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Key Fob Replacement for the Seat Ibiza This fifth-generation Ibiza, which has been redesignated and is a contender in the supermini segment. It competes against the Renault Clio and Peugeot 208 as well as the Ford Fiesta. Use a small flat-head screwdriver or a thumbnail (A) to open the battery compartment cover of the key fob (B). Replace the CR2025 battery, ensuring it is inserted in the correct direction. Dead Coin Battery A dead coin battery is the most common reason of a key fob not locking or unlocking your car. When it is dead, you will notice a decrease in range or no power. It is easy to replace it with a new (CR2025) one from a local retailer. You should be aware that using the wrong or non-compatible batteries could damage your key fob. Make sure that the new battery is identical in size, specifications and voltage as your old one. If your device was exposed to clean water like rain or soapy tap water, it is possible that the chip inside has been damaged due to corrosion. You can try cleaning the chip using isopropyl alcohol or an electronic cleaner to try to see if this helps but it is more likely that the chip has been fried. The simplest option is to buy an entirely new key fob. They can be purchased from a variety of major dealerships and can be installed by a qualified mechanic. They can also be purchased on ebay. It is best to work on a surface that is equipped with good lighting. This makes it easier to work on the smaller parts inside. This will also allow you to avoid placing anything back in the wrong spot. Always work on your key fob in an area that is secure and safe. Water Damage You may think that your key fob is lost if you drop it in the pool or accidentally wash it. But there's still hope. The problem is when the circuit board in the fob comes in contact with water – it creates a fantastic conductor and shorts out components. It also accelerates the process of rust and corrosion. Luckily, this is simple to fix. Simply find something absorbent and put it inside the fob – paper towl or tissue works well. Use a cotton swab soaked in isopropyl to cleanse the circuit board, as well as any other components. Let the circuit board dry for a few days in a dry, warm environment. Replace the battery after the fob has dried by replacing it with a new one that has the same dimensions and polarity ('+' (pointing upwards). The fob may be difficult to open to access the battery, however If you have a flat-head screwdriver in your toolbox it should be easy to slide in. Once the fob has been repaired, it should function in a normal manner. If it doesn't, you may need to reprogramme it or replace the receiver module. Radio Interference If a keyfob works properly, it transmits an audio frequency that is picked up by a receiver module in your car. However, if the signal is distorted in any way, your key fob won't function as expected. This could be due to things, weather conditions or other transmitters operating within the same frequency band near your car. In this instance it is recommended to replace the battery on your key fob. In this scenario, it would be best to replace the battery in your key fob. Some aftermarket LED lighting that utilizes the same frequency as a remote key fob could interfere with the signal, preventing it from reaching the receiver modules. To avoid interference, the LED lighting should be turned off or to another frequency. If you've just replaced the battery in your key fob, and the problem persists, it is possible that the key fob's antenna is damaged or has stopped working. The antenna is responsible for transmitting a signal between the key fob and the receiver module. An OBDII scan will help you identify the issue by revealing exactly what's wrong with your system. The scanner will ask you for information about your specific vehicle including the make and model, engine type, and VIN number. Faulty Receiver Module The key fob is equipped with a receiver module which transmits signals for locking and unlocking. If the receiver module is damaged, all of the on-board electronics will cease to function. If this is the case Reprogramming using an OBDII scanner or replacing the key fob itself may assist. There are several possible causes for this issue which could be due to a dead coin battery, water damage, or signal interference. You can reset the onboard computer by disconnecting the 12 volt batteries for about 15 minutes. This will drain any remaining power 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, then negative second. The internal chip in the key fob could be damaged by dirt or water. If your key fob stops working after getting wet, clean it using isopropyl or an electronic cleaner. Then reinstall the battery. If it stops working after exposure to soapy or salty water the chip could be damaged and needs to be replaced. Another possibility is a damaged antenna module fuse that transmits the lock / unlock signal to the vehicle. Depending on why not try this out , the fuse is located in a variety of locations such as the engine bay, the side of the dashboard, under the rear seat, or trunk.