Help please. I spent literal hours googling this, spent more than an hour in the junkyard pulling apart the dash (LAYERS of modules in there) of a willing sacrificial car, cannot seem to correctly use the search of this site (SURELY someone has asked this before), and yet cannot find where the BCM is on my gf'* car. Part no. is likely 10427827 (replaces 10419780). I usually use the diagrams....

On the Bonnevilles, the BCM is located underneath the dashboard passenger side. Drop the plastic kick panel and it should be tucked in up underneath.