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Key Fob Replacement for the Seat Ibiza This fifth-generation Ibiza that has been updated and is a contender in the supermini segment. It competes against the Renault Clio, Peugeot 208 and Ford Fiesta. With a thumb nail, or a small flat head screwdriver (A), prise upwards the key fob battery compartment cover (B). Replace the coin battery CR2025 and ensure it is in the correct direction and polarity. Dead Coin Battery The most common reason for a key fob to not unlock or lock your vehicle is a dead coin battery. After it has died you will see a decrease in range or no power. It is easy to replace it with a brand new (CR2025) one from your local supermarket. Be aware that faulty or defective batteries could damage the key fob. Make sure that the replacement battery is the same size and voltage and also the same specification. If your device 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 try cleaning the chip with isopropyl alcohol or an electronic cleaner to see if it helps but it is likely that the chip has fried. The most simple solution is to get a new key fob. Most major car dealers offer them and they can be installed by an experienced mechanic. You can also purchase them on the internet, for instance on eBay. It is recommended to work on a work surface that has good lighting. This will make it easier to work on small parts inside. You'll also be able to avoid putting something in the wrong place. Always keep your key fob in an area that is secure and safe. Water Damage If your fob's key gets wet from dropping it into the pool or slipping it in the washing machine, you may think it's a goner but there's a chance. The problem begins when the circuit board in the fob comes into contact with water – it is a great conductor and cuts off components. It also accelerates corrosion and rust. Fortunately, this is not difficult to fix. Find something absorbent to place inside the fob. A tissue or a paper towel will work. Use a cotton swab with isopropyl to clean the circuit board as well as any other components. Allow the circuit board to air dry in a dry, warm environment for several weeks. Replace the battery when the fob is dry by replacing it with a new one that has the same size and polarity ('+' (pointing upwards). It can be tricky to open the fob to get access to the battery but if you have a small screwdriver with a flat head available, it should be able to slide into easily. Once the fob is reassembled it should function just as normal. If it doesn't, then you'll need to reprogramme it or replace the receiver module. Radio Interference If a key-fob is functioning properly, it emits the radio frequency signal which is picked up by the receiver module in your car. If the signal is not received, your key fob will not function. This could be caused by things, weather conditions or other transmitters operating in the same frequency range near your vehicle. In this situation it is best to replace the battery in your key fob. In this instance it's best to replace the battery inside your key fob. Some LED lighting aftermarket that utilizes the same frequency as a remote control key fob may interfere with the signal, stopping it from reaching receiver modules. To prevent interference, the LED light must be turned off, or switched to the opposite frequency. If the problem persists after replacing the battery, the antenna of your key fob could be damaged or malfunctioning. The antenna is responsible for transmitting a signal between the key fob and the receiver module. The OBDII scanner is able to aid in diagnosing the issue by revealing what's wrong with the system. The scanner will request details about your particular vehicle like the make and model as well as the engine type and VIN number. Faulty Receiver Module The key fob contains a receiver module that transmits the signals to lock and unlock. The electronic components on the board will stop working if the receiver module has a problem. Reprogramming the key fob using an OBDII scan or replacing it may help. There are a few possible causes such as a dead coin battery, water damage or signal interference. You can reset the on-board computer if you disconnect the 12 volt batteries for about 15 minutes. This will remove any remaining electrical energy that could be causing problems. Start by removing the cable from the negative terminal first, followed by the positive terminal. After 15 minutes, connect your battery in reverse order. First, positive and then negative next. The internal chip inside the key fob can be damaged by water or dirt. If the key fob you purchased stopped working after getting wet, wipe it with isopropyl or electronic cleaner. Then, reinstall the battery. If the key ceases to function after exposure to salted or soapy water, it is likely that the chip is damaged and must be replaced. Another possibility is a defective antenna module fuse that sends the lock and unlock signal to the vehicle. seat car key cover can be located in a variety of places, based on the type of vehicle. For instance it could be beneath the rear seat, or in the trunk, or the side of the dashboard.