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Key Fob Replacement for the Seat Ibiza This fifth-generation Ibiza is revamped and is a contender in the supermini segment. It competes against 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 remove the battery compartment cover on the key fob (B). Replace seat keys by ensuring it is placed 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 a dead battery. After it has died you'll notice the decrease in range or no power. It is simple to replace it with a brand new (CR2025) one from your local supermarket. Be aware that incorrect or unsuitable batteries can damage the key fob. Make sure that the battery you replace is the same size and voltage as well as the same specification. If your fob was exposed to pure water, such as rainwater or soapy tap water It is probable that corrosion has caused damage to the electronic chip. You can clean the chip with isopropyl or electronic cleaners to determine if that helps, but the chip is damaged. A new key fob is a simple solution. They are available from most major car dealers and can be installed by a qualified mechanic. You can also buy them online, for example on eBay. It is recommended to work on a surface with good lighting. This will make it easier to work on the tiny parts inside. You will also be able to avoid placing something in the wrong place. Always keep your key fob in an area that is safe and secure. Water Damage If your key fob gets soaked by dropping it in the pool or slipping it in the washing machine, you may think it's a goner but there's a chance. When the circuit board in the fob is exposed to water, it develops a conductor which shorts the components. It also accelerates the process of rust and corrosion. This is an easy solution. Simply find something absorbent and put it inside the fob – paper towl or tissue is ideal. Then make use of an alcohol-soaked cotton swab and a cotton swab isopropyl alcohol and wipe down the circuit board and other components to remove any battery acid residue and contamination. Allow the circuit board to air dry in a warm, dry environment for a few weeks. Replace the battery once the fob is dry by a new one with the same dimensions and polarity ('+' (pointing upwards). It is a challenge to open the fob in order to access the battery, however if you have a small flat-head screwdriver available, it should be able to slide into easily. Once the fob is reassembled, it should work just as normal. If it doesn't, you might have to reprogramme it or replace the receiver module. Radio Interference If a key-fob is working correctly, it sends an audio frequency signal that is received by the module in your car. If the signal is interrupted, your key fob won't work. This could be due weather conditions, objects or other transmitters operating within the same frequency band close to your car. This could cause your key fob not to be able to trigger the car's systems such as the ignition switch or the security system. It is recommended to replace your key fob's battery. Some aftermarket LED lighting that utilizes the same frequency as the remote key fob may interfere with the signal and stop it from reaching the receiver modules. To prevent interference, the LED light must be switched off or switched to the opposite frequency. If the issue persists after installing a new battery, the antenna on your key fob could be damaged or is malfunctioning. The antenna is responsible for transmitting signals between the key fob and the receiver module. An OBDII scan will assist in diagnosing the issue by telling you exactly what's wrong with the system. The scanner will ask for information about your specific vehicle including the make and model of the vehicle, the type of engine, and VIN number. Faulty Receiver Module The key fob houses an electronic receiver that sends the signals for lock and unlock. All electronic components on board will cease functioning if this component has a problem. Reprogramming the key fob by an OBDII scan or replacing it could help. This issue can be caused by a dead coin-cell battery either from water damage or signal interference. You can reset the on-board computer by disconnecting the 12 Volt batteries for 15 minutes. This will remove any remaining electric current that could cause issues. Begin by removing your cable from the negative terminal of the battery first, followed by the positive terminal. After 15 minutes, reconnect the battery in reverse order first, positive second. The internal chip of the key fob may be damaged by dirt or water. If your key has stopped working after getting wet, clean the electronic component using isopropyl alcohol or an electronic cleaner prior to installing the battery. If the key stopped working after exposure to salted or soapy water, it is likely that the chip has been damaged and requires to be replaced. A damaged antenna module fuse could also be the reason. It is the fuse that transmits a signal to the vehicle to lock or unlock. Depending on the model the fuse could be located in one of several locations, such as the engine bay, side of the dashboard, under the rear seat, or in the trunk.