GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Regal 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Object Detection Schematics
Figure 1:

Power, Ground, Serial Data and Switch
Object Number: 2180145 Size: FS
Figure 2:

Rear Object Sensors
Object Number: 2180146 Size: FS