GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Power, Ground, and Transfer Case Shift Control Module


Object Number: 886858  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Class 2 Serial Data
B+ Bus Bar
INT BATT, PWR LKS, AMPF, CTSY LP and CIGAR LTR Fuses
G104 and G117
G104 and G117
G104 and G117
G104 and G117
G200, G201and G207-Pickup and Crew Cab
Figure 2:

Class 2 Serial Data


Object Number: 880149  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Power, Ground, and Transfer Case Shift Control Module
SIR Caution for Zoning