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Key Fob Replacement for the Seat Ibiza This facelifted fifth-generation Ibiza is an attractive contender in the supermini segment. It is competing with the Renault Clio and Peugeot 208 as well as the Ford Fiesta. Use a small screwdriver or a thumbnail (A) to open the battery compartment cover on the key fob (B). Replace the CR2025 battery, making sure it is installed in the correct direction. Dead Coin Battery A dead coin battery is the most typical cause of a key fob that isn't locking or unlocking your vehicle. If it fails you will notice an increase in range or no power. It is simple to replace it with a brand new (CR2025) one from your local supermarket. Be aware that faulty or unsuitable batteries can damage the key fob. Make sure that the battery you purchase is identical in size, specifications and voltage as the older one. If your fob was exposed to clean water, for example rainwater or soapy tap water It is probable that corrosion has damaged the electronic chip. key seat could clean the chip with isopropyl or electronic cleaners to see if this aids, but the chip is fried. The simplest option is to buy a new key fob. They are available from most major car dealers and can be installed by a qualified mechanic. They can also be bought online from places like ebay. The best method is to work on a flat surface with good lighting. This makes it easier to work on the tiny parts inside. This will also help you to avoid placing anything back in the wrong place. Always keep the key fob in a secured and safe location. Water Damage If your key fob is damaged by dropping it in the pool or slipping it in the wash you might think it's a goner but there's still hope. When the circuit board on the fob is exposed to water, it turns into a conductor that shorts out the components. It also speeds up the process of corrosion and rust. This is a simple fix. Find something absorbent, and put it inside the fob. A paper towl or tissue can be used. Then, use a cotton swab that has been soaked in isopropyl alcohol to clean the circuit board as well as other components to eliminate any battery acid residue and contamination. Let the circuit board dry for some time in a dry, warm environment. Once the fob is been drained it is time to replace the battery another one of the same size and polarity ('+' with the upwards direction). The fob may be difficult to open to get to the battery, however If you have a flat-head screwdriver in your toolbox it should be easy to insert. After the fob is reassembled and working, it should operate as 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 working correctly, it sends the radio frequency signal which is received by the receiver module in your car. If the signal is interrupted, your key fob will not work. This could be due objects, weather conditions or other transmitters operating on the same frequency band near your vehicle. In this situation it is recommended to replace the battery in your key fob. It is best to replace the battery in your key fob. A few aftermarket LED lighting fixtures that utilizes the same frequency as a remote key fob can interfere with the signal, preventing it from reaching the receiver modules. The LED lighting must be turned off or switched to a different frequency to avoid interference. If you have a brand new battery in your key fob and the issue persists, it's possible that the antenna on your key fob is damaged or not functioning properly. The antenna is responsible to transmit 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 ask you to provide information about your vehicle including the model, make engine type, VIN number. Faulty Receiver Module The key fob is equipped with a receiver module which transmits signals for locking and unlocking. All electronic components on board will cease functioning if this component has a problem. If this happens, reprogramming with an OBDII scanner or replacing the key fob itself may help. This problem could be caused by a dead battery in the coin-cell either from water damage or signal interference. Try resetting the computer on board by disconnecting the 12 volt battery for 15 minutes. This will draw out any remaining electricity that could cause issues. Start by removing the cable from the negative terminal of the battery first, followed by the positive terminal. After 15 minutes, connect the battery in reverse order beginning with positive first, and negative second. Water or dirt can also affect the internal chip inside the key fob. If your key stopped working after being wet, wipe the electronic component with isopropyl alcohol or an electronic cleaner prior to installing the battery. If the key ceases to function after being exposed to soapy or salted water, it is likely that the chip has been damaged and must be replaced. A damaged antenna module fuse could also be the cause. This is the fuse that transmits an indication to the vehicle to lock or unlock. The fuse can be located in various places, based on the type of vehicle. For example it could be under the rear seat or trunk, or the side of the dashboard.