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Key Fob Replacement for the Seat Ibiza The facelifted fifth generation Ibiza is an interesting contender in the supermini segment. It competes against 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 of the key fob (B). Replace the CR2025 batteries, making sure it is inserted in the correct direction. Dead Coin Battery The most frequent reason for a key fob to not be able to lock or unlock your car is a dead coin battery. It usually shows indications before it dies, like a lower range or no power at any time. It is easy to replace it with a fresh one (CR2025) from an area supermarket. Be aware that defective or unsuitable batteries may damage the key fob. Make sure that the new battery has the same size, specification and voltage as the previous one. If your fob was exposed to clean water like rain or soapy tap water it is likely that the electronic chip inside has been damaged by corrosion. You can clean the chip with isopropyl or electronic cleaners to see if it aids, but that the chip has been damaged. A new key fob is the simplest solution. Major car dealers sell keys and can be installed by an experienced mechanic. You can also buy them online, for example on eBay. It is recommended to work on a surface that is equipped with adequate lighting. It is much easier to work on small parts. You will also be able to avoid placing something in the wrong location. Always keep your key fob in a location that is secure and safe. Water Damage It's possible to think that your fob is lost if you drop it in the water or accidentally wash it. But there's a way to salvage it. When the circuit board on the fob is exposed to water, it develops a conductor that shorts out the components. It also speeds up corrosion and rust. This is an easy fix. Find something absorbent to put inside the fob. A tissue or a paper towel will be a good choice. Then you can 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 a few weeks. Once the fob is dried out and the battery is replaced with a new one of the same size and the same polarity ('+' pointing upwards). The fob can be difficult opening to access the battery, but If you have a flat-head screwdriver on hand, it should be easy to slide in. Once the fob is assembled, it should work like normal. If it doesn't, then you'll require reprogramming it or replace the receiver module. Radio Interference If a keyfob works properly, it sends out an audio frequency that is received by a module inside your car. If the signal is disrupted the key fob won't function. This could be caused by things, weather conditions or other transmitters operating within the same frequency band near your car. In seat car key battery replacement is recommended to replace the battery on your key fob. In this instance it is best to replace the battery inside your key fob. A few LED lighting aftermarkets that utilizes the same frequencies as a key fob for remote control may interfere with the signal, preventing it from reaching receiver modules. The LED's lighting needs to be switched off or changed to a different frequency in order to be able to avoid interference. If the issue is still present after replacing the battery, the antenna on the key fob might be damaged or is malfunctioning. The antenna is responsible for transmitting a signal between the key fob and the receiver module. Using an OBDII scanner can aid in diagnosing the issue by revealing what's wrong with the system. The scanner will request details about your particular vehicle including the make and model along with the engine type and VIN number. Faulty Receiver Module The key fob has the receiver module which transmits the signals to lock and unlock. If the receiver module fails that causes it to fail, the entire onboard electronics will cease to function. Reprogramming the keyfob using an OBDII scan or replacing it might help. There are a few possibilities for the cause of this problem, including an empty coin battery, water damage or signal interference. You can try resetting the computer on board by disconnecting the 12 volt battery for 15 minutes. This will eliminate any remaining electrical energy that could be causing issues. Start by removing the 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. Dirt and water can harm the internal chip of the key fob. If your key quit working when it was wet, you need to clean the electronic component using isopropyl alcohol or an electronic cleaner prior to installing the battery. If it has stopped working after exposure to salty or soapy water the chip is likely damaged and must be replaced. A faulty antenna module fuse could also be the cause. It's the fuse that transmits an alert to the vehicle to lock or unlock. Depending on your model, the fuse is located in a variety of locations including the engine bay, the side of the dashboard, under the rear seat, or trunk.