GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Transfer Case Control Schematics
Figure 1:

Power, Ground, Class 2 Serial Data, Transfer Case Shift Control Module and Transfer Case Encoder Motor
Object Number: 1645301 Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Transfer Case Shift Control Switch Inputs
Batteries - LG4/LG5 and B+ Bus
Ignition Switch - OFF/RUN/START, RUN/START, and START Bus Bars
Splice Pack SP203
G101 - 1 of 2
Figure 2:

Transfer Case Shift Control Switch Inputs
Object Number: 1827522 Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Power, Ground, Class 2 Serial Data, Transfer Case Shift Control Module and Transfer Case Encoder Motor
CTSY LAMPS, HVAC, ILLUM, LIGHTING, LT PARK, PRK LAMPS, and RT PARK Fuses/Circuit Breakers - 1 of 2
CTSY LAMPS, HVAC, ILLUM, LIGHTING, LT PARK, PRK LAMPS, and RT PARK Fuses/Circuit Breakers - 1 of 2
G103, G105, and G106