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Key Fob Replacement for the Seat Ibiza This fifth-generation Ibiza that has been redesignated, is a contender for the supermini segment. It competes 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 by ensuring it's in the correct direction and polarity. Dead Coin Battery A dead battery on a coin is the most common reason of a key fob not locking or unlocking your car. It will usually show symptoms before it dies like a decrease in range or no power at all. It is easy to replace it with a new (CR2025) one from your local supermarket. Be aware that incorrect or defective batteries could damage the key fob. Make sure the battery you replace is the same size and voltage, as well as the same specification. If your fob has been exposed to clean water, such as rainwater or soapy water from the tap it is possible that corrosion has damaged the chip's electronic components. You can clean the chip using isopropyl or electronic cleaners to determine if that helps, but it's likely that the chip has been damaged. The most straightforward solution is to purchase a new key fob. They are available at most major car dealers and are installed by a qualified mechanic. They can also be bought on the internet from sites like ebay. The best method is to work on a flat surface with adequate lighting. It is easier to work with small pieces. This will also allow you to avoid placing anything back in the wrong place. Always work on your key fob in a location that is safe and secure. Water Damage If your fob's key gets soaked by dropping it in the pool or throwing it in the wash you might think it's over, but there's hope. If seat spare key G28 inside the fob is exposed to water, it becomes a conductor which shorts the 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 paper towel would work. Use a cotton swab soaked in isopropyl to clean the circuit board and any other components. Let the fob air dry in a dry, warm environment for several weeks. Replace the battery after the fob is dry with a new one that is the same dimensions and polarity ('+' (pointing upwards). The fob isn't easy to open to access the battery, but If you have a flat-head screwdriver on hand it will be a breeze to insert. Once the fob has been reassembled it should function like a normal. If it doesn't work it may be necessary to program it again or replace the module. Radio Interference If a key fob is functioning properly, it sends a radio frequency signal, which is received by the receiver module in your car. If the signal is interrupted in any way the key fob won't function as expected. This could be caused by factors like weather conditions, objects, or other transmitters operating on the same frequency band near your vehicle. This can cause your key fob to not be able to activate the vehicle's functions for example, the ignition switch or the security system. In this situation it is best to replace the battery in your key fob. A few LED lighting products that uses the same frequencies as a key fob for remote control could interfere with the signal, stopping it from reaching receiver modules. To prevent interference, the LED lighting must be turned off, or switched to an alternative frequency. If the problem persists after replacing the battery, the antenna on your key fob may be damaged or malfunctioning. This is since the antenna is responsible for sending an indication from the key fob to the receiver module. The OBDII scanner is able to help diagnose this issue by revealing what's wrong with the system. The scanner will ask for information about your vehicle including the make, model and engine type as well as the VIN number. Faulty Receiver Module The key fob is equipped with a receiver module that transmits the signals to lock and unlock. If the receiver module is damaged and the on-board electronic components will stop functioning. If this is the case Reprogramming using an OBDII scanner or replacing the key fob itself could assist. This issue can be caused by a dead coin-cell battery, water damage or signal interference. It is possible to reset the on-board computer if you disconnect the 12 volt batteries for 15 minutes. This will remove any remaining electrical energy that could be causing issues. Take the cable off first of the negative terminal, then the positive terminal. After 15 minutes, connect the battery in reverse order first, positive second. Dirt or water can affect the internal chip inside the key fob. If your key quit working after being wet, clean the electronic component using isopropyl alcohol or an electronic cleaner prior to installing the battery. If it stopped working after exposure to salty or soapy water the chip is likely damaged and should be replaced. A faulty antenna module fuse may also be the cause. This is the fuse that transmits an electronic signal to the vehicle to lock or unlock. The fuse can be found in several places, depending on the type of vehicle. For example it could be located under the rear seat, or in the trunk, or the side of the dashboard.