GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Yukon XL - 2WD 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Trailer Brake Control Schematics
Figure 1:

Trailer Brake Control System - E52
Object Number: 2098763 Size: FS
Figure 2:

Trailer Brake Control System - without E52
Object Number: 2098768 Size: FS