Buick LaCrosse: Erasing Universal Remote 
System Buttons - Universal Remote System Operation - Universal Remote System - Instruments and Controls - Buick LaCrosse Owners ManualBuick LaCrosse: Erasing Universal Remote System Buttons

All programmed buttons should be erased when the vehicle is sold or the lease ends.

To erase all programmed buttons on the Universal Remote system device:

1. Press and hold down the two outside buttons until the indicator light begins to flash.

This should take about 10 seconds.

2. Release both buttons.

    Using the Universal Remote System
    Press and hold the appropriate Universal Remote system button for at least half of a second. The indicator light will come on while the signal is being transmitted. ...

    Reprogramming a Single Universal Remote System Button
    To reprogram any of the three Universal Remote system buttons: 1. Press and hold the desired Universal Remote system button. Do not release the button. 2. The indicator light will begin to ...

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    Return to Factory Settings
    Select Return to Factory Settings to return all of the vehicle personalization to the default settings. Turn the Menu knob to select Yes or No. Press SELECT to confirm and go back to the l ...