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Key Fob Replacement for the Seat Ibiza This fifth-generation Ibiza, which has been updated and is a contender in the supermini segment. It goes toe-to-toe with the Renault Clio, Peugeot 208 and Ford Fiesta. Use a small flat-head screwdriver or a thumbnail (A) to pry up the battery compartment cover of the key fob (B). Replace the CR2025 coin battery, making sure it is fitted in the correct direction and in the right polarity. Dead Coin Battery The most frequent reason for a key fob to not allow you to lock or unlock your vehicle is a dead coin battery. Before it dies you'll see an increase in range, or no power. It is easy to replace it with a new one (CR2025) from an area supermarket. Be aware that incorrect or defective batteries could damage the key fob. Make sure that the battery you choose to replace is the same size and voltage as well as the same specification. If your fob has been exposed to pure water, such as rainwater or soapy tap water It is probable that corrosion has caused damage to the electronic chip. You can try cleaning the chip using isopropyl alcohol or an electronic cleaner to try to see if this helps but it is likely that the chip has been damaged and fried. A new key fob is a simple solution. They are readily available from major car dealers and are installed by a qualified mechanic. They can also be bought online from places like ebay. It is best to work on a work surface that has good lighting. It makes it easier to work with the small parts. It also allows you to avoid putting things in the wrong place. Always keep the key fob in a secure and safe location. Water Damage If your key fob is submerged after dropping it into the pool or by slipping it in the wash you might think that it's lost but there's a chance. The problem begins when the circuit board inside the fob is in contact with water – it is a great conductor and shorts out components. It also increases corrosion and rust. Luckily, this is simple to fix. Find something absorbent to place inside the fob. A tissue or a paper towel will work. Use a cotton swab soaked in isopropyl to cleanse the circuit board, and any other components. Let the fob air dry in a dry, warm environment for several weeks. Replace the battery when the fob has dried by a new one that is the same dimensions and the same polarity ('+' (pointing upwards). The fob isn't easy to open to access the battery, however when you have a flat head screwdriver at hand it should be easy to insert. Once the fob is assembled it should function as normal. If it does not work it may be necessary to re-program it or replace the module. G28 When a keyfob is working correctly, it emits a radio signal that is received by a receiver module inside your car. However, if the signal is distorted in some way the key fob won't perform as it should. This could be due objects, weather conditions or other transmitters operating in the same frequency range near your car. This can cause your key fob not to be able to trigger the car's systems like the ignition switch or the security system. It is best to replace the battery of your key fob. Some LED lighting from the aftermarket that utilizes the same frequency as a remote key fob might interfere with the signal and prevent it from reaching the receiver modules. The LED light must be switched off or changed to a different frequency to be able to avoid interference. If you have a brand new battery in your key fob and the problem persists, it's possible that the key fob's antenna is damaged or inoperable. This is important because the antenna is responsible for sending a signal from the key fob to the receiver module. An OBDII scan can help diagnose the problem by revealing what's wrong with your system. The scanner will request details about the vehicle you own, such as the make and model, engine type, and VIN number. Faulty Receiver Module The key fob is equipped with an electronic receiver that sends the signals to lock and unlock. The electronic components on the board will cease to function if this module has a problem. If this happens Reprogramming using an OBDII scanner or replacing the key fob could aid. There are a variety of possible causes which could be due to an empty coin battery, water damage or signal interference. Try resetting the on-board computer by disconnecting the battery 12 volts for 15 minutes. This will remove any remaining electricity that could be causing problems. 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 and then negative, and finally negative. Dirt or water can cause damage to the internal chip of the key fob. If your key's function stopped when it was wet, wash the electronic component with isopropyl Alcohol or an electronics cleaner before installing the battery. If your key has stopped working after exposure to salted or soapy water, it's likely that the chip has been damaged and must be replaced. Another possibility is a defective antenna module fuse that sends the signal to lock or unlock to the vehicle. Depending on the model the fuse can be located in one of the many locations, such as the engine bay, the side of the dashboard, beneath the rear seat, or trunk.