Why a Seat Ibiza Replacement Key Won't Work
The Ibiza is now fitted with a brand new generation of driver assistance. Travel Assist makes sure your vehicle is keeping up with traffic movements while Lane Assist takes the worry out of changing lanes.
Take off the battery compartment cover on the key fob (A). With seat car key programmer , or flat-head screwdriver, pull upwards the cover and replace the CR2025 battery.

Dead Coin Battery
If your key fob isn't working but you're not successful in reprogramming it using an entirely new code, the most likely culprit is a dead coin battery. You can replace the battery yourself in less than ten minutes.
Flip the key open first from the side without the metal rings. You can remove the clip-on cover using your nail. The old battery is then pushed through the hole at the middle. Be careful: If you change the battery in a wrong way, or with a battery that is not suitable, it may harm the remote. Replace the battery with the same size, voltage, and specification as the original.
If your key fob was submerged in water, it may be necessary to clean the chip prior to replacing the battery. This is especially crucial if it was dropped into the sea, or soapy water. This should be done immediately, as exposure to water can harm the chip's electronic circuit and cause the key fob's functionality to cease.
Worn Buttons
Seat Ibiza keys stop working most often due to the battery that powers the coin is dead. It's a straightforward fix that will take only few minutes. The key fob can be inoperable if its buttons are worn. This is another fix, and requires you to swap the old key shell for an entirely new one.
It is essential to replace the button cell battery in a timely manner or the key fob might be damaged. It is recommended to always utilize a brand new battery that is the same size, voltage and specifications. It's also essential that the side of the new battery is directed upwards.
Rubber seals should keep water out of the key fob. Submerging the keyfob in water may cause the seals on the keyfobs to break, which could damage the electronic chip. This usually happens 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
Rubber seals on the key fob keep water from reaching the electronic chip. However, this doesn't stop the occasional splash. If your pet has been through a wash or a swim in the ocean it could have damaged the chip.
It is possible to fix this by removing the battery and cleaning the chip using isopropyl alcohol or electronic cleaner. Let it dry completely before placing it back. If the chip has become damaged, it will need to be replaced with a brand new one.
If your key fob isn't work despite changing the battery or reprogramming it, there could be a problem with the receiver module. This is the component in the car that receives signals from the key fob, and then sends them to the key ignition system. If you have a spare key fob, you can test it. The central locking should turn on and the ignition system light should turn on. If this does not happen, the receiver module is not working properly. This is a costly fix however, it can be fixed by a professional in your local garage.
Radio Interference
The receiver module on your key could cause interference. This can be fixed with a replacement key with a new receiver module purchased from Seat parts.
To replace the battery, flip off the key piece and then using your thumb nail or a screwdriver with a flat head, gently pull upwards the key fob battery compartment cover. Take off the old CR2025 and replace it with a new battery, making sure that the polarity is right. You can also use an ordinary key with a transponder chip which was before on a worn or damaged key. This can be coded, and cut to fit your car and, if required.
Faulty Receiver Module
The receiver module is the part in the key fob that transmits the radio signals to the car. If the fob stops working, it could be that the module has gone faulty. This can be identified using an OBDII scan device or by contacting the dealer.
Other devices that utilize the same frequency can interfere with the remote keyless entry system. This could include wireless phone transmitters, electronic devices, and even some household appliances.
If the key fob has been exposed to clean tap water, it may be possible to clean the chip using paper towels and isopropyl alcohol. If the key fob was submerged in soapy or salty water or sat for a long period of time on a damp surface, it is most likely to be damaged and need to be replaced.
To change the battery, use a small screwdriver with a flat head or a fingernail to pry open the compartment that houses the button cell batteries (B). Remove the old battery and then insert an CR2025 replacement battery, making sure that the "+" polarity is directed upwards.