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Why a Seat Ibiza Replacement Key Won't Work A newer generation of driver assist take the Ibiza to a new level. Travel Assist makes sure your vehicle is in sync with traffic flow while Lane Assist takes the worry out of changing lanes. Take off the battery compartment cover on the key fob (A). By using a flat-head screwdriver a thumb nail, push the cover upwards and replace the CR2025. Dead Coin Battery If your key fob stopped working and you're in a position to reprogram it using the latest code, the most likely cause is a dead coin battery. You can replace this battery yourself in less than 10 minutes. Open the key first from the side with no metal rings. There's a clip-on lid that you can lift open using your nail. The old battery is put through the hole in the middle. Note: Changing the battery improperly or using the wrong battery could cause damage to the remote key. Always replace the battery using one with the same voltage, size and specifications as the original. If your key fob was submerged in water, it may be necessary to clean the chip prior to replacing the battery. It's especially important if it was dropped into the sea, or soapy water. This should be taken care of immediately, as exposure to water could damage the electronic chip and cause your key fob to stop functioning. Worn Buttons Seat Ibiza keys stop working the majority of the time often because the coin battery is dead. This is not a problem and can be done in a couple of minutes. The key fob also stops functioning if the buttons are worn out. It's simple to fix and only requires you to replace the old key shell with the new one. It is important to remember that the button cell battery must be replaced properly or damage may occur to the key fob. It is recommended to always make sure you use a new battery of the exact size as well as the voltage, specifications, and size. It's also essential that the side of the new battery is facing upwards. Rubber seals are designed to keep water out of the key fob. Submerging the keyfob in water could cause the seals on the keyfobs to break, which could damage the electronic chip. This is usually the case if you accidentally drop your key fob in the pool or leave it in the rain. If your key fob still does not work after replacing it or reprogramming it, the receiver module could be faulty. Water Damage The key fob comes with rubber seals to stop water getting to the chip inside. However, this doesn't stop the occasional splash or bath. If you've made it through a washing cycle or an ocean swim your chip might be damaged. This can be resolved by removing the battery and cleaning the chip using isopropyl or electronic cleaner. Then let it dry completely before replacing it. If the chip is damaged, it will need to replace with a brand new one. If your key fob won't function after changing the battery or programming, the issue could be with the receiver module. It is the part inside the car that receives signals from the key fob and sends signals to the key ignition system. You can test it by trying the spare key fob if you have one. It should trigger the ignition system light come on and the central locking button activate. If this doesn't happen then the receiver module is not working properly. seat spare key is a cost-effective fix, but it can be done by a professional at your local garage. Radio Interference The receiver module inside your key could cause interference. Seat parts could provide an alternative key that comes with an entirely new receiver. To replace the battery, unplug the key and gently lift the cover of the key fob's battery compartment using your thumb or a screwdriver made of flat heads. Remove the old CR2025 battery and insert a new one, making sure it is in the proper the polarity. You can also make use of a standard key, with the transponder chip transferred from the damaged or worn key. This can be cut off and coded to your car if needed. Faulty Receiver Module The receiver module inside your key fob is what transmits radio signals to the car. If the fob isn't working it could be because the module has become defective. This can be identified using an OBDII scan tool or by contacting the dealer. The remote keyless entry system is vulnerable to interference from other devices operating at the same frequency. This could include mobile phones, electrical devices and even some household appliances. If the key fob is exposed clean tap water, it could be possible to clean the chip using paper towels and isopropyl alcohol. If the fob's electronic chip has been submerged in salty or soapy water or sat for a long period of time on a wet surface, it will almost certainly be damaged and must be replaced. To change the battery, use a small screwdriver with a flat head or a fingernail to pry open the compartment for button cell batteries (B). Remove the old battery, and replace it with a new CR2025 battery, making sure that the '+' polarity is facing upwards.