What are the functions of the 4-button key for the Buick Excelle?

[DelJaxon]

The functions of the Buick Excelle key are as follows: 1. There are a total of three function buttons. The button on the top left is for unlocking—pressing it will automatically unlock the doors. 2. The button on the top right is for locking—pressing it will lock all doors. 3. The button below is for the trunk switch—pressing it will automatically open the trunk slightly, allowing you to lift the trunk lid manually. 4. The silver button is for key ejection—pressing it will automatically pop out the mechanical key. The steps to replace the battery in the Buick Excelle key are as follows: 1. Eject the mechanical key by pressing the silver button at the top of the key. 2. Use a flathead screwdriver to pry open the key cover. 3. Once the cover is open, you will see the battery compartment—remove the old battery using the screwdriver. 4. Insert the new battery with the positive side facing up. 5. Reassemble the key cover and mechanical key. 6. Test the key by locking and unlocking to ensure the doors can be properly locked/unlocked.