it or replace the receiver module. Radio Interference If a key fob is functioning properly, it emits a radio frequency signal that is received by the receiver module inside your car. If the signal is interrupted, your key fob will not function. This could be due to objects such as weather conditions, objects, or other transmitters operating on the same frequency near your car. In this instance it is best to replace the battery in your key fob. In this scenario it's best to replace the battery on your key fob. Some aftermarket LED lighting that uses the same frequency as a remote key fob can interfere with the signal and stop it from reaching the receiver modules. To prevent interference, the lighting must be turned off, or to a different frequency. If you've just replaced the battery on your key fob but the issue persists, it is possible that the antenna on your key fob is damaged or has stopped working. This is crucial since the antenna is responsible for transmitting a signal from the key fob to the receiver module. Using an OBDII scanner can help diagnose this issue by telling you what is wrong with the system. The scanner will ask to provide information about your vehicle, including the make, model engine type, VIN number. Faulty Receiver Module The key fob houses an electronic receiver that sends the signals for lock and unlock. G28 Car Keys on-board electronic components will cease functioning if this component is affected by a malfunction. If this happens, reprogramming with an OBDII scanner or replacing the key fob may assist. There are a number of possible causes for this issue that could be the cause, such as an empty coin battery, water damage or signal interference. You can reset the on-board computer by disconnecting the 12 volt batteries for about 15 minutes. This will flush out any residual power that may be causing problems. The cable should be removed first from the negative terminal, then from the positive terminal. After 15 minutes, connect the battery in reverse order first, positive second. The presence of dirt or water could damage the internal chip of the key fob. If your key stopped working when it was wet, wipe the electronic component with isopropyl alcohol or an electronic cleaner prior to reinstalling the battery. If it is not working after exposure to soapy or salty water the chip could be damaged and must be replaced. Another possibility is an inoperable antenna module fuse that sends the lock and unlock signal to the vehicle. Depending on the model the fuse could be located in a variety of locations such as the engine bay, to the left of the dashboard, under the rear seat, or trunk.