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Key Fob Replacement for the Seat Ibiza The refreshed fifth-generation Ibiza is an option in the competitive supermini segment. It goes toe-to-toe with the Renault Clio, Peugeot 208 and Ford Fiesta. Using a thumb nail or small screwdriver with a flat head (A), prise upwards the key fob battery compartment cover (B). Replace the CR2025 coin battery, making sure it is in the correct direction and polarity. seat replacement car key for a key fob that does not lock or unlock your car is due to a dead coin battery. It usually shows warning signs prior to dying such as a decreased range or no power at all. It is simple to replace it with a brand new (CR2025) one from your local store. Be aware that using the wrong or unsuitable batteries could damage your key fob. Make sure that the battery you purchase is the same size, specification and voltage as the previous one. If your device was exposed to clean water, like rain or soapy tap water, it is possible that the electronic chip inside has been damaged by corrosion. You could try cleaning the chip using isopropyl alcohol or an electronic cleaner to try to see if this helps but it is likely the chip has been fried. The most efficient option is to buy a new key fob. Most major car dealers offer keys and can be installed by a seasoned mechanic. You can also purchase them online, like on eBay. It is recommended to work on a surface that has adequate lighting. It is easier to work with the smaller parts. This also helps you to avoid putting anything back in the wrong place. Always keep the key fob in a secure and safe location. Water Damage If your key fob gets damaged by dropping it in the pool or by slipping it in the washing machine you might think that it's gone but there's hope. When the circuit board in the fob is exposed to water, it becomes a conductor which shorts the components. It also accelerates corrosion and rust. Luckily, this is a simple issue to fix. Simply locate something absorbent and place it inside the fob – a paper towl or tissue can be used. Then, use a cotton swab dipped in isopropyl alcohol and wipe down the circuit board and other components to clean out any battery acid residue or contamination. Let the fob air dry in a dry, warm environment for a few weeks. After the fob has dried out it is time to replace the battery a new one (of the same size and the same polarity ('+' pointing upwards). The fob may be difficult to open in order to access the battery, but if you keep a flat-head screwdriver in your toolbox it should be easy to insert. Once the fob has been rebuilt, it should operate as normal. If it does not work, you may have to program it again or replace the module. Radio Interference When a key fob is working correctly, it sends the radio frequency signal which is received by the module inside your car. If the signal is interrupted the key fob will not function. This could be caused by weather conditions, objects or other transmitters operating on the same frequency close to your car. This can cause your key fob to not activate the vehicle's systems like the ignition switch or security system. It is recommended to replace your key fob's battery. A few LED lights that are aftermarket and uses the same frequency as the remote key fob may interfere with the signal and stop it from reaching the receiver modules. The LED lighting must be turned off or switched to a different frequency in order to keep out interference. If the problem persists after replacing the battery, the antenna on your key fob may be damaged or inoperable. This is important because the antenna is responsible for transmitting signals from the key fob to the receiver module. Utilizing an OBDII scanner will aid in diagnosing the issue by telling you what is 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 a receiver module that transmits signals for locking and unlocking. If this module fails and the on-board electronics will cease to function. If this happens Reprogramming using an OBDII scanner or replacing the key fob itself could help. This problem could be caused by a dead battery in the coin-cell or a water damage or signal interference. You can reset the onboard computer by disconnecting the 12 Volt batteries for 15 mins. This will remove any remaining electric current that could cause issues. Take the cable off first of the negative terminal, then the positive terminal. After 15 minutes, reconnect your battery in reverse order. First, positive and then negative second. Dirt or water can affect the internal chip inside the key fob. If your key fob stops working after being wet, wash it with isopropyl or electronics cleaner. Then reinstall the battery. If it stopped working after exposure to soapy or salty water the chip is likely fried and will need to be replaced. Another possibility is a damaged antenna module fuse that transmits the lock / unlock signal to the vehicle. The fuse can be located in a variety of locations, based on the model. For instance it could be beneath the rear seat, or in the trunk, or the side of the dashboard.