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Key Fob Replacement for the Seat Ibiza The fifth-generation Ibiza, which has been revamped is a contender for the supermini segment. It is competing with the Renault Clio and Peugeot 208 as well as the Ford Fiesta. Make use of a small screwdriver with a flat head or a thumbnail (A) to pry up the battery compartment cover on the key fob (B). Replace the coin battery CR2025 by ensuring it's in the correct direction and polarity. Dead Coin Battery The most common reason for a key fob to not be able to lock or unlock your car is a dead coin battery. If it fails you'll notice an increase in range or no power. It is easy to replace with a new one (CR2025) from a local store. Be aware that faulty or unsuitable batteries can damage the key fob. Be sure that the battery you choose to replace is the same size and voltage, as well as the same specifications. If your device was exposed to clean water, such as rain or soapy tap water it is likely that the electronic chip inside has been damaged by corrosion. You could try cleaning the chip with isopropyl alcohol or an electronic cleaner to test if it helps, but it is more likely that the chip is damaged. The most straightforward solution is to get a new key fob. Most major car dealers sell keys and can be installed by a seasoned mechanic. They can also be bought on ebay. It is best to work on a surface with adequate lighting. It is easier to work with small parts. It also allows you to avoid putting things in the wrong spot. Always work on the key fob in a secured and safe place. Water Damage You might think that your key fob is damaged if you drop it in a pool or accidentally wash it. But there's a way to salvage it. When the circuit board in the fob is exposed to water, it becomes a conductor which shorts the components. It also speeds up the process of corrosion and rust. This is a simple solution. Find something absorbent and put it inside the fob. A paper towl or tissue works well. Then, use the cotton swab, dipped in isopropyl alcohol to wipe down the circuit board as well as other components to eliminate any battery acid residue or contamination. Allow the circuit board to air dry in a dry, warm environment for several weeks. Replace the battery after the fob has dried out with a fresh one that is the same size and the same polarity ('+' (pointing upwards). The fob may be difficult opening to access the battery, but If you have a flat-head screwdriver in your toolbox it should be easy to slide in. Once the fob is assembled it should function just as normal. If it doesn't, then you'll require reprogramming it or replace the receiver module. Radio Interference When a keyfob is working correctly, it emits the radio frequency which is absorbed by a receiver module inside your vehicle. If the signal is not received, your key fob will not work. This may be due to things, weather conditions or other transmitters operating on the same frequency band near your vehicle. This could cause your key fob to not activate the car's systems like the ignition switch, or the security system. In this case it is recommended to replace the battery inside your key fob. Some LED lighting aftermarket that utilizes the same frequencies as a remote control key fob can interfere with the signal, stopping it from reaching receiver modules. To avoid interference, the LED light must be turned off or switched to an alternative frequency. If the problem persists after replacing the battery, the antenna of your key fob could be damaged or not functioning properly. This is important since the antenna is responsible for sending an indication from the key fob to the receiver module. An OBDII scan will help diagnose the problem by revealing exactly what's wrong with your system. The scanner will ask to provide 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 an encoder module that transmits the signals for locking and unlock. If the receiver module develops a fault then all the on-board electronics will cease to function. Reprogramming the key fob using an OBDII scan, or replacing it may help. There are several possible causes 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 draw out any remaining electricity that may be causing issues. Take the cable off first of the negative terminal, then from the positive terminal. After 15 minutes, you can reconnect your battery in reverse order. First, positive, then negative next. The internal chip inside the key fob may be damaged by water or dirt. If great site working after being wet, wash it with isopropyl or electronic cleaner. Then, you can reinstall the battery. If it stopped working after exposure to soapy or salty water the chip may be damaged and must be replaced. A damaged antenna module fuse could also be the reason. It is the fuse that sends an electronic signal to the vehicle to lock or unlock. The fuse can be located in a variety of locations, based on the model. For instance it could be located under the rear seat, or in the trunk, or the side of the dashboard.