WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: B+ Bus
Courtesy of GENERAL MOTORS CORP.
Fig 2: ABS 1, ABS 2, AUX PWR 1, AUX PWR 2, CNSTR VENT, CIGAR, CLSTR, PCM B, RDO, STOP, and TCCM Fuses