3 Common Reasons Why Your Seat Mii Replacement Key Isn't Working (And What You Can Do To Fix It) Key Fob Replacement for the Seat Ibiza

This fifth-generation Ibiza that has been redesignated is a contender for the supermini segment. It competes with Renault Clio and Peugeot 208 as well as the Ford Fiesta.

With a thumb nail or small screwdriver with a flat-headed head (A) to lift up the key fob compartment cover (B). Replace the CR2025 battery, making sure it is placed 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 a dead battery. It usually displays indications before it dies, like a lower range or no power at all. It is easy to replace it with a new (CR2025) one from a local retailer. Be aware that faulty or unsuitable batteries may damage the key fob. Be sure that the battery you choose to replace is the same size and voltage and that it is the same specifications.

If your fob was exposed to clean water such as rain or soapy tap water, it is likely that the electronic chip inside has been damaged by corrosion. You might try cleaning your chip with alcohol or an electronic cleaner to see if it helps but it is likely that the chip has fried.

The simplest solution is to get an entirely new key fob. Major car dealers sell them and they can be installed by a seasoned mechanic. You can also purchase them on the internet, for instance on eBay. It is best to work on a surface with good lighting. This will make it easier to work on small parts inside. This also helps you to avoid putting things back in the wrong place. Always keep the key fob in a secure and safe location.

Water Damage

If your key fob is soaked by dropping it in the pool or by slipping it in the wash you might think that it's lost but there's still hope. When the circuit board in the fob is exposed to water, it turns into a conductor that shorts out the components. It also speeds up the process of rust and corrosion.


Luckily, this is a simple issue to fix. Find something absorbent, and place it inside the fob - paper towl or tissue work well. Use a cotton swab that contains isopropyl for cleaning the circuit board and any other components. Allow the board to dry for several days in a warm and dry environment.

Replace the battery once the fob has dried with a fresh one with the same size and polarity ('+' (pointing upwards). The fob might be difficult to open to get to the battery, but should you have a flat-head screwdriver at hand it should be easy to slide in. After the fob is reassembled it should function like a normal. If it doesn't work, you'll require reprogramming it or replace the receiver module.

Radio Interference

If a key-fob is functioning correctly, it transmits a radio frequency signal, which is received by the module inside your car. However, if the signal is disrupted in any way the key fob will not work properly. This can be caused by objects, weather conditions, or other transmitters operating on the same frequency in close proximity to your car.

This could cause your key fob to not be able to activate the vehicle's systems, such as the ignition switch, or the security system. In this scenario it is best to replace the battery on your key fob.

Some LED lighting from the aftermarket that uses the same frequency as the remote key fob may interfere with the signal and block it from reaching the receiver modules. The LED's light source must be turned off or switched to a different frequency in order to avoid interference.

If you have a brand new battery in your key fob and the issue persists, it is possible that the antenna on the key fob is damaged or has stopped working. This is important since the antenna is responsible for sending an indication from the key fob to the receiver module. An OBDII scan will aid in diagnosing the issue by telling you exactly what's wrong with your system. The scanner will request details about your particular vehicle like the make and model of the vehicle, the type of engine, and VIN number.

The KeyLab has the receiver module which transmits the signals for lock and unlock. If the receiver module fails and the on-board electronic components will stop functioning. Reprogramming the key fob with an OBDII scan or replacing it might help.

This problem could be caused by a dead coin-cell battery or water damage, or signal interference. Try resetting the on-board computer by disconnecting the battery 12 volts for 15 minutes. This will remove any remaining electrical energy that could be causing problems. Begin by removing the cable from the negative terminal first, then the positive terminal. After 15 minutes, reconnect your battery in reverse order. First, positive, then negative, and finally negative.

The internal chip of the key fob could be damaged by dirt or water. If your key has stopped working after it got wet, wash the electronic component with isopropyl ethanol or an electronics cleaner before installing the battery. If your key has stopped working after being exposed to salted or soapy water, it is likely that the chip is damaged and needs to be replaced.

A damaged antenna module fuse may also be the cause. It's the fuse that sends an electronic signal to the vehicle to lock or unlock. The fuse may be located in a variety of locations, based on the model. For instance, it could be under the rear seat, or in the trunk, or on the side of the dashboard.