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TheKeyLab for the Seat Ibiza The facelifted fifth generation Ibiza is an option in the competitive supermini segment. It competes with the Renault Clio and Peugeot 208 as well as the Ford Fiesta. Use a small screwdriver or a thumbnail (A) to pry up the battery compartment cover on the key fob (B). Replace the CR2025 battery and ensure that it is inserted in the proper direction. Dead Coin Battery The most frequent reason for a key fob that does not be able to lock or unlock your car is due to a dead coin battery. It usually displays symptoms before it dies such as a decreasing range or no power at any time. It is easy to replace it with a new (CR2025) one from a local retailer. Be aware that incorrect or unsuitable batteries can damage the key fob. Make sure that the battery you purchase is identical in size, specifications and voltage as your old one. If your fob was exposed to clean water, such as rainwater or soapy water from the tap It is likely that corrosion has damaged the chip's electronic circuit. You could try cleaning the chip with isopropyl alcohol or an electronic cleaner to test if it helps, but it is likely that the chip has been fried. A new key fob is the simplest solution. Major car dealers sell them and they can be installed by an experienced mechanic. You can also purchase them online, such as on eBay. It is best to work on a surface that is equipped with good lighting. It makes it easier to work with small parts. You'll also be able to avoid placing things in the wrong spot. Always keep your key fob in a place that is secure and safe. Water Damage If your key fob is submerged after dropping it into the pool or by slipping it in the wash you might think it's a goner but there's still hope. When the circuit board inside the fob is exposed to water, it develops a conductor that shorts out the components. It also accelerates the process of rust and corrosion. Luckily, this is simple to fix. Find something absorbent to put inside the fob. A paper towel or tissue will be a good choice. Then you can use a cotton swab that has been soaked in isopropyl alcohol to clean the circuit board and other components to get rid of any battery acid residue and contamination. Allow the board to dry for some time in a dry, warm environment. Replace the battery when the fob has dried by replacing it with a new one that has the same dimensions and polarity ('+' (pointing upwards). The fob isn't easy opening to access the battery, but If you have a flat-head screwdriver in your toolbox it will be simple to insert. Once the fob is reassembled and working, it should operate as normal. If it doesn't, you might require reprogramming it or replace the receiver module. Radio Interference If a key-fob is functioning properly, it sends a radio frequency signal that is received by the module inside your car. If the signal is interrupted, your key fob will not function. This could be due to objects, weather conditions, or other transmitters that operate on the same frequency in close proximity to your car. This can cause your key fob to not be able to activate the vehicle's features, such as the ignition switch or the security system. In this scenario it's best to replace the battery in your key fob. A few LED lighting products which uses the same frequency as key fobs for remote control can interfere with the signal, stopping it from reaching receiver modules. To prevent interference, the LED lighting should be turned off or switched to the opposite frequency. If you have a brand new battery on your key fob but the issue persists, it is possible that the antenna on your key fob is damaged or not functioning properly. This is since the antenna is responsible for sending signals from the key fob to the receiver module. A scan of the OBDII can aid in diagnosing the issue by revealing what's wrong with the system. The scanner will request information about your specific vehicle, such as the make and model as well as the engine type and VIN number. Faulty Receiver Module The key fob comes with an electronic receiver that transmits signals for locking and unlocking. If this module is damaged that causes it to fail, the entire onboard electronics will stop working. Reprogramming the keyfob using an OBDII scan, or replacing it might help. This problem can be caused by a dead coin-cell or water damage, or signal interference. You can reset the on-board computer by disconnecting the 12 Volt batteries for 15 mins. This will drain any residual power that may be causing problems. The cable should be removed first from the negative terminal, then from the positive terminal. After 15 minutes, reconnect the battery in reverse order first: positive, then negative second. The internal chip inside the key fob could be damaged by water or dirt. If your key quit working after getting wet, clean the electronic component with isopropyl ethanol or an electronic cleaner prior to reinstalling the battery. If it stops working after exposure to salty or soapy water, the chip is probably damaged and needs to be replaced. A defective antenna module fuse may also be the cause. This is the fuse that transmits an alert to the vehicle to lock or unlock. Depending on the model the fuse can be located in one of the many locations including the engine bay, on the side of the dashboard, beneath the rear seat, or trunk.