I wanted to take some time and spread some light on the information that has already been shared. I finally got around to ordering parts and just installed the switch.
As was already confirmed, the switch alone is bnot enough to turn off auto stop/start and the auto stop/start off button LED does not light up.
Nonetheless, I thought I'd share the process of swapping the "TOUR" button with the "
GS" button on the new switch and show some side by sides. For all photos, the original Buick switch is on top and the Opel switch is on bottom. Before disassembly:
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1) Remove the four screws on the back. I used a #1 Phillips:
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2) Pull the connector panel and circuit board out:
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3) Remove the button. There are two small tabs with rectangular slots on the button itself. These tabs lock onto two square post in the main switch body. All that's required to remove the button is to carefully bend these tabs out until they are no longer captured by the post.
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4) Now just swap the buttons, they snap right into place. All finished, no longer any blank buttons in this fully loaded GS:
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Everything that already existed on the car (GS, SPORT, LKA, and Park Assist) all function properly. Just no dice on the rest. Video for reference: