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Key Fob Replacement for the Seat Ibiza The facelifted fifth generation Ibiza is a contender in the crowded supermini segment. It competes against the Renault Clio, Peugeot 208 and Ford Fiesta. Use a small screwdriver or a thumbnail (A) to break open the battery compartment cover of the key fob (B). Replace the coin battery CR2025 by ensuring it is in the correct direction and in the right polarity. Dead Coin Battery The most common reason for a key fob that does not unlock or lock your car is due to a dead coin battery. It will usually show indications before it dies, such as a decreased range or no power at any time. It is simple to replace it with a new one (CR2025) from an area supermarket. Be aware that incorrect or defective batteries could cause damage to the key fob. Make sure that the new battery has the same size, specification and voltage as the old one. If your device was exposed to clean water, such as rain or soapy tap water it is likely that the chip inside has been damaged due to corrosion. You can clean the chip using isopropyl or electronic cleaners to see if this aids, but that the chip has been damaged. The most efficient solution is to get an entirely new key fob. They can be purchased from a variety of major dealerships and can be fitted by a professional mechanic. They can also be purchased online from places like ebay. The best thing to do is to work on a flat surface that has adequate lighting. It is much easier to work on small parts. This will also allow you to avoid putting something back into the wrong place. Always work on your key fob in an area that is safe and secure. Water Damage If your key fob gets 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. The issue begins when the circuit board in the fob is in contact with water. It creates a fantastic conductor and shorts out components. It also accelerates the process of rust and corrosion. Fortunately, this is not difficult to fix. Find something absorbent to put inside the fob. A tissue or paper towel would be ideal. Use a cotton swab with isopropyl to wash the circuit board as well as any other components. Let the circuit board dry for several days in a dry, warm environment. Replace the battery once the fob is dry with a fresh one that is the same size and polarity ('+' (pointing upwards). It can be difficult to open up the fob in order to access the battery, however if you have a small screwdriver that is flat at hand, it will slide in easily. After the fob is reassembled and working, it should operate as normal. If it isn't working then you might need to re-program it or replace the module. Radio Interference When a keyfob is working correctly, it emits the radio frequency which is received by a module in your car. If the signal is interrupted, your key fob will not function. This may be due to things, weather conditions or other transmitters operating on the same frequency band close to your vehicle. In this case it is recommended to replace the battery in your key fob. It is best to replace your key fob's battery. A few LED lights that are aftermarket and uses the same frequency as a remote key fob might interfere with the signal and stop it from reaching the receiver modules. The LED light must be switched off or changed to a different frequency to avoid interference. If you've just replaced the battery on your key fob but the issue persists, it's likely that the antenna on your key fob is damaged or inoperable. The antenna is responsible to transmit a signal between the key fob and the receiver module. A scan of the OBDII can assist in diagnosing the issue by telling you exactly what's wrong with your system. The scanner will ask for information about your vehicle including the make, model engine type, VIN number. Faulty Receiver Module The key fob contains the receiver module which transmits the signals for locking and unlock. If the receiver module is damaged and the on-board electronics will stop working. If this happens it is possible to reprogramme the module using an OBDII scanner or replacing the key fob may help. There are a few possibilities for the cause of this problem which could be due to an empty coin battery, water damage or signal interference. You can reset the on-board computer by disconnecting the 12 Volt batteries for 15 minutes. This will drain any residual electrical energy that could be causing problems. Remove the cable first from the negative terminal, then from the positive terminal. After 15 minutes, connect the battery in reverse order first, positive second. seat car key cover in the key fob may be damaged by dirt or water. If your key has stopped working after it got wet, wash the electronic component with isopropyl ethanol or an electronic cleaner prior to installing the battery. If it is not working after exposure to soapy or salty water the chip could be damaged and should be replaced. A defective fuse for the antenna module could be a cause. This is the fuse that sends a signal to the vehicle to lock or unlock. The fuse can be found in various places, based on the type of vehicle. For instance it could be located under the rear seat, or in the trunk, or the side of the dashboard.