GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Denali 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 HVAC Schematics
Figure 1:

Module Power, Ground, Serial Data and Blower Controls
Object Number: 1844393 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Control Module References
Mode and Temperature Controls
ECM-BATT, HDLP WASH, HVAC BATT, IPC, LTR, S/ROOF and TCM-BATT Fuses
ABS-1, ABS-2, HEAVY DUTY ABS, HVAC BLWR, STUD 1, STUD 2 and WSW/HTR Fuses
Low Speed Bus - 1 of 3
Ignition III Voltage and Accessory Voltage
G201 2 of 2
G200 1 of 2
Figure 2:

Mode and Temperature Controls
Object Number: 1844394 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Control Module References
A/C Compressor Controls - C67
Module Power, Ground, Serial Data and Blower Controls
RUN/CRANK BUS - AUX HVAC- IGN and HVAC-IGN Fuses
G106 (4.3L) and G103
G102, G107 (4.3L), G104, G108
Figure 3:

A/C Compressor Controls - C67
Object Number: 1844392 Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Control Module References
Mode and Temperature Controls
A/C CMPRSR, FRT WASH, FUEL PUMP, HORN, HTD MIR, REAR DEFOG and STRTR Fuses
Low Speed Bus - 1 of 3
G106 (4.3L) and G103
G106 (4.3L) and G103
G102, G107 (4.3L), G104, G108